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(shwôrts′chīld′, shvärts′shĭld)
n.
The radius of a collapsing celestial object at which gravitational forces require an escape velocity that exceeds the velocity of light, resulting in a black hole.

[After Karl Schwarzschild (1873-1916), German astronomer.]

(ˈʃwɔːtsˌʃɪld; German ˈʃvartsʃɪlt)
n
(Astronomy) astronomy the radius of a sphere (Schwarzschild sphere) surrounding a non-rotating uncharged black hole, from within which no information can escape because of gravitational forces
[C20: named after Karl Schwarzschild (1873–1916), US astrophysicist]
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References in periodicals archive ?
The time-proportional Schwarzschild radius and Hawking temperature of black holes have been successfully ascribed to this model universe.
As the size of a black hole defined by the Schwarzschild radius relates to its mass, it's only by acquiring more mass that a supermassive black hole will grow larger, as a greater mass means spacetime is curved over a larger area.
According to the Schwarzschild field solution of (1) [17], the metric of spacetime surrounding a spherical body with mass M appears to be singular at the Schwarzschild radius [r.
As smaller and smaller radii were considered, a radius was reached, now known as the Schwarzschild radius, where the equations revealed something called a singularity--mathematically the sort of thing you get if you divide by zero.
The point at which a stellar object can no longer escape being swallowed by a black hole is known as the Schwarzschild radius, a quantity whose value depends on the black hole's mass, the speed of light and the gravitational constant.
If the 'engine' is a black hole accreting matter, its diameter must be less than the light-travel time across its Schwarzschild radius.
If you plug in the equation above, you'll find that this black hole has a Schwarzschild radius of about.
A black hole's Schwarzschild radius tells how small an object of mass M must be for its surface gravity to be strong enough to trap light.
A constitutive observation of the respective models is the coincidence between the radius of observable universe and the Schwarzschild radius, supposed to be valid over the whole course of the universe's history.
The non-reduced Plank units and the Schwarzschild radius will be useful to the discussion.
This conforms to the Newtonian acceleration of a Planck mass from a distance matching its Schwarzschild radius.

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