WebThe "temperature" of a black hole is the temperature that a blackbody emitter emitting the same radiation would be. [10] Hawking radiation depletes a black hole's mass. In this … WebA black hole is so dense that gravity just beneath its surface, the event horizon, is strong enough that nothing – not even light – can escape. The event horizon isn’t a surface like Earth’s or even the Sun’s. It’s a …
Is there a black-hole information equation? - Physics Stack Exchange
WebJan 16, 2024 · 1 According to some sources, black-hole information is proportionate to the surface area, and, the equation trotted out is S = A k 4 l p 2. But according to another source, the entropy and information aren't the same. I … WebApr 11, 2024 · The Black Hole Formula for the Entropy. It is reasonable to suppose that the entropy of a black hole should depend only on one or more of the three observable quantities, M, Q and J. According to the area theorem, the area of the event horizon of a black hole cannot decrease. This reminds us of the behavior of the ordinary … cloud based mobile application development
Bekenstein-Hawking entropy - Scholarpedia
WebOct 29, 2024 · The black hole was not a big black ball but a short line segment. Still, the researchers argued, gravity is gravity, and what goes for this impoverished Lineland should hold for the real universe. (In April 2024, Koji Hashimoto , Norihiro Iizuka and Yoshinori Matsuo of Osaka University analyzed black holes in a more realistic flat geometry and ... Webs 2 = ( 1 − 2 G M d c 2) − 1 ( Δ d) 2 − ( 1 − 2 G M d c 2) ( c Δ t) 2 + r 2 Δ Ω 2. Here G is the universal gravitational constant, c is the speed of light, M is the mass of the object, d is … The formula for the Bekenstein–Hawking entropy ( S) of a black hole, which depends on the area of the black hole ( A ). The constants are the speed of light ( c ), the Boltzmann constant ( k ), Newton's constant ( G ), and the reduced Planck constant ( ħ ). In Planck units, this reduces to S = A 4. See more A black hole is a region of spacetime where gravity is so strong that nothing, including light or other electromagnetic waves, has enough energy to escape its event horizon. The theory of general relativity predicts that a sufficiently compact See more The no-hair theorem postulates that, once it achieves a stable condition after formation, a black hole has only three independent … See more By nature, black holes do not themselves emit any electromagnetic radiation other than the hypothetical Hawking radiation, so astrophysicists searching for black holes must generally rely on indirect observations. For example, a black hole's existence can … See more Entropy and thermodynamics In 1971, Hawking showed under general conditions that the total area of the event horizons of any … See more The idea of a body so big that even light could not escape was briefly proposed by English astronomical pioneer and clergyman John Michell in a letter published in November 1784. Michell's simplistic calculations assumed such a body might have the same … See more Given the bizarre character of black holes, it was long questioned whether such objects could actually exist in nature or whether they were merely pathological solutions to Einstein's equations. Einstein himself wrongly thought black holes would not form, because … See more The evidence for stellar black holes strongly relies on the existence of an upper limit for the mass of a neutron star. The size of this limit heavily depends on the assumptions made about the properties of dense matter. New exotic phases of matter could … See more cloud based money management software