All Questions
Tagged with electromagnetic-radiation black-holes
35
questions
3
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answers
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Photonic black holes
"Can a photon turn into a black hole?" - usually the answer to this question is - it can't, because it has zero rest mass. However, when we derive the Schwarzchild Metric initially the $2M$ ...
- 1,161
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Is the curvature so extreme at the event horizon, that you could see curved laser beams?
I have read this:
Because the spacetime curvature at the horizon is so great that there is no light-like world line the extends beyond the horizon.
Why does time stop in black holes?
If the ...
- 29k
0
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1
answer
142
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What is the smallest possible wavelength? [duplicate]
I was thinking about this the other day after a quantum mechanics lecture (unrelated to the lecture I was taking) and pondered "Is there a minimum wavelength for a photon?", through ...
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1
answer
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Different Escape Velocities of Black Holes?
I am no physics major nor math major to this but merely an amateur cosmology enthusiast, so in my previous inquiries I wasn't able to find anything on the premise that if all black holes obviously ...
- 29
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0
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Super-radiant amplification in electromagnetic perturbation in Kerr background
Let an electromagnetic field be scattered by a Kerr black-hole; then its amplitude will be amplified, but its frequency will remain same (super-radiant amplification). Hence though its intensity will ...
- 756
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3
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Do light particles have thrust? [duplicate]
I understand that nothing is faster than light and that it can not escape a black hole. However, light particles may be fast, but perhaps it can't escape a black hole due to it's lack of thrust power? ...
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11
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1
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Can a Black Hole be moved by lasers?
I've read that an object colliding with a black hole will move it, as it would any other object. Could a laser continuously fired into a black hole move it?
- 719
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2
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Bremsstrahlung Radiation [duplicate]
A thought experiment.
Consider an electron falling into a black hole. From an external observer to the electron and the black hole, the electron accelerates, and should give off Bremsstrahlung ...
- 131
2
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2
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278
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Do white holes bend light?
White holes share a great deal of properties with black holes such as being completely characterized by rotation, mass and charge, even they have a Hawking temperature. However, I am not able to argue ...
- 129
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Does some of accretion disk light make focal points above the black hole poles? [duplicate]
Does some of accretion disk light make focal points above the black hole poles?
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Black holes by blueshifted light
If you can make black holes out of light you can make black holes out of light that is emmited from the moving frame and concentrated into one spot and that would not have enough energy to form a ...
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0
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Could photons eventually turn into black holes according to an observer traveling faster and faster towards the light source due to blue shift?
The following question was answered and the answers do make it seem like photons with a high enough frequency, could, in theory, turn into black holes:
How much energy does a photon need to form a ...
0
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1
answer
58
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Extreme Redshift Detection
There is a new paper in arXiv postulating that black holes might actually let some let some light out. This of course is very theoretical, but it postulates that the light would be redshifted to 640 ...
- 477
3
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1
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98
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Could there be a magnetic version of Hawking radiation?
From my, probably flawed, understanding of Hawking Radiation, virtual particles get turned into non-virtual particles. I'd imagine since both Gravity and Electromagnetism both follow the inverse ...
1
vote
1
answer
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How does light energy increase when passing through the ergo sphere of a black hole?
I watched a video recently about using the ergosphere of a spinning black hole as a source of virtually infinite energy by surrounding it with mirrors and shining electromagnetic waves in there. In ...
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271
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Can High Energy Light Escape a Black Hole after Low Energy Light Cannot
Perhaps there is another way to calculate the escape velocity, or perhaps light always has the same kinetic energy regardless of the energy of the light, but shouldn't the event horizon of a black ...
- 181
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2
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227
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Can a photon circle a black hole indefinitely?
Does a photon lose energy or redshift as it circles?
Will it's wavelength be the rest wavelength with centripetal and gravitational forces exactly cancelling?
- 182
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671
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How does black hole suck light? [duplicate]
I was asked the same by my friend. I said that gravitational attraction also occurs for high energy particles .
