Photons traveling in space

  • Thread starter MeJennifer
  • Start date
  • #1
MeJennifer
2,000
5
In several posting in Special & General Relativity it is suggested that photons influence the curvature of space-time.

Now, if I understand QM correctly, a photon does not posses a definite momentum, unless it interacts. So it appears that between the times of interactions it evolves in state space but not in real space.

So then how could we possibly say that photons influence the curvature of space-time while traveling?

What am I missing?
 
Last edited:

Answers and Replies

  • #2
anantchowdhary
372
0
A photon still has energy whether it is interacting or not.So it should affect the curvature of space-time anyways isnt it?Tell me if im wrong.xD
 
  • #3
masudr
934
0
The electromagnetic field has an associated stress-energy tensor, see this Wikipedia article. If we are solving the Einstein equations and there is an EM field present, we must plug in the above tensor as [itex]T_{ab}[/itex] in addition to whatever dust there may be.

While I do not know the exact effect a single photon will have (since an EM-field is made up of many photons), classically the above approach is used.
 

Suggested for: Photons traveling in space

Replies
23
Views
2K
  • Last Post
Replies
4
Views
2K
Replies
9
Views
2K
  • Last Post
Replies
23
Views
1K
Replies
30
Views
2K
Replies
4
Views
515
Replies
1
Views
869
Replies
3
Views
2K
  • Last Post
Replies
3
Views
1K
Top