Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Violation of Angular Momentum Selection Rules in Quantum Gravity   A simple consequence of the angular momentum conservation in quantum field
theories is that the interference of s-channel amplitudes exchanging particles
with different spin J vanishes after complete angular integration. We show
that, while this rule holds in scattering processes mediated by a massive
graviton in Quantum Gravity, a massless graviton s-channel exchange breaks
orthogonality when considering its interference with a scalar-particle
s-channel exchange, whenever all the external states are massive. As a
consequence, we find that, in the Einstein theory, unitarity implies that
angular momentum is not conserved at quantum level in the graviton coupling to
massive matter fields. This result can be interpreted as a new anomaly,
revealing unknown aspects of the well-known van Dam - Veltman - Zakharov
discontinuity.

37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom