black hole equation on blackboard

ANGULAR MOMENTUM OF A BLACK HOLE = a x M, where M is the black hole mass and “a” is a parameter. a = “Kerr parameter” - solution for spinning BH depends on mass and Kerr parameter. a/M = 0: no spin: Schwarzschild

black hole - solution depends on mass only. a/M = 1: maximally rotating (Kerr) black hole. Space around a spinning Black Hole

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How do you calculate the spin of a black hole?

Oct 19, 2021 · Black holes are proposed by astrophysicists as regions of space where gravity … holes, they wanted more than just mathematical equations on a blackboard; … Categories B Blackboard Post navigation

What is a black hole?

Black Holes and Blackboards: What Theory Research Looks Like Using math to understand how the universe works has always excited me beyond measure. Before coming to UCSB, however, I had absolutely no idea what research in theoretical astrophysics actually looks like.

How can we make a black hole with a constant mass?

Feynman went to the blackboard and began working out the equations for spontaneous emission from black holes. Up to this point in history, it had been thought that all black holes were completely black, that a black hole could never emit on its own any kind of energy.

What is the entropy of a black hole?

Nov 12, 2012 · The Penrose diagram for black holes leads to an understanding of wormholes, also known as Einstein-Rosen bridges. Professor Susskind then describes the process of black hole formation through the simplest possible mechanism: an infalling sphere of radiation. This process is studied by marrying a Penrose diagram for the flat spacetime inside the ...

Did Feynman discover Hawking radiation?

An interesting story told by Physicist Alan Lightman is that Feynman actually discovered Hawking radiation 1 year before Hawking. According to Lightman , Feynman overheard him and fellow students talking about black holes and immediately became interested in the conversation .

What is the mathematics of black hole?

For example, when very massive stars run out of nuclear fuel, they cool down and they collapse, and at some point they become small enough so that the whole mass fits within a Schwarzschild radius – therefore they form a black hole. For example, the Schwarzschild radius of the Sun is of the order of a few kilometres.Nov 13, 2015

Is black hole solved?

Stephen Hawking's black hole information paradox has bedevilled scientists for half a century and led some to question the fundamental laws of physics. Now scientists say they may have resolved the infamous problem by showing that black holes have a property known as “quantum hair”.Mar 17, 2022

Can data escape a black hole?

One of the leading researchers is Netta Engelhardt, a 32-year-old theoretical physicist at the Massachusetts Institute of Technology. She and her colleagues have completed a new calculation that corrects Hawking's 1974 formula; theirs indicates that information does, in fact, escape black holes via their radiation.Aug 23, 2021

What did Einstein say about the black hole?

Black holes are regions of spacetime where gravity's pull is so strong that nothing, not even light, can escape from being dragged in and "eaten." Einstein's theory of general relativity predicted the existence of black holes and that, no matter what such an object "eats," black holes are characterized only by their ...Nov 2, 2021

What is special about the number 6174?

6174 is known as Kaprekar's constant after the Indian mathematician D. R. Kaprekar. This number is renowned for the following rule: Take any four-digit number, using at least two different digits (leading zeros are allowed).

What number is black hole number?

Well, the connotation for the number 4 is apparently given as The black hole number.May 8, 2021

Why is the number 4 black hole?

Count the number of characters in its spelling (count spaces and hyphens). Repeat and you get 4. Repeat and you get 4. Once you reach 4, you never get out, so you have reached the black hole.

How do you calculate the gravitational pull of a black hole?

derived the formula for gravitational force acting between black hole and the light particles on the basis of Newton's universal laws of gravitation (F = Gm1m2/r2) using Einstein's mass-energy equivalence relation (E = mc2), quantum theory of radiation (E = hν) and Schwarzschild radius for Non-spinning and spinning ...

Can humans create a black hole?

To make a black hole, one must concentrate mass or energy sufficiently that the escape velocity from the region in which it is concentrated exceeds the speed of light. Some extensions of present physics posit the existence of extra dimensions of space.

Are wormholes real?

Wormholes are sci-fi staples; over the years, many stories, books and movies have sent their protagonists zipping between widely separated locales via these cosmic shortcuts. Wormholes are possible, according to Einstein's general theory of relativity, but nobody has ever spotted one.Oct 25, 2019

Has the black hole information paradox evaporated?

Since the black hole never evaporates, information about its initial state can remain inside the black hole and the paradox disappears. However, there is no accepted mechanism that would allow Hawking radiation to stop while the black hole remains macroscopic.