Sean Carroll
speaker
26,727 appearances
49 recordings
4 series
first heard Apr 2024
last heard 6d ago
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 — 29 in all, peaking in Jun 2026 with 6.
Appearances
Very often in physics what we'll do is look for what's called an initial value problem, right?
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Like I give you here's the baseball, here's its location, here's its velocity, tell me how it travels on uh
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A parabola-like trajectory through the air before I can catch it.
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Okay?
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That's a very typical setup.
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This is not what's very often done in general relativity.
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In general relativity, often, not always, but often, we just sort of give you a solution that is four-dimensional from the start, and that's what LQBR does.
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So you might ask, given the setup of the LQBR warp drive, is there a way to sort of
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Get the behavior you want.
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from a well defined initial value formulation.
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That is to say, rather than just saying here's the four dimensional space time, you say here is a configuration of matter and energy at one moment of time
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And I'm gonna give you some dynamical equations that tell you how that matter and energy evolve.
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And then I'm gonna solve all the equations for both matter and energy and space-time in the future and see that I get a bubble of warp drive moving purportedly faster than the speed of light from the external point of view.
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So that is not done.
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We don't know how to do that, as far as I know.
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No one has really shown how to do that with sensible
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forms of matter and energy for the LQB or warp drive.
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So to really answer this question, could you escape from a black hole, you would need to set up those initial conditions.
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And a black hole is a weird thing because
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The definition of a black hole involves not just the moment of time, but the future.
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Showing 481–500 of 26,727 · page 25 of 1337
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