Time Reversal Breaking in Classical Systems

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hokhani
TL;DR Summary
Classical systems without time reversal
I am looking for an example of a classical system without time reversal symmetry. I would appreciate any help.

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Summary:: Classical systems without time reversal

I am looking for an example of a classical system without time reversal symmetry. I would appreciate any help.
Classical physics is symmetric under time reversal. Entropy is the only arrow that I know of classically.

vanhees71
Gold Member
As example of classical systems that exhibit behavior that (in some practical sense at least) is not quite symmetric regarding time reversal I guess you could look at chaotic systems.

the banal pendulum with friction
$$\ddot x+x=-\dot x$$
is not invariant under the change ##t\mapsto -t##

vanhees71