Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: More on Weinberg's No Go Theorem in Quantum Gravity   We complement Weinberg's no go theorem on the cosmological constant problem
in quantum gravity by generalizing it to the case of a scale-invariant theory.
Our analysis makes use of the effective action and the BRST symmetry in a
manifestly covariant quantum gravity instead of the classical Lagrangian
density and the $GL(4)$ symmetry in classical gravity. In this sense, our proof
is very general since it does not depend on details of quantum gravity and
holds true for general gravitational theories which are invariant under
diffeomorphisms. As an application of our theorem, we comment on an idea that
in the asymptotic safety scenario the functional renormalization flow drives a
cosmological constant to zero, solving the cosmological constant problem
without reference to fine tuning of parameters. Finally, we also comment on the
possibility of extending the Weinberg theorem in quantum gravity to the case
where the translational invariance is spontaneously broken.

31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org