“时间之箭”的版本间的差异

2020年10月17日 (六) 16:01的版本

本词条由Agnes初步翻译

此词条暂由彩云小译翻译，未经人工整理和审校，带来阅读不便，请见谅。模板:Other uses

The arrow of time, also called time's arrow, is the concept positing the "one-way direction" or "asymmetry" of time. It was developed in 1927 by the British astrophysicist Arthur Eddington, and is an unsolved general physics question. This direction, according to Eddington, could be determined by studying the organization of atoms, molecules, and bodies, and might be drawn upon a four-dimensional relativistic map of the world ("a solid block of paper").引用错误：没有找到与</ref>对应的<ref>标签

|url=https://books.google.com/books?id=-R4ANHu-csMC}}, Chapter 4, p. 143</ref>

|url=https://books.google.com/books?id=-r4anhu-csMC}}, [ https://books.google.com/books?id=-r4anhu-csmc&pg=pa143第4章，p. 143]</ref>

Physical processes at the microscopic level are believed to be either entirely or mostly time-symmetric: if the direction of time were to reverse, the theoretical statements that describe them would remain true. Yet at the macroscopic level it often appears that this is not the case: there is an obvious direction (or flow) of time.

Physical processes at the microscopic level are believed to be either entirely or mostly time-symmetric: if the direction of time were to reverse, the theoretical statements that describe them would remain true. Yet at the macroscopic level it often appears that this is not the case: there is an obvious direction (or flow) of time.

人们通常认为，微观层面上的物理过程认为是全部或部分时间对称的: 如果时间的方向逆转，描述它们的理论仍然正确。然而，在宏观层面上，情况往往并非如此，时间存在明显的方向(或流动)。

Overview

概览

The symmetry of time (T-symmetry) can be understood simply as the following: if time were perfectly symmetrical, a video of real events would seem realistic whether played forwards or backwards.^[1] Gravity, for example, is a time-reversible force. A ball that is tossed up, slows to a stop, and falls is a case where recordings would look equally realistic forwards and backwards. The system is T-symmetrical. However, the process of the ball bouncing and eventually coming to a stop is not time-reversible. While going forward, kinetic energy is dissipated and entropy is increased. Entropy may be one of the few processes that is not time-reversible. According to the statistical notion of increasing entropy, the "arrow" of time is identified with a decrease of free energy.引用错误：没有找到与</ref>对应的<ref>标签

|doi=10.1098/rspa.2008.0494|bibcode = 2009RSPSA.465.1173T | doi-access=free }}</ref>

| doi 10.1098 / rspa. 2008.0494 | bibcode 2009RSPSA. 465.1173 t | doi-access free } / ref

Eddington

爱丁顿

In the 1928 book The Nature of the Physical World, which helped to popularize the concept, Eddington stated:

In the 1928 book The Nature of the Physical World, which helped to popularize the concept, Eddington stated:

在1928年出版的《物理世界的本质》一书中，爱丁顿推广了这个概念，他说:

Let us draw an arrow arbitrarily. If as we follow the arrow we find more and more of the random element in the state of the world, then the arrow is pointing towards the future; if the random element decreases the arrow points towards the past. That is the only distinction known to physics. This follows at once if our fundamental contention is admitted that the introduction of randomness is the only thing which cannot be undone. I shall use the phrase 'time's arrow' to express this one-way property of time which has no analogue in space.

“让我们任意画一个箭头。如果我们跟着箭头走，我们在世界的状态中发现越来越多的随机元素，那么箭头就指向未来; 如果随机元素减少了，那么箭头指向过去。这是物理学中已知的唯一区别。如果我们的基本论点得到承认，随机性的引入是唯一不可撤销的事情，那么这一点就立刻得到了证实。我会用“时间箭头”这个短语来表达时间的这种单向性质，这种性质在空间上没有类似的东西”

Eddington then gives three points to note about this arrow:

关于这个箭头，爱丁顿给出了三点注意事项:

It is vividly recognized by consciousness.

It is vividly recognized by consciousness.

它能通过意识被生动地认识到

It is equally insisted on by our reasoning faculty, which tells us that a reversal of the arrow would render the external world nonsensical.

It is equally insisted on by our reasoning faculty, which tells us that a reversal of the arrow would render the external world nonsensical.

我们的推理能力也同样坚持这一点，它告诉我们，箭头的反转会使外部世界变得荒谬。

It makes no appearance in physical science except in the study of organization of a number of individuals. (By which he means that it is only observed in entropy, a statistical mechanics phenomenon arising from a system.)

It makes no appearance in physical science except in the study of organization of a number of individuals. (By which he means that it is only observed in entropy, a statistical mechanics phenomenon arising from a system.)

除了研究一些个体的组织结构外，它在自然科学中没有出现。(他的意思是只有在熵中才能观察到，熵是一个系统产生的统计力学现象。

According to Eddington the arrow indicates the direction of progressive increase of the random element. Following a lengthy argument upon the nature of thermodynamics he concludes that, so far as physics is concerned, time's arrow is a property of entropy alone.

根据爱丁顿的说法，箭头表示随机元素逐渐增加的方向。在对热力学性质进行了长时间的争论之后，他得出结论，就物理学而言，时间之箭是只属于熵的属性。

Arrows

箭头

Thermodynamic arrow of time

热力学时间箭头

The arrow of time is the "one-way direction" or "asymmetry" of time. The thermodynamic arrow of time is provided by the second law of thermodynamics, which says that in an isolated system, entropy tends to increase with time. Entropy can be thought of as a measure of microscopic disorder; thus the second law implies that time is asymmetrical with respect to the amount of order in an isolated system: as a system advances through time, it becomes more statistically disordered. This asymmetry can be used empirically to distinguish between future and past, though measuring entropy does not accurately measure time. Also, in an open system, entropy can decrease with time.

时间之箭是指时间的“单向”或“不对称”。热力学的时间箭头是依据 热力学第二定律the second law of thermodynamics，在一个孤立的系统中，熵倾向于随着时间而增加。熵可以看作是一种对微观无序的度量; 因此，第二定律意味着在一个孤立的系统中，相对于有序的数量而言，时间是不对称的: 当一个系统随着时间推进时，它会变得更加无序。尽管测量熵并不能准确地测量时间，但这种不对称性可以用作区分未来和过去的经验。而且，在一个开放的系统中，熵会随着时间而减少。

British physicist Sir Alfred Brian Pippard wrote, "There is thus no justification for the view, often glibly repeated, that the Second Law of Thermodynamics is only statistically true, in the sense that microscopic violations repeatedly occur, but never violations of any serious magnitude. On the contrary, no evidence has ever been presented that the Second Law breaks down under any circumstances."^[2] However, there are a number of paradoxes regarding violation of the second law of thermodynamics, one of them due to the Poincaré recurrence theorem.

