Sean Carroll
speaker
26,951 appearances
50 recordings
4 series
first heard Apr 2024
last heard yesterday
Sean Carroll’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 — 30 in all, peaking in Jun 2026 with 6.
Appearances
So that's really five-dimensional antidecister space times a five-dimensional sphere.
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So that's string theory.
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And the theory that it is dual to, so completely equivalent to, is just an ordinary non-gravitational quantum field theory in four dimensions, four space-time dimensions.
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So that theory has no strings at all.
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Okay, so this is a version of.
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Of string theory without any strings in it, on one way of talking about it.
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And they're related by holography, and it's non-perturbative, it's all very complicated.
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So I think that we don't know is the short answer to here what the strings actually do.
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Um the right way to think about string theory is it wasn't discovered like and this is not at all unusual in the history of physics.
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It wasn't put forward as a complete well-formulated thing, right?
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It was put forward by as like a set of rules that work in a certain regime, and you're trying to figure out the full theory.
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This is exactly how quantum mechanics was invented.
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If you go back to like Planck and Einstein and Bohr and De Broy, they were all like making up these ad hoc rules when they invented quantum mechanics.
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And it wasn't until Heisenberg and Schrdinger in the nineteen mid 1930s.
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25 years later, that we able to have a fully blown theory of quantum mechanics.
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And even then.
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Of course, you all know it's really not fully bone theory because the measurement problem is is still sticking around.
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So we don't exactly know what the right way to think about string theory at the deepest possible level is.
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That's why we gotta keep thinking about it.
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Emmett Francis says, I've been fortunate enough to receive Sean Carroll advice here at a couple previous critical junctures in my academic career, thesis writing, starting my postdoc.
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