On 2/15/2020 9:30 AM, smitra wrote:
The main issue is unitary time evolution. This is a rather
unambiguous thing that one can check in experiments. A breakdown of
unitary time evolution has never been observed.
As Brent has pointed out, unitary evolution breaks down every time we
observe a particular result for a measurement (to say nothing of black
holes). Your focus on unitary evolution is misplaced -- it is not
universally observed.
This has no bearing on the unitary time evolution of an isolated
system. We can infer from measurements that an isolated system does
evolve in a unitary way. Non-unitary time evolution would violate the
known laws of physics. The information paradox involving black holes
is a problem precisely because of this. No one believes that the
solution involves a non-unitary evolution. Even Hawking who originally
did propose such ideas later reversed himself.
arXiv:hep-th/9503024v3 23 May 1995
Brent
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