Demystifier's latest activity

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...

Schrodinger equation is similar to the Hamilton-Jacobi equation, so I find intuitive the interpretation in which the wave function is...

See the bolded addition in the quote above. Without it the statement is false. Again see the bolded addition. I think both additions...

Yes, but the Schwarzschild spacetime is unphysical, in the sense that it describes an eternal black hole. A physical black hole is a...

I guess you mean Riemann tensor, because, according to GR, Ricci tensor cannot change without a change of energy-momentum.

What is a physical cause of boundary conditions, if not a presence of energy-momentum?

What else can change, if not the stress-energy tensor?

There can be two topologically different manifolds with the same metric everywhere, neither of which is incomplete in any way. A pure...

Where you said: You're misdescribing this. The maximal analytic extension tells us the maximal global manifold that has the same local...

At least sometimes one does. For definiteness, let us consider the example of the Kerr metric.

I see your point, but in GR one usually thinks backwards. One first finds an analytic expression for the metric tensor (usually as a...

Your very question proves me right, because you ask about the physical meaning, namely about the interpretation. But I meant it as an...

I'm not sure about that. Suppose that someone tells you that the Schwarzschild ##g_{\mu\nu}(t,r,\theta,\varphi)## is not a metric...

The difference between Schwarzschild metric and black hole spacetime is in the interpretation of the interior behind the horizon. But we...

"The exact Schwarzschild metric" is not the same as "a black hole spacetime". The issue here isn't the local solution; it's been known...