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Results tagged with general-relativity
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user 101084
A theory that describes how matter interacts dynamically with the geometry of space and time. It was first published by Einstein in 1915 and is currently used to study the structure and evolution of the universe, as well as having practical applications like GPS.
2
votes
1
answer
122
views
Time-varying gravitational constant a 'well-posed' question?
To my knowledge, some famous physicists such as Dirac and Dyson (perhaps among others) have advocated for the possibility that Newton's gravitational constant $G_N$ might be "time-dependent".
I have …
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4
votes
0
answers
234
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The (Newton-Laplace-Ivory-Arnold) shell theorem in general relativity
It is well-known that Birkhoff's theorem and the classification of LTB spacetimes proves one version of Newton's shell theorem in the context of GR. Another statement in Newtonian gravity, often under …
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1
vote
0
answers
54
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Confusions about Israel's paper on junctions / singular shells in GR
After reading Israel's well-known paper superficially (see also the erratum) I thought that his formulas (38)-(40) were necessary and sufficient conditions to join two manifolds along a time-like surf …
- 643
3
votes
1
answer
106
views
Why should LTB dust be comoving?
In many research papers about inhomogeneous cosmology, one often considers spherically symmetric (LTB) spacetimes where in the co-ordinate frame $(t,r,\theta,\varphi)$ wherein the metric assumes the f …
- 643
8
votes
1
answer
523
views
Simple metric of stellar collapse
Is there a simple metric (Lorentzian manifold) known which exhibits the formation of a black hole while not having any white hole counterpart and which moreover satisfies the strong and dominant energ …
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