Photons effected by gravity of a Blackhole?

  • #1
Hello,

New to this forum. Very fascinated with physics. Started as a fascination with waveforms, sound, acoustics, and quickly spiraled into an infinite fascination with physics in general, specially particle physics at a quantum level and general relativity at a cosmic level and nuclear chemistrty in stars.

Anyways, bla bla bla about me here is a question I have been hung up on for many months.

I read very many books and no matter how many times I have it explained and how many examples I see I do not get this:

How does a blackhole "pull" in photons? I currently understand that we observe mass to attract mass and we call it gravity. SO how can a blackhole use gravity to pull on massless particles such as the photon.

Vice versa: how does a massless particle such as a photon "push" on massive particles such as gas clouds in space.

why do photons seem to act like massive particles.

I have many more questions in this same scope but do not want to waste your time by listing them one by one in this thread. I came here because I am absolutely entranced by physics and want to increase my understanding. I want to visualize these things in my head.

Anyways, if this would be more appropriate in another forum please move it. Links to similar threads would be appreciated if you think it would answer my question. Thank you to anybody who reads my post and thank you to anyone that sheds some light (no pun intended) on the situation.
 

Answers and Replies

  • #2
1,538
0
How does a blackhole "pull" in photons?
The mass of the black hole curves spacetime, this influences all objects. So also objects that have no mass!

I currently understand that we observe mass to attract mass and we call it gravity.
Mass certainly attracts other masses but it also attracts massless things.

Mass curves spacetime, so two masses, in general (it's not linear), curve spacetime even more. But the attraction is due to the curvature, and the attraction applies to all objects, also objects that have no mass.
 
  • #3
769
38
You might want to check the Frequently Asked Relativity Questions sub-forum:
https://www.physicsforums.com/forumdisplay.php?f=210 [Broken]

How does a blackhole "pull" in photons? I currently understand that we observe mass to attract mass and we call it gravity. SO how can a blackhole use gravity to pull on massless particles such as the photon.
https://www.physicsforums.com/showthread.php?t=511173


how does a massless particle such as a photon "push" on massive particles such as gas clouds in space.
https://www.physicsforums.com/showthread.php?t=512541
 
Last edited by a moderator:
  • #4
This is awesome. Thank you for these answers and these links.
 

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