This is a reminder for:
Title: Claudio Mazzola
Time-Reversal Invariance Is Not Invariance under a Reversal of Time
Time-reversal invariance is a central notion to contemporary philosophy of
time. In accordance with the standard interpretation, a physical theory is
time-reversal invariant just in case, for every sequence of states which is
compatible with its laws, the sequence obtained by reversing the order of
the images of those states as of an appropriate time-reversal operator is
also compatible with those laws. Time-reversal invariant theories are
usually taken to be insensitive to the chosen orientation of time, and
hence to carry positive evidence in favor of the symmetry of time itself.
Moving from some recent results in dynamical systems theory, I offer a
critical examination of time-reversal invariance, as just defined. In
particular, I show that its meaning varies depending on the algebraic
structure which is chosen to model physical time and that, as a
consequence, time-reversal invariant theories become insensitive to the
chosen orientation of time just in case the assumed time model is a
commutative group.
Commutative groups, on the other hand, are themselves highly symmetric
structures. In consequence, the usual understanding of time-reversal
invariance becomes exposed to some major drawbacks.
When: Mon 19 Sep 13:00 – 14:30 Eastern Time - Melbourne, Sydney
Where: Room 422, University of Sydney, Main Quad
Calendar: [email protected]
Who:
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Event details:
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