Monday, June 26, 2017

A gravitational singularity or space-time singularity is a location in space-time where the gravitational field of a celestial body becomes infinite

27 june 2017.
https://en.wikipedia.org/wiki/Gravitational_singularity

A gravitational singularity or space-time singularity is a location in space-time where the gravitational field of a celestial body becomes infinite in a way that does not depend on the coordinate system. The quantities used to measure gravitational field strength are the scalar invariant curvatures of space-time, which includes a measure of the density of matter. Since such quantities become infinite within the singularity, the laws of normal space-time cannot exist.[1][2]
A gravitational singularity as predicted by general relativity is at the center of a black hole: any star collapsing beyond a certain point (the Schwarzschild radius) would form a black hole, inside which a singularity (covered by an event horizon) would be formed.[3] The Penrose–Hawking singularity theorems define a singularity to have geodesics that cannot be extended in a smooth manner.[4] The termination of such a geodesic is considered to be the singularity.
According to modern general relativity, the initial state of the universe, at the beginning of the Big Bang, was a singularity.[5] Both general relativity and quantum mechanics break down in describing the earliest moments of the Big Bang,[6] but in general, quantum mechanics does not permit particles to inhabit a space smaller than their wavelengths.[7]

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