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Physics

Questions tagged [gravity]

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Gravity is an attractive force that affects and is affected by all mass and - in general relativity - energy, pressure, and stress. Prefer newtonian-gravity or general-relativity if sensible.

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I was watching this video on how to derive the Schwarzschild metric when at around 4:30, he mentions that because the Ricci scalar $R$ is zero, there is no immediate change in volume due to the ...
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In general relativity, the black hole region (B) of an asymptotically flat spacetime $M,g$ is defined globally as$$B := M \setminus J^-(\mathscr I^+),$$and the (future) event horizon is its ...
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I'm trying to publish this paper about a Quantum Gravity using the atomic nucleus, but by now the answer is it's controversial.What do you think?https://www.researchgate.net/publication/...
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Consider a bound two-body system ($M>>m$) such as Earth–Moon. I'm trying to understand whether there's a meaningful asymmetry in how identical dissipation processes affect gravitational entropy ...
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I have two possible scenarios and I wonder whether the electron and arrive before the photon in either of them.Scenario 1: There is an emitter at A, and a reciever at B. Let the midpooint of AB be C....
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While special relativity says inertial mass is equivalent with energy, there are at least two more types of mass, for which equivalence seems not so certain - let me briefly summarize and ask for more ...
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Inside of a shell space time is flat, but you do get time dilation relative to distant observers. As the shell gets smaller, time dilation gets stronger.So does and observer inside of a collapsing ...
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The Oppenheimer–Snyder_model models the collapse of an object into a black hole.But what if the object is strongly charged, is there a model for the collapse of a spherical cloud of charged matter ...
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We know universe is expanding and space is also expanding.When why we dont feel the space around us and ourself expanding or stretching .even an big objectDoes it negligible?
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“If mass and energy are equivalent, and black holes evaporate by losing energy via Hawking radiation, does that mean singularities never actually form — that they’re replaced by ultra-dense, finite ...
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Did gravity exist at our universes' $t_0$ (initial singularity)? Or, did gravity only exist after Mass was established with the creation of the Higgs Boson?What period of time was there between $t_0$ ...
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I am currently looking at the Oppenheimer Snyder Collapse model analytically. The interior metric is described as the FLRW metric:$$ds^2 = - d \tau^2 + a^2(\tau)(d \chi^2 + sin^2 \chi d\Omega^2)$$...
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OKay, I know hollywood just be hollywooding science fiction movies. However, to my understanding the movie Interstellar had a physicist Kip Thorne who informed them on some aspects in astrophysics. ...
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Cosmic expansion is described by the FLRW scale factor 𝑎(𝑡), while locally bound systems are well modelled by the Schwarzschild or Schwarzschild–de Sitter metric.The usual explanation is that ...
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In several discrete-geometry approaches — such as Regge calculus, causal sets, and graph-based Ricci curvature — local curvature is defined combinatorially rather than through differential geometry....

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