1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Quantum mechanics and relativity

  1. Apr 8, 2014 #1
    After what i have heard, General relativity and quantum mechanics can't both be correct if there is a unified theory.

    Is this because quantum entanglement propose that "something" is traveling faster than light or is it something else?
  2. jcsd
  3. Apr 8, 2014 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor

    It has nothing to do with that. Quantum entanglement does not break the speed of light because nothing is traveling! In fact, there have been several threads discussing why you cannot use this phenomenon to send faster than light signals.

    The problem arises in the difficulty we have so far to incorporate gravity into something that resembles our description of quantum field theory.

  4. Apr 8, 2014 #3
  5. Apr 8, 2014 #4


    User Avatar

    Staff: Mentor

    It might be better to say "complete" rather than "correct". Both QM and GR have proven quite capable of delivering correct results everywhere that they're applicable. A unified theory will have to agree with them everywhere that they're applicable, but will also (we hope) deliver results in areas where neither GM nor QM do so today.
  6. Apr 8, 2014 #5


    User Avatar
    Science Advisor

    The main difficulty is that where QM and GR both apply (at big bang or inside black hole) they won't work together.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook