Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The continuum limit of quantum gravity at second order in perturbation
  theory   We show that perturbative quantum gravity based on the Einstein-Hilbert
action, has a novel continuum limit. The renormalized trajectory emanates from
the Gaussian fixed point along (marginally) relevant directions but enters the
diffeomorphism invariant subspace only well below a dynamically generated
scale. We show that for pure quantum gravity to second order in perturbation
theory, and with vanishing cosmological constant, the result is the same as
computed in the standard quantisation. Although this case is renormalizable at
second order for kinematic reasons, the structure we uncover works in general.
One possibility is that gravity has a genuine consistent continuum limit even
though it has an infinite number couplings. However we also suggest a possible
non-perturbative mechanism, based on the parabolic properties of these flow
equations, which would fix all higher order couplings in terms of Newton's
constant and the cosmological constant.

35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics