Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Twistors from Killing Spinors alias Radiation from Pair Annihilation I:
  Theoretical Considerations   This paper is intended to be a further step through our Killing spinor
programme started with Class. Quantum Grav. \textbf{32}, 175007 (2015), and we
will advance our programme in accordance with the road map recently given in
arXiv:1611.04424v2. In the latter reference many open problems were declared,
one of which contained the uncovered relations between specific spinors in
spacetime represented by an arrow diagram built upon them. This work deals with
one of the arrows with almost all of its details and ends up with an important
physical interpretation of this setup in terms of the quantum electrodynamical
pair annihilation process. This method will shed light on the classification of
pseudo-Riemannian manifolds admitting twistors in connection with the
classification problem related to Killing spinors. Many physical
interpretations are given during the text some of which include dynamics of
brane immersions, quantum field theoretical considerations and black hole
evaporation.

21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an