Black Holes Spin!. by Paola Rebusco. MIT, April 22nd 2009. BH have NO HAIR. By J.A. Wheeler. Black Holes’ Anatomy. Once they form they are left with ……… Mass Spin Charge. km. miles. Some History.
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by Paola Rebusco
MIT, April 22nd 2009
By J.A. Wheeler
Once they form they are left with
John Michell (1784) and Pierre-Simon Laplace (1796) propose the existence of “dark stars”…that lock in light (in Newtonian mechanics)
Albert Einstein publishes his first paper on GR (1915)
Karl Schwarzschild finds black holes as a solution to Einstein’s equations (1916)
Subrahmanyan Chandrasekhar suggests that a massive star can collapse into something denser (1930)
Robert Oppenheimer and Hartland Snyder predict that massive stars can collapse into black holes (1939)
Roy Kerr finds the solution for rotating black holes (1963)
Stephen Hawking considers quantum effects: quantum black holes are different from classical black holes (1974)
A sun-lit pasture field, with cattle and horses feeding;
And haze, and vista, and the far horizonS, fading away..
Walt Whitman - Leaves of Grass 1900
TEST: Gravity Probe B
how do they form?!
Supernovae Type II and Hypernovae!
What is left?
a=0.75-0.90 (Gammie et al 2004)
NOTE: spin up
Any black hole emits Hawking black body radiation with
The characteristic time for quantum effectsis
For MBH= 1 MSUN ….
The energy reached by the Large Hadron Collider MAY produce micro black holes ( )…if this were to occur, would it be dangerous?Why?
John Wheeler 1967- Physics Today
Live in Galaxies
Affect the Motion of Stars
(A type of galaxy with an Active Galactic Nucleus=AGN)
NGC 1275 is
(Credit: Radio: NRAO/AUI/NSF)
1 light year = 9.4605284 1015 m
ISCO (depends on the spin)
(Miller et al 09)
Courtesy of R.Remillard
What happens at the singularity? Understand Quantum Gravity!!!!!