British physicist Sir Alfred Brian Pippard wrote, "There is thus no justification for the view, often glibly repeated, that the Second Law of Thermodynamics is only statistically true, in the sense that microscopic violations repeatedly occur, but never violations of any serious magnitude. On the contrary, no evidence has ever been presented that the Second Law breaks down under any circumstances." However, there are a number of paradoxes regarding violation of the second law of thermodynamics, one of them due to the Poincaré recurrence theorem.

英国物理学家阿尔弗雷德·布莱恩·派帕德爵士写道: “经常油嘴滑舌地重复的观点是没有依据的，尽管热力学第二定律理论只在统计学上是正确的，而在微观世界中的违反重复发生，但从未发生任何严重程度的违反。相反，从来没有任何证据表明第二定律在任何情况下失效。”然而，一些关于违反热力学第二定律的悖论的确存在，其中一个是由于庞加莱始态复现定理the Poincaré recurrence theorem。

This arrow of time seems to be related to all other arrows of time and arguably underlies some of them, with the exception of the weak arrow of time.模板:Clarification needed

This arrow of time seems to be related to all other arrows of time and arguably underlies some of them, with the exception of the weak arrow of time.

热力学时间之箭似乎与其他所有的时间之箭有关，并且可以说是其中一些之箭的基础，除了弱时间之箭之外。

Harold Blum's 1951 book Time's Arrow and Evolution^[3] "explored the relationship between time's arrow (the second law of thermodynamics) and organic evolution." This influential text explores "irreversibility and direction in evolution and order, negentropy, and evolution."^[4] Blum argues that evolution followed specific patterns predetermined by the inorganic nature of the earth and its thermodynamic processes.^[5]

Harold Blum's 1951 book Time's Arrow and Evolution "explored the relationship between time's arrow (the second law of thermodynamics) and organic evolution." This influential text explores "irreversibility and direction in evolution and order, negentropy, and evolution." Blum argues that evolution followed specific patterns predetermined by the inorganic nature of the earth and its thermodynamic processes.

哈罗德·布鲁姆（音译）在1951年出版的《时间之箭与进化》一书中“探索了时间之箭(热力学第二定律)与有机进化之间的关系。”这个有影响力的文本探索“不可逆性和方向的进化和秩序，负熵，和进化。”布鲁姆认为，进化遵循特定的模式，这种模式由地球的无机性质及其热力学过程预先确定。

Cosmological arrow of time

宇宙时间之箭

The cosmological arrow of time points in the direction of the universe's expansion. It may be linked to the thermodynamic arrow, with the universe heading towards a heat death (Big Chill) as the amount of usable energy becomes negligible. Alternatively, it may be an artifact of our place in the universe's evolution (see the Anthropic bias), with this arrow reversing as gravity pulls everything back into a Big Crunch.

The cosmological arrow of time points in the direction of the universe's expansion. It may be linked to the thermodynamic arrow, with the universe heading towards a heat death (Big Chill) as the amount of usable energy becomes negligible. Alternatively, it may be an artifact of our place in the universe's evolution (see the Anthropic bias), with this arrow reversing as gravity pulls everything back into a Big Crunch.

宇宙时间之箭The cosmological arrow of time指向宇宙膨胀的方向。它可能与热力学箭头有关，当可用能量变得微不足道时，宇宙正走向热死亡（ 大冷寂Big Chill）。或者，它可能是我们在宇宙演化中所处位置的人工制品(见 人择偏差the Anthropic bias) ，随着重力将一切拉回大坍缩，这个箭头发生了逆转。

If this arrow of time is related to the other arrows of time, then the future is by definition the direction towards which the universe becomes bigger. Thus, the universe expands—rather than shrinks—by definition.

If this arrow of time is related to the other arrows of time, then the future is by definition the direction towards which the universe becomes bigger. Thus, the universe expands—rather than shrinks—by definition.

如果这个 时间箭头arrow of time与时间的其他箭头相关，那么根据定义，未来宇宙将变得更大。因此，按照定义，宇宙是膨胀的，而不是缩小的。

The thermodynamic arrow of time and the second law of thermodynamics are thought to be a consequence of the initial conditions in the early universe.^[6] Therefore, they ultimately result from the cosmological set-up.

The thermodynamic arrow of time and the second law of thermodynamics are thought to be a consequence of the initial conditions in the early universe. Therefore, they ultimately result from the cosmological set-up.

热力学时间箭头The thermodynamicarrow of time和 热力学第二定律the second law of thermodynamics被视为宇宙早期初始条件下的结果。因此，最终她们是宇宙学的设置引发的。

Radiative arrow of time

辐射时间之箭

Waves, from radio waves to sound waves to those on a pond from throwing a stone, expand outward from their source, even though the wave equations accommodate solutions of convergent waves as well as radiative ones. This arrow has been reversed in carefully worked experiments that created convergent waves,^[7] so this arrow probably follows from the thermodynamic arrow in that meeting the conditions to produce a convergent wave requires more order than the conditions for a radiative wave. Put differently, the probability for initial conditions that produce a convergent wave is much lower than the probability for initial conditions that produce a radiative wave. In fact, normally a radiative wave increases entropy, while a convergent wave decreases it,^{[citation needed]} making the latter contradictory to the second law of thermodynamics in usual circumstances.

Waves, from radio waves to sound waves to those on a pond from throwing a stone, expand outward from their source, even though the wave equations accommodate solutions of convergent waves as well as radiative ones. This arrow has been reversed in carefully worked experiments that created convergent waves, so this arrow probably follows from the thermodynamic arrow in that meeting the conditions to produce a convergent wave requires more order than the conditions for a radiative wave. Put differently, the probability for initial conditions that produce a convergent wave is much lower than the probability for initial conditions that produce a radiative wave. In fact, normally a radiative wave increases entropy, while a convergent wave decreases it, making the latter contradictory to the second law of thermodynamics in usual circumstances.

虽然波动方程包含了会聚波和辐射波的解，但所有的波，从无线电波到声波，再到石头扔进池塘里产生的波，都是从源头向外扩展。这个方向在精心设计的产生收敛波的实验中被颠倒过来，所以这个方向可能来自热力学方向，因为满足产生收敛波的条件比产生辐射波的条件需要更多的次序。换句话说，产生会聚波初始条件的概率远低于产生辐射波初始条件的概率。事实上，正常情况下，辐射波会增加熵，而会聚波会减少熵，使后者在通常情况下与热力学第二定律相矛盾。

Causal arrow of time

因果时间箭头

A cause precedes its effect: the causal event occurs before the event it causes or affects. Birth, for example, follows a successful conception and not vice versa. Thus causality is intimately bound up with time's arrow.

原因先于结果: 因果事件发生在它引起或影响的事件之前。例如，出生遵循一个成功的概念，而不是相反。因此，因果关系与时间之箭密切相关。

An epistemological problem with using causality as an arrow of time is that, as David Hume maintained, the causal relation per se cannot be perceived; one only perceives sequences of events. Furthermore, it is surprisingly difficult to provide a clear explanation of what the terms cause and effect really mean, or to define the events to which they refer. However, it does seem evident that dropping a cup of water is a cause while the cup subsequently shattering and spilling the water is the effect.

