Questions tagged [general-relativity]

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.

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In the reference frame of an observer an arbitrarily large distance away, can event horizons form in finite time? [closed]

There are similar questions answered already but the answers disagree. I understand that simultaneity/time is local in GR and that in a given region of space, an event horizon and singularity can form ...
K340's user avatar
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Solve Friedmann equation for non-zero curvature and non-zero cosmological constant

I tried to find an elegant way to solve (without approximating for low densities) $$\dot{R}^2=\frac{8 \pi G}{3 c^2} \rho R^2-k c^2+\frac{c^2 \Lambda}{3} R^2$$ for $k=\pm 1$ and $\Lambda \neq 0$ (one ...
Vincent ISOZ's user avatar
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What happens if $ a^2 > M^2 $ in Kerr metric?

(Boyer-Lindquist coordinates and $ c = G =1 $ taken) As I know, line element in Kerr metric $ d s^2 = - \left( 1 - \frac{2Mr}{\rho^2} \right) d t^2 - \frac{4 M a r \sin^2 \theta}{\rho^2} d \phi d t + \...
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Radiative Energy in a Gravity Well

It has been hypothesized that in the very far future, most or all matter will have decayed into radiation. A planet like Earth is composed of matter, forming a gravity well based upon the total energy ...
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Inertial and a gravitational component of two observers

Started reading the book "How Einstein found his field equations" by Janssen and Renn and I am already blocked on chapter 1. What do the authors means after the "split" below?: &...
gianpaolo's user avatar
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Apparent "centrifugal" like force on a uniformly accelerating relativistic object

So this is more of a special relativity question as it comes from someone who's only savvy in special relativity. What I mean by this is if the answer is only describable in terms of general ...
NaiDoeShacks's user avatar

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