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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之箭。这样的过程应该产生了早期宇宙中物质。

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，它们也应该是时间不可逆的，因此建立了一个时间之箭。应该是这样的过程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 ===