用因果关系作为时间箭头的认识论问题在于，正如大卫 · 休谟所坚持的那样，因果关系本身不能被感知; 人们只能感知事件的序列。此外，要对因果这两个术语的真正含义提供一个清晰的解释，或者定义它们所指的事件，是非常困难的。然而，看起来很明显，掉落一杯水是一个原因，而杯子随后粉碎和溢出的水是影响。

Physically speaking, the perception of cause and effect in the dropped cup example is a phenomenon of the thermodynamic arrow of time, a consequence of the second law of thermodynamics.^[8] Controlling the future, or causing something to happen, creates correlations between the doer and the effect,^[9] and these can only be created as we move forwards in time, not backwards.

Physically speaking, the perception of cause and effect in the dropped cup example is a phenomenon of the thermodynamic arrow of time, a consequence of the second law of thermodynamics. Controlling the future, or causing something to happen, creates correlations between the doer and the effect, and these can only be created as we move forwards in time, not backwards.

从物理学上讲，杯子掉落的例子中对因果关系的感知是一种热力学时间箭头的现象，是热力学第二定律的结果。控制未来，或者导致某些事情发生，会在行动者和结果之间建立相关性，而这些相关性只能在我们向前推进的时候产生，而不是向后。

Particle physics (weak) arrow of time

粒子物理学(弱)时间之箭

Certain subatomic interactions involving the weak nuclear force violate the conservation of both parity and charge conjugation, but only very rarely. An example is the kaon decay.^[10] According to the CPT theorem, this means they should also be time irreversible, and so establish an arrow of time. Such processes should be responsible for matter creation in the early universe.

Certain subatomic interactions involving the weak nuclear force violate the conservation of both parity and charge conjugation, but only very rarely. An example is the kaon decay. According to the CPT theorem, this means they should also be time irreversible, and so establish an arrow of time. Such processes should be responsible for matter creation in the early universe.

某些涉及弱核力的亚原子相互作用违反了宇称守恒和电荷共轭守恒，但这种情况很少发生。一个例子是 kaon 衰变。根据 CPT 定理，这意味着它们也应该是时间不可逆的，因此建立了一个时间箭头。这样的过程应该对早期宇宙中物质的产生负责。

That the combination of parity and charge conjugation is broken so rarely means that this arrow only "barely" points in one direction, setting it apart from the other arrows whose direction is much more obvious. This arrow had not been linked to any large scale temporal behaviour until the work of Joan Vaccaro, who showed that T violation could be responsible for conservation laws and dynamics.^[11]

That the combination of parity and charge conjugation is broken so rarely means that this arrow only "barely" points in one direction, setting it apart from the other arrows whose direction is much more obvious. This arrow had not been linked to any large scale temporal behaviour until the work of Joan Vaccaro, who showed that T violation could be responsible for conservation laws and dynamics.

奇偶性和电荷共轭的结合很少被破坏，这意味着这个箭头仅仅“勉强”指向一个方向，使它有别于其他方向更明显的箭头。直到 Joan Vaccaro 的工作，这个箭头才被与任何大规模的时间行为联系起来，他的工作表明 t 的违反可能是守恒定律和动力学的原因。

Quantum arrow of time

时间的量子箭头

模板:Unsolved

According to the Copenhagen interpretation of quantum mechanics, quantum evolution is governed by the Schrödinger equation, which is time-symmetric, and by wave function collapse, which is time irreversible. As the mechanism of wave function collapse is philosophically obscure, it is not completely clear how this arrow links to the others. Despite the post-measurement state being entirely stochastic in formulations of quantum mechanics, a link to the thermodynamic arrow has been proposed, noting that the second law of thermodynamics amounts to an observation that nature shows a bias for collapsing wave functions into higher entropy states versus lower ones, and the claim that this is merely due to more possible states being high entropy runs afoul of Loschmidt's paradox. According to one physical view of wave function collapse, the theory of quantum decoherence, the quantum arrow of time is a consequence of the thermodynamic arrow of time.^{[citation needed]}

According to the Copenhagen interpretation of quantum mechanics, quantum evolution is governed by the Schrödinger equation, which is time-symmetric, and by wave function collapse, which is time irreversible. As the mechanism of wave function collapse is philosophically obscure, it is not completely clear how this arrow links to the others. Despite the post-measurement state being entirely stochastic in formulations of quantum mechanics, a link to the thermodynamic arrow has been proposed, noting that the second law of thermodynamics amounts to an observation that nature shows a bias for collapsing wave functions into higher entropy states versus lower ones, and the claim that this is merely due to more possible states being high entropy runs afoul of Loschmidt's paradox. According to one physical view of wave function collapse, the theory of quantum decoherence, the quantum arrow of time is a consequence of the thermodynamic arrow of time.

根据哥本哈根诠释的量子力学，量子进化是由时间对称的薛定谔方程和不可逆的波函数崩溃控制的。由于波函数崩塌的机制在哲学上是模糊的，所以我们并不完全清楚这个箭头是如何与其他箭头联系起来的。尽管在量子力学的公式中，测量后的状态是完全随机的，但是与热力学箭头的联系已经被提出，注意到热力学第二定律相当于一个观察，自然表现出一种倾向，倾向于坍缩波函数到更高的熵状态而不是更低的熵状态，而声称这仅仅是由于更多的可能状态是高熵状态与 Loschmidt 的悖论相冲突。根据波函数坍缩的一个物理观点---- 量子退相干理论，时间的量子箭头是热力学时间箭头的结果。

Relational quantum mechanics proposes that there is no such thing as an absolute wave function collapse, and that what an observer sees as wave function collapse is in fact the observer becoming entangled with the measured state. The thermodynamic arrow is an increase in entanglement over time; in this way, relational quantum mechanics relates the quantum arrow to the thermodynamic arrow.

关系性量子力学提出，绝对波函数崩溃是不存在的，观察者所看到的波函数崩溃实际上是观察者与被测量的状态纠缠在一起。热力学箭头是纠缠随着时间的推移而增加; 通过这种方式，关系性量子力学将量子箭头与热力学箭头联系起来。

In 2019, a team of Russian scientists reported the reversal of the quantum arrow of time on an IBM quantum computer.^[12] By observing the state of the quantum computer made of two and later three superconducting qubits, they found that in 85% of the cases, the two-qubit computer returned into the initial state.^[13] The state's reversal was made by a special program, similarly to the random microwave background fluctuation in the case of the electron.^[13] However, according to the estimations, throughout the age of the universe (13.7 billion years) such a reversal of the electron's state would only happen once, for 0.06 nanoseconds.^[13] The scientists' experiment led to the possibility of a quantum algorithm that reverses a given quantum state through complex conjugation.^[12]

In 2019, a team of Russian scientists reported the reversal of the quantum arrow of time on an IBM quantum computer. By observing the state of the quantum computer made of two and later three superconducting qubits, they found that in 85% of the cases, the two-qubit computer returned into the initial state. The state's reversal was made by a special program, similarly to the random microwave background fluctuation in the case of the electron. However, according to the estimations, throughout the age of the universe (13.7 billion years) such a reversal of the electron's state would only happen once, for 0.06 nanoseconds. The scientists' experiment led to the possibility of a quantum algorithm that reverses a given quantum state through complex conjugation.

