Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photon-photon scattering from a UV-complete gravity QFT   Quantum quadratic gravity (QQG) produces a tree-level differential cross
section for $\gamma\gamma\to\gamma\gamma$ that is well-behaved at all energies.
From this we can study how the corrections to low energy scattering amplitudes
are related to the UV physics, in particular to the exchange of the massive
graviparticles. An effective forward scattering amplitude is obtained by
separating out the effects of the $t$-channel graviton pole. This is possible
due to the UV-completeness, and even though the Froissart bound is not
satisfied. We then consider photon-photon scattering to two graviparticles and
a further imaginary contribution to the $\gamma\gamma\to\gamma\gamma$ forward
scattering amplitude. Unitarity without positivity is a key property of QQG and
it impacts all our results.

1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an