David Wallace
speaker
1,940 appearances
2 recordings
1 series
first heard May 2025
last heard 20 Jul
David Wallace’s voice in public audio — every appearance, attributed to the second.
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Appearances
Um, and I've got some microdynamics and then I'm interested in what's happening macroscopically.
At a coarse grain level.
So
The normal way we do statistical physics is that we derive from the microphysics plus um some kind of statistical assumptions about initial conditions.
Some sort of
Macroscopic dynamics, Boltzmann's equation for how
Um gases evolve is a classic example of this.
And most of those macro equations that are derived are stochastic.
There are lots of ways things might turn out, but none of them but but we have but many of them are unlikely and you have a probability measure over them.
So we get in for Boltzmann's equation, the gas is extremely likely.
to spread out to cover the whole of the box, but it might not.
Um
Okay, so
If you're in that situation
Ask yourself how much you can say of
about the macroscopic dynamics if you
only know the microscopic laws of physics, especially like aga again we're pretending a classical here for simplicity.
Sure.
And the answer's almost nothing.
I mean some
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