Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Violations of discrete space-time symmetries in chiral effective field
  theory   We review recent progress in the theoretical description of the violation of
discrete space-time symmetries in hadronic and nuclear systems. We focus on
parity-violating and time-reversal-conserving interactions which are induced by
the Standard Model weak interaction, and on parity- and time-reversal-violating
interactions which can be caused by a nonzero QCD theta term or by
beyond-the-Standard Model physics. We discuss the origins of such interactions
and review the development of the chiral effective field theory extension that
includes discrete symmetry violations. We discuss the construction of
symmetry-violating chiral Lagrangians and nucleon-nucleon potentials and their
applications in few-body systems.

7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga