T symmetry leading to arrow of time

Discussion of theories involving time as a dimension, time travel, relativity, branes, and so on, usually applying to the "real" universe which we live in.

T symmetry leading to arrow of time

Postby Secret » Sat Jan 30, 2016 9:18 am

Recently there's a new article circulating
http://rspa.royalsocietypublishing.org/ ... 670#sec-13

The implications seems quite profound
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Re: T symmetry leading to arrow of time

Postby steelpillow » Tue Feb 13, 2024 5:55 am

That takes a bit of reading!
As far as I can make out, it proposes that it is the breaking of T symmetry which creates the arrow of time, as opposed to the symmetry itself.
From the logical perspective, it seems to me that the arrow is an example of symmetry-breaking. Other examples might be, say, time running faster forward than backward, or flowing smoothly in one direction but in little jumps in the other.
So the other assumptions of QM evidently have a kind of latent arrow in them, requiring only a little symmetry-breaking to manifest it.
Then , what happens when things get Relativistic? In the intense fields around a black hole spacetime gets twisted up; space begins to behave in a timelike way (the arrow of downwards) and time in a spacelike way (less dominated by the arrow). Do black holes break P symmetry while restorlng T symmetry? Umm....
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