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Black-holes
New post in Black-holes
Are black holes perfect spheroids?
July 28th, 2020
black-holes
event-horizon
metric-tensor
symmetry
differential-geometry
Is Hawking radiation really the same as Unruh radiation?
August 31st, 2021
unruh-effect
hawking-radiation
black-holes
Flywheel half-way through the event horizon of a black hole vs the equivalence principle
January 16th, 2022
general-relativity
equivalence-principle
event-horizon
black-holes
Why doesn't physics like infinity (or does it)?
April 7th, 2022
models
approximations
singularities
black-holes
Can a neutron star become a black hole via cooling?
February 20th, 2020
stellar-physics
neutron-stars
astrophysics
black-holes
thermodynamics
How does the Penrose diagram for a spinning black hole differ in realistic scenarios (formed by stellar collapse)?
August 1st, 2022
general-relativity
black-holes
spacetime
causality
kerr-metric
Are we inside a black hole?
October 14th, 2021
cosmology
black-holes
universe
Is the Hawking radiation of a charged black hole thermal?
August 14th, 2020
black-holes
thermal-radiation
hawking-radiation
black-hole-thermodynamics
reissner-nordstrom-metric
How can a black hole produce sound?
July 16th, 2020
black-holes
astrophysics
acoustics
vacuum
frequency
How can a black hole reduce the speed of light?
August 1st, 2022
general-relativity
visible-light
black-holes
speed-of-light
reference-frames
What does string theory predict for the singularity inside a black hole?
August 1st, 2022
general-relativity
black-holes
string-theory
quantum-gravity
singularities
Chasing someone who has fallen into a black hole
July 20th, 2020
general-relativity
black-holes
spacetime
event-horizon
geodesics
How can super massive black holes have a lower density than water?
August 1st, 2022
density
event-horizon
black-holes
Why would a black hole explode?
August 13th, 2022
black-holes
astrophysics
hawking-radiation
quantum-mechanics
An explanation of Hawking Radiation
March 22nd, 2022
black-holes
vacuum
hawking-radiation
qft-in-curved-spacetime
unruh-effect
How do we know the Schwarzschild solution contains an object of mass $M$?
July 12th, 2020
general-relativity
black-holes
mass
metric-tensor
coordinate-systems
Direct observations of a black hole?
August 1st, 2022
astronomy
black-holes
How to get Planck length
January 5th, 2020
absolute-units
physical-constants
dimensional-analysis
quantum-gravity
black-holes
Would touching a black hole of a small mass (the mass of an apple) cause you to spiral in and get dead?
June 29th, 2021
hawking-radiation
general-relativity
black-holes
mass-energy
event-horizon
If electrons were just positrons moving backwards in time, then shouldn't we see them coming out of black holes?
October 2nd, 2021
quantum-field-theory
black-holes
antimatter
qft-in-curved-spacetime
time-reversal-symmetry
Are electrons just incompletely evaporated black holes?
December 25th, 2020
quantum-field-theory
black-holes
standard-model
hawking-radiation
Why does a star collapse under its own gravity when the gravity at its centre is zero?
February 11th, 2020
gravity
black-holes
astrophysics
stars
stellar-evolution
From where (in space-time) does Hawking radiation originate?
January 27th, 2020
hawking-radiation
black-holes
Can black holes actually merge?
August 1st, 2022
collision
astrophysics
black-holes
Why did the universe not collapse to a black hole shortly after the big bang?
November 7th, 2020
cosmology
singularities
big-bang
space-expansion
black-holes
Could an infinite number of photons fit into a finite space?
February 21st, 2022
quantum-field-theory
energy
black-holes
photons
Why doesn't a black hole have linear momentum?
November 19th, 2021
black-holes
reference-frames
momentum
no-hair-theorem
Why can a neutron star implode?
August 1st, 2022
standard-model
pauli-exclusion-principle
neutron-stars
black-holes
astrophysics
How can a black hole emit X-rays?
August 2nd, 2020
gravity
x-rays
black-holes
What does this depiction of a black hole in the movie Interstellar mean?
June 11th, 2020
general-relativity
black-holes
event-horizon
geodesics
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