2019年，一组俄罗斯科学家报告了 IBM 量子计算机上时间量子箭头的反转。通过观察由两个或三个超导量子位组成的量子计算机的状态，他们发现在85% 的情况下，两个量子位的计算机返回到初始状态。这种状态的反转是通过一个特殊的程序实现的，类似于电子的随机微波背景起伏。然而，根据估计，在整个宇宙的年龄(137亿年) ，这种电子状态的逆转只会发生一次，持续0.06纳秒。科学家们的实验导致了通过复杂共轭反转给定量子态的量子算法的可能性。

Quantum source of time

时间的量子源

Physicists say that quantum uncertainty gives rise to entanglement, the putative source of the arrow of time.^{[citation needed]} The idea that entanglement might explain the arrow of time was proposed by Seth Lloyd in the 1980s. Lloyd argues that quantum uncertainty, and the way it spreads as particles become increasingly entangled, could replace human uncertainty in the old classical proofs as the true source of the arrow of time. According to Lloyd, "The arrow of time is an arrow of increasing correlations."^[14]

Physicists say that quantum uncertainty gives rise to entanglement, the putative source of the arrow of time. The idea that entanglement might explain the arrow of time was proposed by Seth Lloyd in the 1980s. Lloyd argues that quantum uncertainty, and the way it spreads as particles become increasingly entangled, could replace human uncertainty in the old classical proofs as the true source of the arrow of time. According to Lloyd, "The arrow of time is an arrow of increasing correlations."

物理学家说量子不确定性引起了纠缠，假定的时间之箭的来源。纠缠可能解释时间之箭的想法是由 Seth Lloyd 在20世纪80年代提出的。劳埃德认为，量子不确定性，以及它随着粒子变得越来越纠缠而扩散的方式，可以取代古老的经典证明中人类的不确定性，成为时间之箭的真正来源。按照劳埃德的说法，“时间之箭是一个增加相关性的箭头。”

Psychological/perceptual arrow of time

心理学 / 感知时间之箭

A related mental arrow arises because one has the sense that one's perception is a continuous movement from the known (past) to the unknown (future). Anticipating the unknown forms the psychological future, which always seems to be something one is moving towards. However, like a projection in a mirror, it makes what is actually already a part of memory, such as desires, dreams, and hopes, seem ahead of the observer.

一个相关的精神箭头的出现是因为一个人的感知是一个从已知(过去)到未知(未来)的连续运动。期待未知的形式是心理学的未来，这似乎总是一个人正在走向的东西。然而，就像镜子里的投影一样，它使实际上已经是记忆的一部分的东西，比如欲望、梦想和希望，看起来超越了观察者。

The association of "behind ⇔ past" and "ahead ⇔ future" is itself culturally determined. For example, the Aymara language associates "ahead ⇔ past" and "behind ⇔ future".^[15]^[16] Similarly, the Chinese term for "the day after tomorrow" 後天 ("hòu tiān") literally means "after (or behind) day", whereas "the day before yesterday" 前天 ("qián tiān") is literally "preceding (or in front) day."^[17]

The association of "behind ⇔ past" and "ahead ⇔ future" is itself culturally determined. For example, the Aymara language associates "ahead ⇔ past" and "behind ⇔ future". Similarly, the Chinese term for "the day after tomorrow" 後天 ("hòu tiān") literally means "after (or behind) day", whereas "the day before yesterday" 前天 ("qián tiān") is literally "preceding (or in front) day."

”过去之后”和”未来之前”的联系本身是由文化决定的。例如，艾马拉语将“ ahead something past”和“ behind something future”联系起来。Similarly, the Chinese term for "the day after tomorrow" 後天 ("hòu tiān") literally means "after (or behind) day", whereas "the day before yesterday" 前天 ("qián tiān") is literally "preceding (or in front) day."

The words "yesterday" and "tomorrow" both translate to the same word in Hindi: कल ("kal"),^[18] meaning "[one] day remote from today."^[19] The ambiguity is resolved by verb tense. परसों ("parsoⁿ") is used for both "day before yesterday" and "day after tomorrow", or "two days from today".^[20] नरसों ("narsoⁿ") is used for "three days from today."^[21]

The words "yesterday" and "tomorrow" both translate to the same word in Hindi: कल ("kal"), meaning "[one] day remote from today." The ambiguity is resolved by verb tense. परसों ("parsoⁿ") is used for both "day before yesterday" and "day after tomorrow", or "two days from today". नरसों ("narsoⁿ") is used for "three days from today."

“昨天”和“明天”这两个词在印地语中翻译成同一个词: something (“ kal”) ，意思是“离今天还有一天”歧义是通过动词时态来解决的。Something something something something something (“ parson”)既用于“前天” ，也用于“后天” ，或“从今天起两天”。“ narson”是“三天后”的意思

The other side of the psychological passage of time is in the realm of volition and action. We plan and often execute actions intended to affect the course of events in the future. From the Rubaiyat:

心理上的时间流逝的另一面是意志和行动的领域。我们计划并经常执行旨在影响未来事件进程的行动。来自鲁拜集团:

块引号
<poem>
<poem>
诗
The Moving Finger writes; and, having writ,
The Moving Finger writes; and, having writ,
移动的手指写道,
Moves on: nor all thy Piety nor Wit
Moves on: nor all thy Piety nor Wit
继续前行，不再有你的虔诚和智慧
Shall lure it back to cancel half a Line,
Shall lure it back to cancel half a Line,
将引诱它回来取消半行,
Nor all thy Tears wash out a Word of it.
Nor all thy Tears wash out a Word of it.
你的眼泪也不能洗去一句话。
</poem>
</poem>
/ 诗歌
— Omar Khayyám (translation by Edward Fitzgerald).
— Omar Khayyám (translation by Edward Fitzgerald).
— Omar Khayyám (翻译: 爱德华·菲茨杰拉德)。

