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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recordings per month · last 12 monthsRecordings per month over the last 12 months — 1 in all, peaking in Jul 2026 with 1.
Appearances
physics sciences above the subatomic scale at all.
And then the other question is related to that.
Um, the physics w and the science we discover for large scale systems almost always cares a lot about the direction of time.
You know, you and I care a lot about the direction of time, the past of the future seems very different to us.
Past of the future seems very different to a biological system or to a a hot object that's cooling down.
Microscopic physics doesn't give a damn about the difference between the past and the future.
Um and it's been a puzzle for more than a century.
to understand
Like where what's the secret source that can be added to
a microscopic physics that thinks past and future are all the same to get us a a macroscopic physics or or just an ordinary world in which past and future are m manifestly completely different.
Yeah, because um s suppose you take a theory that's not classical and you try to get classical mechanics out as a limit.
Well, did you get out the bit of classical mechanics that cares about the difference between the past and the future or the or the bit that didn't?
If you didn't if you got the bit out that doesn't care about the difference of the past and future, and you know something like the physics of the solar system doesn't care very much about the difference between the past and the future, for instance, if you get that out, then you still haven't worked out where the difference between the past and the future comes from in our kind of everyday large scale work.
If you did get it out, if you recover
Yeah.
about the difference between the past and the future.
Then again we want to know how did that happen?
There's nothing in in the depths of quantum mechanics that cares about the difference between the past and the future.
So if you manage to get something out in the limit that does care
what made it care?
Showing 421–440 of 1,940 · page 22 of 97
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