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  How closely can string theory mimic asymptotic safety for gravity?

+ 4 like - 0 dislike

Asymptotic safety in quantum gravity has various problems, but (as I see it) it has two points in its favor.

First, the hypothesis has apparently passed a significant test which skeptics predicted it would fail (see the 2016 paper cited by Arnold Neumaier).

Second, it was successfully employed to predict the mass of the Higgs boson. As Daniel de França ("MTd2") has remarked, that might be the first confirmed prediction of a quantum gravitational theory!

So I am wondering whether string theory can mimic asymptotic safety. For example, could there be a stringy regime in which gravity is described by one of the truncations of Einstein gravity that has been shown to be asymptotically safe?

This post imported from StackExchange Physics at 2017-01-17 14:08 (UTC), posted by SE-user Mitchell Porter
asked Jan 13, 2017 in Theoretical Physics by Mitchell Porter (1,950 points) [ no revision ]
retagged Jan 17, 2017

The 2016 paper mentioned is 

http://arxiv.org/abs/1601.01800 The Gravitational Two-Loop Counterterm is Asymptotically Safe

Strings are considered to be a "UV completion" of QFT, see the clip from a D. Gross talk. In my humble opinion, there might be many "UV completions"; thus strings may not be the ultimate possibility.

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