Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Can light curve space?

  1. Jun 3, 2012 #1
    is energy(with photonic mass)of a light beam capable of gravitationally attracting other light beam in absence of other gravity sources..
  2. jcsd
  3. Jun 3, 2012 #2

    Jonathan Scott

    User Avatar
    Gold Member

    Yes, in theory, although the effect is of course too small to be observable in any known practical case. Note however that there is no attraction between beams travelling in parallel in the same direction (but there is attraction between beams travelling in opposite direction).
  4. Jun 3, 2012 #3
    Yea i get it that its very small in magnitude..but is there any info abt what u stated..viz same direction doesn't attract and parallel attract...is there any theory for it.?
  5. Jun 3, 2012 #4
    The theory for it stems from the Einstein stress energy momentum tensor. It is the source of all gravity.
  6. Jun 3, 2012 #5
    For practical purposes no, that's something that cannot happen on any perceivable level.
  7. Jun 4, 2012 #6
    I imagine if we had billions of pulse laser beams all focused at the same point and timed so that all the photons arrived at that point simultaneously they could form a black hole without any matter being present. That would definitely curve space ;)
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook