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Forums
Physics
Beyond the Standard Models
Flat arena for quantum gravity?
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[QUOTE="haushofer, post: 6526379, member: 20128"] Actually, background independence was not something Einstein demanded or anticipated of his theory of general relativity. It took him 2 years to appreciate this aspect of the theory. See the infamous "hole argument". Afaik it's not clear whether background independence is GR's deep lesson for quantum gravity. But e.g. in string theory it's quite odd to quantize on a flat spacetime, only to find out dozens of pages with calculations later that due to the very existence of a spin-2 oscillation and its corresponding beta-function (giving the Einstein vacuum eqns) that this is consistent to start with in the first place. For me that's a reason to suspect that string theory should be formulated in a background independent way. How? I don't know obviously. [/QUOTE]
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Beyond the Standard Models
Flat arena for quantum gravity?
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