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Is Quantum Gravity a TOE

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  1. Dec 14, 2015 #1
    I'm wondering if Quantum Gravity is expected to be a Theory Of Everything (TOE)? Can we expect that if we combine QFT with GR to get Quantum Gravity, will that be a TOE that explains GR and QFT?
     
  2. jcsd
  3. Dec 14, 2015 #2
    I think is should be a candidate for a TOE, since QFT describes everything other than gravity.
    It's as likely though that it could turn out to be a theory of 'almost everything', for example it might not adequately explain dark energy.
     
  4. Dec 14, 2015 #3

    Vanadium 50

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    As of now, it's not only not a TOE, its' not even a T.
     
  5. Dec 14, 2015 #4
    It seems to me that any development of a theory assuming QFT and GR are true will not enable us to then derive either QFT or GR. We might be able to answer some questions about black holes and big bangs. But we still won't know why the universe is quantum mechanical or general relativistic. So what should we expect to find out with LQG or Stringtheory?
     
  6. Dec 19, 2015 #5
    i thought string theory can rederive GR on its own?
     
  7. Dec 20, 2015 #6
    Causal fermion system
    Here's another possibility I literally just found. I see string theory as a theory of anything, so I wonder if string theory could be used to model this "causal fermion system" as well?

    "Taking the concept seriously that the states of the Dirac sea form an integral part of the physical system, one finds that many structures (like the causal and metric structures as well as the bosonic fields) can be recovered from the wave functions of the sea states. This leads to the idea that the wave functions of all occupied states (including the sea states) should be regarded as the basic physical objects, and that all structures in space-time arise as a result of the collective interaction of the sea states with each other and with the additional particles and "holes" in the sea. Implementing this picture mathematically leads to the framework of causal fermion systems." - Putting the "darkness" of matter right in the core of its basis?
     
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