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
So we don't really have a story to tell
About
how the physics we don't yet have brings about the initi the quote initial condition, the first stage of the universe we can see.
And in the absence of that theory, it's hard to even assess the whole, is it continued, is it not idea.
I I mean, for instance, if you've got something like the i theories of inflation people talk about, then
Actually the universe is much bigger than it looks, and there's lots of kind of Big Bang like things going on all the time.
And that would give you if that's true, that'll give you both a a metaphysical grasp of what we mean when we say it's contingent how the Big Bang is, and a kind of detailed scientific model.
that represents that contingency as, you know, some probability distribution instead of equations.
But that's all speculative.
There's some evidence for theories of that kind, but um nothing conclusive.
Very nearly, I'd say.
Um and the some of the exceptions are probably not crucial to this question.
If I've got something like an open system where I I want to treat uh effects from the environment around it as just some sort of extr extra input, then that sort of dynamical model doesn't apply.
But in some ways you can then just think about the extra input as more boundary conditions.
Um, that's the general model otherwise we've used in dynamics.
I mean, it's still the model we kind of apply in cosmology.
Um maybe that's wrong, but it's not as if we've got other
good case studies of how to of how to run it.
I m I mean the other thing I suppose worth saying, the slight qualifier I give to your story is quite often you we don't normally treat the initial condition in physics models as just a complete black box that could be anything we feel like.
Uh often we have principles like
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