References

参考资料

↑ David Albert on Time and Chance
↑ A. B. Pippard, Elements of Chemical Thermodynamics for Advanced Students of Physics (1966), p.100.
↑ Blum, Harold F. (1951). Time's Arrow and Evolution (First ed.). ISBN 978-0-691-02354-0. https://books.google.com/books?id=tmcNnwEACAAJ.
↑ Morowitz, Harold J. (September 1969). "Book review: Time's arrow and evolution: Third Edition". Icarus. 11 (2): 278–279. Bibcode:1969Icar...11..278M. doi:10.1016/0019-1035(69)90059-1. PMC 2599115.
↑ McN., W. P. (November 1951). "Book reviews: Time's Arrow and Evolution". Yale Journal of Biology and Medicine. 24 (2): 164. PMC 2599115.
↑ Susskind, Leonard. "Boltzmann and the Arrow of Time: A Recent Perspective". Cornell University. Cornell University. Retrieved June 1, 2016.
↑ Mathias Fink (30 November 1999). "Time-Reversed Acoustic" (PDF). Archived from the original (PDF) on 31 December 2005. Retrieved 27 May 2016.
↑ Physical Origins of Time Asymmetry, chapter 6
↑ Physical Origins of Time Asymmetry, pp. 109–111.
↑ "Home". Physics World.
↑ Vaccaro, Joan (2016). "Quantum asymmetry between time and space". Proceedings of the Royal Society A. 472 (2185): 20150670. arXiv:1502.04012. Bibcode:2016RSPSA.47250670V. doi:10.1098/rspa.2015.0670. PMC 4786044. PMID 26997899.
↑ ^12.0 ^12.1 G. B. Lesovik, I. A. Sadovskyy, M. V. Suslov, A. V. Lebedev, V. M. Vinokur (13 March 2019). "Arrow of time and its reversal on the IBM quantum computer". Nature. 9. arXiv:1712.10057. doi:10.1038/s41598-019-40765-6.{{cite journal}}: CS1 maint: uses authors parameter (link)
↑ ^13.0 ^13.1 ^13.2 "Physicists reverse time using quantum computer". Phys.org. 13 March 2019. Retrieved 13 March 2019.
↑ Wolchover, Natalie (25 April 2014). "New Quantum Theory Could Explain the Flow of Time" – via www.wired.com.
↑ For Andes tribe, it's back to the future — accessed 2006-09-26
↑ Núñez Rafael E., Sweetser Eve. "With the Future Behind Them: Convergent Evidence From Aymara Language and Gesture in the Crosslinguistic Comparison of Spatial Construals of Time" (PDF). Department of Cognitive Science, University of California at San Diego. Retrieved 8 March 2020.{{cite web}}: CS1 maint: url-status (link)
↑ mbdg.net Chinese-English Dictionary — accessed 2017-01-11
↑ Bahri, Hardev (1989). Learners' Hindi-English Dictionary. Delhi: Rajpal & Sons. p. 95. ISBN 978-81-7028-002-6.
↑ Alexiadou, Artemis (1997). Adverb placement : a case study in antisymmetric syntax. Amsterdam [u.a.]: Benjamins. p. 108. ISBN 978-90-272-2739-3.
↑ Hindi-English.org Hindi English Dictionary परसों — accessed 2017-01-11
↑ Shabdkosk.Raftaar.in Hindi English Dictionary नरसों — accessed 2017-01-11

External links

外部链接

The Ritz-Einstein Agreement to Disagree, a review of historical perspectives of the subject, prior to the evolvement of quantum field theory.

The Thermodynamic Arrow: Puzzles and Pseudo-Puzzles Huw Price on Time's Arrow

Arrow of time in a discrete toy model

The Arrow of Time

Why Does Time Run Only Forwards, by Adam Becker, bbc.com.

编辑推荐

模板:Time Topics

Category:Asymmetry

分类: 不对称

Category:Concepts in physics

分类: 物理概念

Category:Non-equilibrium thermodynamics

类别: 非平衡态热力学

Category:Philosophical analogies

范畴: 哲学类比

Category:Philosophy of thermal and statistical physics

类别: 热力学和统计物理学哲学

Category:Philosophy of time

类别: 时间哲学

Category:Time in physics

分类: 物理时间

This page was moved from wikipedia:en:Arrow of time. Its edit history can be viewed at 时间之箭/edithistory

[1] David Albert on Time and Chance

[2] A. B. Pippard, Elements of Chemical Thermodynamics for Advanced Students of Physics (1966), p.100.

[Blum1951-3] Blum, Harold F. (1951). Time's Arrow and Evolution (First ed.). ISBN 978-0-691-02354-0. https://books.google.com/books?id=tmcNnwEACAAJ.

[arrow-review-4] Morowitz, Harold J. (September 1969). "Book review: Time's arrow and evolution: Third Edition". Icarus. 11 (2): 278–279. Bibcode:1969Icar...11..278M. doi:10.1016/0019-1035(69)90059-1. PMC 2599115.

[yale-5] McN., W. P. (November 1951). "Book reviews: Time's Arrow and Evolution". Yale Journal of Biology and Medicine. 24 (2): 164. PMC 2599115.

[6] Susskind, Leonard. "Boltzmann and the Arrow of Time: A Recent Perspective". Cornell University. Cornell University. Retrieved June 1, 2016.

[7] Mathias Fink (30 November 1999). "Time-Reversed Acoustic" (PDF). Archived from the original (PDF) on 31 December 2005. Retrieved 27 May 2016.

[8] Physical Origins of Time Asymmetry, chapter 6

[9] Physical Origins of Time Asymmetry, pp. 109–111.

[10] "Home". Physics World.

[11] Vaccaro, Joan (2016). "Quantum asymmetry between time and space". Proceedings of the Royal Society A. 472 (2185): 20150670. arXiv:1502.04012. Bibcode:2016RSPSA.47250670V. doi:10.1098/rspa.2015.0670. PMC 4786044. PMID 26997899.

[nature-12] 12.0 ^12.1 G. B. Lesovik, I. A. Sadovskyy, M. V. Suslov, A. V. Lebedev, V. M. Vinokur (13 March 2019). "Arrow of time and its reversal on the IBM quantum computer". Nature. 9. arXiv:1712.10057. doi:10.1038/s41598-019-40765-6.{{cite journal}}: CS1 maint: uses authors parameter (link)

[phys-13] 13.0 ^13.1 ^13.2 "Physicists reverse time using quantum computer". Phys.org. 13 March 2019. Retrieved 13 March 2019.

[14] Wolchover, Natalie (25 April 2014). "New Quantum Theory Could Explain the Flow of Time" – via www.wired.com.

[15] For Andes tribe, it's back to the future — accessed 2006-09-26

[16] Núñez Rafael E., Sweetser Eve. "With the Future Behind Them: Convergent Evidence From Aymara Language and Gesture in the Crosslinguistic Comparison of Spatial Construals of Time" (PDF). Department of Cognitive Science, University of California at San Diego. Retrieved 8 March 2020.{{cite web}}: CS1 maint: url-status (link)

[17] .net Chinese-English Dictionary — accessed 2017-01-11

[18] Bahri, Hardev (1989). Learners' Hindi-English Dictionary. Delhi: Rajpal & Sons. p. 95. ISBN 978-81-7028-002-6.

[19] Alexiadou, Artemis (1997). Adverb placement : a case study in antisymmetric syntax. Amsterdam [u.a.]: Benjamins. p. 108. ISBN 978-90-272-2739-3.

[20] Hindi-English.org Hindi English Dictionary परसों — accessed 2017-01-11

[21] Shabdkosk.Raftaar.in Hindi English Dictionary नरसों — accessed 2017-01-11

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

[11]

[12]

[13]

[14]

[15]

[16]

[17]

[18]

[19]

[20]

[21]

@@ 第16行： / 第16行： @@
 The arrow of time, also called time's arrow, is the concept positing the "one-way direction" or "asymmetry" of time. It was developed in 1927 by the British astrophysicist Arthur Eddington, and is an unsolved general physics question. This direction, according to Eddington, could be determined by studying the organization of atoms, molecules, and bodies, and might be drawn upon a four-dimensional relativistic map of the world ("a solid block of paper").
-'''<font color="#ff8000"> 时间之箭The arrow of time</font>'''，是一种概念，假定时间是“单向方向”或“不对称”的。此概念于1927年由英国天体物理学家亚瑟·爱丁顿提出的一个普通物理学问题，至今尚未解决。按照爱丁顿的说法，研究原子、分子和物体的组织可以确定时间的方向，也可以绘制在一张四维的相对论世界地图上(“一整块纸”)。
+'''<font color="#ff8000"> 时间之箭The arrow of time</font>'''是一种概念，假定时间是“单向方向”或“不对称”的。此概念于1927年由英国天体物理学家亚瑟·爱丁顿提出的一个普通物理学问题，至今尚未解决。按照爱丁顿的说法，研究原子、分子和物体的组织可以确定时间的方向，也可以绘制在一张四维的相对论世界地图上(“一整块纸”)。
 <ref>{{cite book|title=The scientist as philosopher: philosophical consequences of great scientific discoveries
@@ 第22行： / 第22行： @@
 <ref>{{cite book|title=The scientist as philosopher: philosophical consequences of great scientific discoveries
-【The scientist as philosopher: philosophical consequences of great scientific discoveries作为哲学家的科学家: 伟大科学发现的哲学后果】
+【书籍：The scientist as philosopher: philosophical consequences of great scientific discoveries《作为哲学家的科学家: 伟大科学发现的哲学后果》】
 |first1=Friedel
@@ 第91行： / 第91行： @@
 The symmetry of time (T-symmetry) can be understood simply as the following: if time were perfectly symmetrical, a video of real events would seem realistic whether played forwards or backwards. Gravity, for example, is a time-reversible force. A ball that is tossed up, slows to a stop, and falls is a case where recordings would look equally realistic forwards and backwards. The system is T-symmetrical. However, the process of the ball bouncing and eventually coming to a stop is not time-reversible. While going forward, kinetic energy is dissipated and entropy is increased. Entropy may be one of the few processes that is not time-reversible. According to the statistical notion of increasing entropy, the "arrow" of time is identified with a decrease of free energy.<ref>{{cite journal
-时间的对称性(t 对称性)可以简单地理解为: 如果时间是完全对称的，那么一段真实事件的视频，无论播放多长前后，都会显得很真实。例如，重力是一种时间可逆的力。一个球被抛起，减速到停止，然后下降的情况下，录音将看起来同样现实的前进和后退。系统为 t 型对称系统。然而，球反弹并最终停止的过程是不可逆的。在前进过程中，动能耗散，熵增加。熵可能是少数几个不可逆的过程之一。根据熵增的统计概念，时间的“箭头”被确定为自由能的减少。 文献{ cite journal
+'''<font color="#ff8000"> 时间对称性The symmetry of time</font>'''可以简单地理解为: 如果时间是完全对称的，那么一段真实事件的视频，无论从前往后播放还是从后往前播放，都会显得很真实。例如，重力是一种时间可逆的力。一个球被抛起，减速到停止，然后下降，在这种情况下正放和倒放看起来同样真实。该系统具有'''<font color="#ff8000"> 时间对称性The symmetry of time</font>'''。然而，球反弹并最终停止的过程是不可逆的。在前进过程中，动能耗散，熵增加。熵可能是少数几个处于时间不可逆的过程之一。根据熵增的统计概念，时间的“箭头”被确定为自由能的减少。
-| author=Tuisku, P. |author2=Pernu, T.K. |author3=Annila, A. | title=In the light of time
+<ref>{{cite journal| author=Tuisku, P. |author2=Pernu, T.K. |author3=Annila, A. | title=In the light of time
-| author=Tuisku, P. |author2=Pernu, T.K. |author3=Annila, A. | title=In the light of time
+<ref>{{cite journal| author=Tuisku, P. |author2=Pernu, T.K. |author3=Annila, A. | title=In the light of time
-Pernu，t.k.3 Annila，a.在时间的光芒下
+【文献：柏鲁（音译），柏鲁·T.K.，安尼利亚（音译）·A.《时间的道理》】
 | journal=Proceedings of the Royal Society A | volume=465 |issue=2104 | pages=1173–1198 | year=2009
 | journal=Proceedings of the Royal Society A | volume=465 |issue=2104 | pages=1173–1198 | year=2009
-年11月17日，《皇家学会报告志 a 辑第465卷第2104期
+年11月17日，《皇家学会学报》 A 辑第465卷第2104期
 |doi=10.1098/rspa.2008.0494|bibcode = 2009RSPSA.465.1173T | doi-access=free }}</ref>
@@ 第126行： / 第125行： @@
 在1928年出版的《物理世界的本质》一书中，爱丁顿推广了这个概念，他说:
 <blockquote>Let us draw an arrow arbitrarily. If as we follow the arrow we find more and more of the random element in the state of the world, then the arrow is pointing towards the future; if the random element decreases the arrow points towards the past. That is the only distinction known to [[physics]]. This follows at once if our fundamental contention is admitted that the introduction of randomness is the only thing which cannot be undone. I shall use the phrase 'time's arrow' to express this one-way property of time which has no analogue in space.</blockquote>
@@ 第135行： / 第130行： @@
 <blockquote>Let us draw an arrow arbitrarily. If as we follow the arrow we find more and more of the random element in the state of the world, then the arrow is pointing towards the future; if the random element decreases the arrow points towards the past. That is the only distinction known to physics. This follows at once if our fundamental contention is admitted that the introduction of randomness is the only thing which cannot be undone. I shall use the phrase 'time's arrow' to express this one-way property of time which has no analogue in space.</blockquote>
-让我们任意画一个箭头。如果我们跟着箭头走，我们在世界的状态中发现越来越多的随机元素，那么箭头就指向未来; 如果随机元素减少了箭头指向过去的指向。这是物理学已知的唯一区别。如果我们的基本论点得到承认，随机性的引入是唯一不可撤销的事情，那么这一点就立刻得到了证实。我将用“时间的箭头”这个短语来表达时间的这种单向性质，这种性质在空间上没有类似的东西
