amrit comments on Timeless Physics - Less Wrong

32 Post author: Eliezer_Yudkowsky 27 May 2008 09:09AM

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Comment author: Doug_S. 28 May 2008 04:23:43AM 0 points [-]

It's worse than just P-symmetry (parity) violation. There's also CP-symmetry (charge-parity) breaking, which, given CPT symmetry (a fairly reasonable assumption given current knowledge) means that the weak nuclear force also violates T-symmetry. Even without the second law of thermodynamics, you would be able to put an arrow to time by observing the decay of certain particles.

Therefore, we need time.