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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.

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。

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K中介子衰变。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。这样的过程应该产生了早期宇宙中物质。

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.

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.

=== Quantum arrow of time ===

=== Quantum arrow of time ===

{{unsolved|physics|What links the quantum arrow of time to the thermodynamic arrow?}}

{{unsolved|physics|What links the quantum arrow of time to the thermodynamic arrow?}}

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.

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。

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 洛西米特可逆吊诡相冲突。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。

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."

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."

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."

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."

“后⇔过去”和“前⇔之未来”的联系本身是由文化决定的。例如，艾马拉语将“后⇔过去”和“前⇔之未来”联系起来。中国词语后天也与之类似，“后天”字面上意思是“某天之后”, 而“前天” 字面上意思是“某天之前”。

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."

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

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

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:

心理上的时间流逝的另一面是意志和行动。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:

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<poem>

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&nbsp; Moves on: nor all thy Piety nor Wit

&nbsp; Moves on: nor all thy Piety nor Wit

Shall lure it back to cancel half a Line,

Shall lure it back to cancel half a Line,

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