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Is unification really needed?

  1. Dec 17, 2012 #1
    just came to my mind to ask: Is gravitation really a fundamental force? As far as I recall from my GR lecture, gravitation is a property of space-time. Other forces seem to be well described by the grand unified theories (GUT).

    So why is there still a need to include gravitation?

    cheers!
    :tongue2:
     
  2. jcsd
  3. Dec 17, 2012 #2

    mfb

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    2017 Award

    Staff: Mentor

    GUT is an open problem itself.
    Apart from that, you cannot simply work with quantum field theory in a curved space. Or at least it is unclear how that could be done.
     
  4. Dec 17, 2012 #3

    mathman

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    Science Advisor

    In regimes where general relativity and quantum theory are both needed (inside black holes), they are incompatible.
     
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