In quantum gravity the standard assumtion is that gravity is a force, although there is a small but persistent group of theorethical physicists who think otherwise.
What gives us the motivation to dismiss the graviton and go for the unortodox theories such as loop quantum gravity, causal dynamical triangulation or any emergent gravitation?
What is wrong with mass being a charge analoguosly to electromagnetism? To me it does not seem undesirable just yet. Is the non-renormalizability regarded as a technical issue or a fundamental one? Most importantly:
Is it reasonably proven(or assumed) that one cannot quantize gravity preserving Lorentz-invariance and the equivalence principle without introducing further non-quantum ugliness(such as compactified extra dimensions)?
reason for asking is:I am trying to learn the motivations for alternative theories of gravitation(those that do not contain a graviton at all)
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