+“让我们任意画一个箭头。如果我们跟着箭头走，我们在世界的状态中发现越来越多的随机元素，那么箭头就指向未来; 如果随机元素减少了，那么箭头指向过去。这是物理学中已知的唯一区别。如果我们的基本论点得到承认，随机性的引入是唯一不可撤销的事情，那么这一点就立刻得到了证实。我会用“时间箭头”这个短语来表达时间的这种单向性质，这种性质在空间上没有类似的东西”
@@ 第145行： / 第140行： @@
 Eddington then gives three points to note about this arrow:
-关于这个箭头，Eddington 给出了三点注意事项:
+关于这个箭头，爱丁顿给出了三点注意事项:
@@ 第155行： / 第150行： @@
   It is vividly recognized by consciousness.
-它被意识生动地认识到。
+它能通过意识被生动地认识到
 # It is equally insisted on by our reasoning faculty, which tells us that a reversal of the arrow would render the external world nonsensical.
@@ 第167行： / 第162行： @@
   It makes no appearance in physical science except in the study of organization of a number of individuals. (By which he means that it is only observed in entropy, a statistical mechanics phenomenon arising from a system.)
-除了研究一些个体的组织结构外，它在自然科学中没有出现。(他的意思是只有在熵中才能观察到，熵是一个系统产生的统计力学现象。)
+除了研究一些个体的组织结构外，它在自然科学中没有出现。(他的意思是只有在熵中才能观察到，熵是一个系统产生的统计力学现象。
@@ 第177行： / 第169行： @@
 According to Eddington the arrow indicates the direction of progressive increase of the random element. Following a lengthy argument upon the nature of thermodynamics he concludes that, so far as physics is concerned, time's arrow is a property of entropy alone.
-根据 Eddington 的说法，箭头表示随机元素逐渐增加的方向。在对热力学性质进行了长时间的争论之后，他得出结论，就物理学而言，时间之箭仅仅是熵的属性。
+根据爱丁顿的说法，箭头表示随机元素逐渐增加的方向。在对热力学性质进行了长时间的争论之后，他得出结论，就物理学而言，时间之箭是只属于熵的属性。
@@ 第207行： / 第199行： @@
 The arrow of time is the "one-way direction" or "asymmetry" of time. The thermodynamic arrow of time is provided by the second law of thermodynamics, which says that in an isolated system, entropy tends to increase with time. Entropy can be thought of as a measure of microscopic disorder; thus the second law implies that time is asymmetrical with respect to the amount of order in an isolated system: as a system advances through time, it becomes more statistically disordered. This asymmetry can be used empirically to distinguish between future and past, though measuring entropy does not accurately measure time. Also, in an open system, entropy can decrease with time.
-时间之箭是时间的“单向方向”或“不对称”。热力学的时间箭头是由热力学第二定律提供的，它说在一个孤立的系统中，熵倾向于随着时间而增加。熵可以被认为是一种微观无序的度量; 因此，第二定律意味着在一个孤立的系统中，相对于有序的数量而言，时间是不对称的: 当一个系统随着时间推进时，它会变得更加无序。这种不对称性可以被经验性地用来区分未来和过去，尽管测量熵并不能准确地测量时间。而且，在一个开放的系统中，熵会随着时间而减少。
+时间之箭是指时间的“单向”或“不对称”。热力学的时间箭头是依据'''<font color="#ff8000"> 热力学第二定律the second law of thermodynamics'''，在一个孤立的系统中，熵倾向于随着时间而增加。熵可以看作是一种对微观无序的度量; 因此，第二定律意味着在一个孤立的系统中，相对于有序的数量而言，时间是不对称的: 当一个系统随着时间推进时，它会变得更加无序。尽管测量熵并不能准确地测量时间，但这种不对称性可以用作区分未来和过去的经验。而且，在一个开放的系统中，熵会随着时间而减少。
@@ 第217行： / 第207行： @@
 British physicist Sir Alfred Brian Pippard wrote, "There is thus no justification for the view, often glibly repeated, that the Second Law of Thermodynamics is only statistically true, in the sense that microscopic violations repeatedly occur, but never violations of any serious magnitude. On the contrary, no evidence has ever been presented that the Second Law breaks down under any circumstances." However, there are a number of paradoxes regarding violation of the second law of thermodynamics, one of them due to the Poincaré recurrence theorem.
-英国物理学家 Alfred Brian Pippard 爵士写道: “因此，经常油嘴滑舌地重复的观点是没有正当理由的，即热力学第二定律理论只在统计上是正确的，即微观违反反反复发生，但从未发生任何严重程度的违反。相反，从来没有任何证据表明第二定律在任何情况下失效。”然而，有一些关于违反热力学第二定律的悖论，其中一个是由于庞加莱始态复现定理。
+英国物理学家阿尔弗雷德·布莱恩·派帕德爵士写道: “经常油嘴滑舌地重复的观点是没有依据的，尽管热力学第二定律理论只在统计学上是正确的，而在微观世界中的违反重复发生，但从未发生任何严重程度的违反。相反，从来没有任何证据表明第二定律在任何情况下失效。”然而，一些关于违反热力学第二定律的悖论的确存在，其中一个是由于'''<font color="#ff8000">庞加莱始态复现定理the Poincaré recurrence theorem</font>'''。
@@ 第227行： / 第217行： @@
 This arrow of time seems to be related to all other arrows of time and arguably underlies some of them, with the exception of the weak arrow of time.
-这个时间之箭似乎与所有其他时间之箭有关，并且可以说是其中一些之箭的基础，除了时间之箭微弱之外。
+热力学时间之箭似乎与其他所有的时间之箭有关，并且可以说是其中一些之箭的基础，除了弱时间之箭之外。
@@ 第237行： / 第227行： @@
 Harold Blum's 1951 book Time's Arrow and Evolution "explored the relationship between time's arrow (the second law of thermodynamics) and organic evolution." This influential text explores "irreversibility and direction in evolution and order, negentropy, and evolution." Blum argues that evolution followed specific patterns predetermined by the inorganic nature of the earth and its thermodynamic processes.
-Harold Blum 在1951年出版的《时间之箭与进化》一书中“探索了时间之箭(热力学第二定律)与有机进化之间的关系。”这个有影响力的文本探索“不可逆性和方向的进化和秩序，负熵，和进化。”布鲁姆认为，进化遵循特定的模式预先确定的无机性质的地球及其热力学过程。
+哈罗德·布鲁姆（音译）在1951年出版的《时间之箭与进化》一书中“探索了时间之箭(热力学第二定律)与有机进化之间的关系。”这个有影响力的文本探索“不可逆性和方向的进化和秩序，负熵，和进化。”布鲁姆认为，进化遵循特定的模式，这种模式由地球的无机性质及其热力学过程预先确定。
@@ 第257行： / 第244行： @@
 The cosmological arrow of time points in the direction of the universe's expansion. It may be linked to the thermodynamic arrow, with the universe heading towards a heat death (Big Chill) as the amount of usable energy becomes negligible. Alternatively, it may be an artifact of our place in the universe's evolution (see the Anthropic bias), with this arrow reversing as gravity pulls everything back into a Big Crunch.
-宇宙的时间箭头指向宇宙膨胀的方向。它可能与热力学箭头有关，当可用能量变得微不足道时，宇宙正走向热死亡(Big Chill)。或者，它可能是我们在宇宙演化中所处位置的人工制品(见人择偏差) ，随着重力将一切拉回大坍缩，这个箭头发生了逆转。
+'''<font color="#ff8000"> 宇宙时间之箭The cosmological arrow of time</font>'''指向宇宙膨胀的方向。它可能与热力学箭头有关，当可用能量变得微不足道时，宇宙正走向热死亡（'''<font color="#ff8000"> 大冷寂Big Chill</font>'''）。或者，它可能是我们在宇宙演化中所处位置的人工制品(见'''<font color="#ff8000"> 人择偏差the Anthropic bias</font>''') ，随着重力将一切拉回大坍缩，这个箭头发生了逆转。
@@ 第267行： / 第254行： @@