My friend said photon is not so very high energy particle which I found on net. He ...
- 1,149
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1
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52
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Can I change the speed of light in vacuum? [duplicate]
General theory of relativity proved that gravity does attract light ( photons ), what if I project a beam of light radially towards a black holes will it increases it's speed or not?
user203191
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1
answer
67
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Photons and Black holes [duplicate]
A black hole is listed as "a region of spacetime exhibiting such strong gravitational effects that nothing—not even particles and electromagnetic radiation such as light—can escape from inside it" One ...
user172320
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0
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Naked Singularities Out of Extremal Black Holes?
Consider a pair of identical extremal black holes at rest. It is a fact that they exert no net force on each other and remain in static equilibrium. Now, clearly, each of the black holes is in ...
user87745
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2
answers
60
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Could one extract light out of a black hole via evanescent waves?
The Schwarzschild radius of a black hole is a classical barrier for light from inside of a black hole. But we know from electromagnetic waves and quantum mechanics that classical barriers can be ...
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4
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1
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235
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Correlation between gravitational and electromagnetic radiation from collision of Kerr-Newman black holes
When black holes collide, they produce a gravitational wave, as has been recently established by LIGO.
When a charge is accelerated, it creates an electromagnetic wave.
Does an accelerated massive ...
- 653
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0
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61
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On a Doppler-shift-induced radiative dissipation of angular momentum for the accretion disk of a black hole
A recent question explored the possibility that the accretion disk of a black hole could wind down and lose its angular momentum through radiative process, and Rob Jeffries' excellent answer there ...
- 134k
3
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1
answer
134
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Do black holes radiate light? [duplicate]
I have a difficulty with understanding Hawking radiation. So far, I have "understood" (I can be wrong!), that the intense gravity of a black hole can split pairs of virtual particles so that one ...
- 3,433
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275
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What is the speed of a kugelblitz black hole?
Would a kugelblitz black hole travel at the speed of light? Would it slow down after swallowing more mass?
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3
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Can photons be created without an electric charge involved?
It seems that in common ways how to produce light (electromagnetic waves, photons) must be involved particles with electric charge: accelerating electrons, spontaneous or stimulated emission, gamma ...
- 2,163
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'Hovering' light rays on the edge of a black hole
According to Prof. Hawking, light rays will 'hover' on the edge of a black hole. If this is true, and the light 'stops' on the edge, how can the electric/magnetic fields which, constitute the light, ...
- 470
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3
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779
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Can light escape a black hole? [duplicate]
I heard that a black hole is not black because it's escape velocity is greater than or equals to the speed of light. But instead it is black because the light that gets emitted from a black hole gets ...
- 553
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Why can't light escape a blackhole? [duplicate]
Gravity attracts objects which have mass right. We know that light is massless so why does a black hole's gravity attract light?
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3
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Why is it hard to detect a black hole
I've read in some texts that we can't directly observe a black hole in space because not even light can escape from its gravity. Some of the indirect observational methods mentioned are, gravitational ...
- 359
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Primordial black hole: how dense does matter need to be to feed it?
Primordial black holes are a dark matter candidate.
Suppose you put a primordial black hole the mass of an asteroid in Earth's core. Will it grow? NO! The black hole will be on the order of a proton ...
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What is the effect of gravity on gamma rays?
I read an article about a Gamma Ray burst linked to a black hole. How does high gravity fields affect gamma rays?
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Can a black hole be formed by electromagnetic radiation?
I'm trying to find out if black holes could be created by focusing enough light into a small enough volume.
So far I have found (any or all may be incorrect):
Maxwell's equations are linear, ...
- 213
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3
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3k
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Light bending by black holes
In the center of our milky way, it is assumed that a black hole exists with a mass of $\approx 4\times 10^6$ times our sun's mass. How much light bending (in degrees) would arise for stars that are in ...
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