All Questions
56
questions
6
votes
1
answer
118
views
How come the magnetic field disappears when a neutron star becomes a black hole, while the rotation remains?
The only question I found is this one, but this considers as non-rotating neutron star collapsing:
Our final and most comprehensive test is represented by the collapse to a BH of a magnetized ...
- 29k
1
vote
1
answer
143
views
How to describe the four-current of a tilted loop in Kerr spacetime
consider the Kerr metric in Boyer-Lindquist coordinates.
We usually describe the source of an electromagnetic field by the four vector $J^\mu$.
$$J^\mu = \{\rho, j^1, j^2, j^3\}.$$
Now we have an ...
- 268
2
votes
0
answers
80
views
Is it worth to study the "Membrane Paradigm" of black holes nowadays? [closed]
I'm very interested in the region near the outer event horizon and its magnetohydrodynamic enviroment physics. For instance, I'm beggining to study the Blandford-Znajek process, and subjects related. ...
- 3,085
2
votes
1
answer
259
views
Magnetic Reissner-Nordstrom Black holes
I am studying the RN black hole from Carroll, but i have a hard time following his explanations given in page 254.
To solve for the purely electrically charged black hole, one introduces the four-...
- 2,478
1
vote
0
answers
58
views
Do Electrically Neutral Black Holes Interact With a Charge's Electromagnetic Field?
I've been wondering if it's possible for a black hole to interfere with the electromagnetic field of an electric charge, without the black hole itself having an electric charge.
Imagine that there is ...
1
vote
0
answers
42
views
Can Zeeman effect be observed around black holes?
I'm trying to study the motion of charged-spinning test particles around a black hole immersed in the magnetic field. There will be spin-orbit coupling due to the spin of the particle, and external ...
- 31
2
votes
0
answers
50
views
Same Mass But Less Gravitational Effect Due To Electric Charge?
The Schwarzschild metric describes a spherical, eternal, static black hole with no rotation and no electrical charge, so it can be used to understand gravity around objects with negligible rotations (...
1
vote
0
answers
58
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Black $p$-brane solution
Im trying to confirm that the metric (11) in the paper below is a solution to Einstein's equations (6). I tried to use the metric and extract $\lambda=(1-(r_+/r)^{D-3})^{1/2-\gamma/2(D-3)}$ and $R=r(1-...
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-2
votes
1
answer
118
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How can a black hole have electromagnetic field? [duplicate]
I know that everything that is shaped from gravity force is rotating, and gravity is a central force, but I want to know how we can understand that a black hole has an angular momentum? By which sign ...
- 39
10
votes
3
answers
1k
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Does an accelerating charged black hole emit EM radiation?
I have read this question:
Charged particle is accompanied with EM radiation (has field that falls with distance as 1/r) when it moves with acceleration.
Does a constantly accelerating charged ...
- 29k
2
votes
1
answer
70
views
Question on Einstein Field Equations: charged black holes and fluids
Introduction
Suppose then you're asked to find the metric of a charged black hole. Given a generic, static and spherically symmetric metric tensor,
$\text{d}s^{2} = A(r)\text{d}t^{2} + B(r)\text{d}r^{...
- 3,085
3
votes
0
answers
52
views
What would a merger look like from inside a black hole (and would we even notice it)?
I have read this question:
We start with a rocket hovering at a constant distance away from the black hole
At time t0 our observer leaves the rocket and starts falling towards the black hole.
At time ...
- 29k
6
votes
5
answers
640
views
Inside a black hole, can I see my reflection in a mirror (is the law of reflection still valid)?
I am not asking what happens to light that is emitted from a flashlight. I am specifically asking what happens to light that hits a mirror inside a black hole.
I have read this question:
So inside ...
- 29k
1
vote
1
answer
107
views
Does the divergence of the electric potential in the event horizon describe a singularity?
A possible way to analyze the presence of spacetime singularities deals with divergent invariants of the curvature tensor. For example, in the Schwarzschild black hole the scalar quantity defined from ...
- 31
0
votes
0
answers
30
views
Is specific orbital energy conserved when the two bodies are charged
I apologize if this question has already been asked before but I couldn't seem to find it anywhere.
I am currently writing a program that plots charged particles around charged blackholes (Reissner–...
- 67