All Questions
Tagged with black-holes photons
14
questions with no upvoted or accepted answers
2
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Numerical calculation of spherical photon orbits near Kerr black hole
I'm using RK4 method for solving differential equation
$$\frac{d\theta}{d\phi}=\pm(2-2r)\frac{\sqrt{Q-\left(\frac{\Phi^2}{\sin^2\theta}-1\right)\cos^2}\theta}{2r+\left(r^2+\cos^2\theta-2r\right)\frac{\...
- 333
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39
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Would a black hole act as a particle accelerator between the photon sphere and the event horizon?
I'm trying to understand the behavior of photons between the photon sphere and the event horizon. Here is what I think I understand so far :
the radius of the PS is 1.5 times the Schwarzschild radius
...
- 21
2
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1
answer
79
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Orbital Photon Speed at the equatorial plane of a rotating black hole
I've been trying to calculate $d\phi/dt$ of photons orbiting a Kerr black hole (Kerr metric in Boyer-Lindquist coordinates) on the equatorial plane, both counter and along with its rotation. So I used ...
1
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The event horizon of a black hole supposes an absolute zero in some field?
Based on the Schwarzschild black hole theory, if the gravitational pull of the singularity were to equalize the energy that a photon has by approaching the event horizon from a special angle, would it ...
1
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0
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54
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Would photons trapped in a back hole have orbital angular momentum?
In a black hole radiation is trapped, it can’t escape. Its trajectories we bent by the curved spacetime.
So photon would perform at least a partial rotation about the black hole.
Would this ...
- 24.9k
1
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0
answers
90
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Rate of change in de Broglie wavelength in nth orbit.
Suppose I want to calculate the rate of change in de Broglie wavelength of a photon in any orbit number "n" around the black hole. Let it's original de Broglie wavelength be "λ" and the de Broglie ...
- 262
1
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65
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When does a black hole acquire the momentum of entering photon?
Photons carry momenta, momentum is conserved in closed systems, so what would happen when a photon enters a black hole? Supposedly the momentum of the photon will be transferred to the new combined ...
- 916
1
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1
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55
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Is it possible for light to fall into a geo-synchronous orbit around a sufficiently massive planet?
Is it possible for (visible) light to fall into a geo-synchronous orbit around a sufficiently massive planet?
Can a planet or heavenly body be massive enough for it to happen?
What will that ...
- 171
1
vote
1
answer
122
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Photon gas into a Black hole
Can a photon gas have so much energy that it collapse into a black hole just like a regular star?
- 495
1
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2
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106
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The effect black holes have on light
We all know that light loses its energy when it is moving through expanding space and time. And sense a black hole can be summed up to a super compressed space time, shouldn't that mean that a photon ...
0
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45
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The Calculation of the Volume of a Photon Sphere around a Black Hole
So, I chose this question for my chemistry assignment which is "How many moles of photons will it take to fill up the volume of the photon sphere around Sagittarius A". I realized there is ...
- 11
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Photon Sphere Planck Recalibration
Say a black hole's Schwarzchild radius is equal to the Planck length then a horizontal formula can be established as
$A = 4\pi \ell^2$
[1]. I've tried to find an analogue of this set up online but can'...
0
votes
1
answer
66
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Four-momentum of a photon emitted from an accretion disk
Consider a non-rotating compact object surrounded by a revolving accretion disk. A distant observer sees the disk in an edge-on position. The center of the disk may be taken as the origin of $r-\theta-...
- 329
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1
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171
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Antimatter and annihilation of light and black light
Can we annihilate a photon with an opposite phase? As two photons annihilate to give two antimatter photons (with opposite charge), these photons must have some opposite property. When these opposite ...
