Demystifier's latest activity
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Demystifier reacted to akhmeteli's post in the thread Undergrad On computing quantum waves exactly from classical action with
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Sorry, I did not provide the link. The article is actually in open access. -
Demystifier replied to the thread Undergrad On computing quantum waves exactly from classical action.arXiv link: https://arxiv.org/abs/2405.06328 -
Demystifier reacted to Ibix's post in the thread Graduate How valid is the Block Universe theory? with
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It's an interpretation, so not testable as far as we know. It's far and away the most popular interpretation, and fits well with the... -
Demystifier replied to the thread High School Buoyancy and gravity.If ##g## is small but nonzero, then so is ##p=\rho g h##. -
Demystifier replied to the thread High School Buoyancy and gravity.The pressure of the water is ##p = \rho g h##, so gravity enters through the ##g##. But the force of the water ##pA## (where ##A## is... -
Demystifier replied to the thread Is the quantum wave function a real object or a mathematical tool?.Schrodinger equation is similar to the Hamilton-Jacobi equation, so I find intuitive the interpretation in which the wave function is... -
Demystifier reacted to PeterDonis's post in the thread Undergrad Why is gravity a fictitious force? with
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See the bolded addition in the quote above. Without it the statement is false. Again see the bolded addition. I think both additions... -
Demystifier replied to the thread Undergrad Why is gravity a fictitious force?.Yes, but the Schwarzschild spacetime is unphysical, in the sense that it describes an eternal black hole. A physical black hole is a... -
Demystifier replied to the thread Undergrad Why is gravity a fictitious force?.I guess you mean Riemann tensor, because, according to GR, Ricci tensor cannot change without a change of energy-momentum. -
Demystifier replied to the thread Undergrad Why is gravity a fictitious force?.What is a physical cause of boundary conditions, if not a presence of energy-momentum? -
Demystifier replied to the thread Undergrad Why is gravity a fictitious force?.What else can change, if not the stress-energy tensor? -
Demystifier reacted to PAllen's post in the thread Undergrad Why is gravity a fictitious force? with
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There can be two topologically different manifolds with the same metric everywhere, neither of which is incomplete in any way. A pure... -
Demystifier reacted to PeterDonis's post in the thread Undergrad Why is gravity a fictitious force? with
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Where you said: You're misdescribing this. The maximal analytic extension tells us the maximal global manifold that has the same local... -
Demystifier replied to the thread Undergrad Why is gravity a fictitious force?.At least sometimes one does. For definiteness, let us consider the example of the Kerr metric. -
Demystifier replied to the thread Undergrad Why is gravity a fictitious force?.I see your point, but in GR one usually thinks backwards. One first finds an analytic expression for the metric tensor (usually as a...