 If this arrow of time is related to the other arrows of time, then the future is by definition the direction towards which the universe becomes bigger. Thus, the universe expands—rather than shrinks—by definition.
-如果这个时间箭头与时间的其他箭头相关，那么根据定义，未来就是宇宙变得更大的方向。因此，按照定义，宇宙是膨胀的，而不是缩小的。
+如果这个'''<font color="#ff8000"> 时间箭头arrow of time</font>'''与时间的其他箭头相关，那么根据定义，未来宇宙将变得更大。因此，按照定义，宇宙是膨胀的，而不是缩小的。
@@ 第277行： / 第264行： @@
 The thermodynamic arrow of time and the second law of thermodynamics are thought to be a consequence of the initial conditions in the early universe. Therefore, they ultimately result from the cosmological set-up.
-热力学的时间箭头和热力学第二定律被认为是早期宇宙初始条件的结果。因此，它们最终是宇宙学设置的结果。
+'''<font color="#ff8000"> 热力学时间箭头The thermodynamicarrow of time</font>'''和'''<font color="#ff8000"> 热力学第二定律the second law of thermodynamics</font>'''被视为宇宙早期初始条件下的结果。因此，最终她们是宇宙学的设置引发的。
@@ 第287行： / 第274行： @@
 === Radiative arrow of time ===
-时间的辐射箭
+辐射时间之箭
 Waves, from [[radio waves]] to [[sound waves]] to those on a pond from throwing a stone, expand outward from their source, even though the [[wave equation]]s accommodate solutions of convergent waves as well as radiative ones. This arrow has been reversed in carefully worked experiments that created convergent waves,<ref>{{cite web |url=http://www4.ncsu.edu/~fouque/fink.pdf|archive-url=https://web.archive.org/web/20051231022842/http://www4.ncsu.edu/~fouque/fink.pdf |archive-date=31 December 2005 |url-status=dead |title=Time-Reversed Acoustic |author=Mathias Fink |date=30 November 1999 |access-date=27 May 2016 |author-link=Mathias Fink }}</ref> so this arrow probably follows from the thermodynamic arrow in that meeting the conditions to produce a convergent wave requires more order than the conditions for a radiative wave. Put differently, the probability for initial conditions that produce a convergent wave is much lower than the probability for initial conditions that produce a radiative wave. In fact, normally a radiative wave increases entropy, while a convergent wave decreases it,{{Citation needed|date=May 2010}}<!-- ref>{{cite book |author1=Nikolai Chernov |author2=Roberto Markarian |year=2006 |title=Chaotic Billiards |publisher=American Mathematical Soc. |page=207 |isbn=978-0-8218-4096-2}}</ref --> making the latter contradictory to the second law of thermodynamics in usual circumstances.
@@ 第293行： / 第280行： @@
 Waves, from radio waves to sound waves to those on a pond from throwing a stone, expand outward from their source, even though the wave equations accommodate solutions of convergent waves as well as radiative ones. This arrow has been reversed in carefully worked experiments that created convergent waves, so this arrow probably follows from the thermodynamic arrow in that meeting the conditions to produce a convergent wave requires more order than the conditions for a radiative wave. Put differently, the probability for initial conditions that produce a convergent wave is much lower than the probability for initial conditions that produce a radiative wave. In fact, normally a radiative wave increases entropy, while a convergent wave decreases it,<!-- ref></ref --> making the latter contradictory to the second law of thermodynamics in usual circumstances.
-波，从无线电波到声波，再到池塘里的石头，从它们的源头向外扩展，即使波动方程包含了会聚波和辐射波的解。这个方向在精心设计的产生收敛波的实验中被颠倒过来，所以这个方向可能来自热力学方向，因为满足产生收敛波的条件比产生辐射波的条件需要更多的次序。换句话说，产生会聚波的初始条件的概率远低于产生辐射波的初始条件的概率。事实上，正常情况下，辐射波会增加熵，而会聚波会减少熵，! -- ref -- 使后者在通常情况下与热力学第二定律相矛盾。
+虽然波动方程包含了会聚波和辐射波的解，但所有的波，从无线电波到声波，再到石头扔进池塘里产生的波，都是从源头向外扩展。这个方向在精心设计的产生收敛波的实验中被颠倒过来，所以这个方向可能来自热力学方向，因为满足产生收敛波的条件比产生辐射波的条件需要更多的次序。换句话说，产生会聚波初始条件的概率远低于产生辐射波初始条件的概率。事实上，正常情况下，辐射波会增加熵，而会聚波会减少熵，<!-- ref></ref -->使后者在通常情况下与热力学第二定律相矛盾。
@@ 第303行： / 第290行： @@
 === Causal arrow of time ===
-时间的因果关系箭头
+因果时间箭头
 A [[causality|cause]] precedes its effect: the causal event occurs before the event it causes or affects. Birth, for example, follows a successful conception and not vice versa. Thus causality is intimately bound up with time's arrow.
@@ 第517行： / 第504行： @@
 — Omar Khayyám (translation by Edward Fitzgerald).
-ー Omar khayy m (翻译: Edward Fitzgerald)。
+— Omar Khayyám (翻译: 爱德华·菲茨杰拉德)。
 </blockquote>
@@ 第523行： / 第510行： @@
 </blockquote>
-/ blockquote
+</blockquote>
@@ 第597行： / 第584行： @@
 == Further reading ==
-进一步阅读
+深入阅读
 * {{cite journal | last1 = Lebowitz | first1 = Joel L. | authorlink = Joel L. Lebowitz | year = 2008| title = Time's arrow and Boltzmann's entropy | journal = [[Scholarpedia]] | volume = 3 | issue = 4| page = 3448 | doi = 10.4249/scholarpedia.3448 |bibcode = 2008SchpJ...3.3448L | doi-access = free }}
@@ 第680行： / 第667行： @@
+==编辑推荐==

“时间之箭”的版本间的差异

2020年10月17日 (六) 16:01的版本

目录

Overview

Overview

Eddington

Eddington

Arrows

Arrows

Thermodynamic arrow of time

Thermodynamic arrow of time

Cosmological arrow of time

Cosmological arrow of time

Radiative arrow of time

Radiative arrow of time

Causal arrow of time

Causal arrow of time

Particle physics (weak) arrow of time

Particle physics (weak) arrow of time

Quantum arrow of time

Quantum arrow of time

Quantum source of time

Quantum source of time

Psychological/perceptual arrow of time

Psychological/perceptual arrow of time

See also

See also

References

References

Further reading

Further reading

External links

External links

编辑推荐

导航菜单

搜索