Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A fresh look on the limit on ultralight axion-like particles from
  SN1987A   We revisit the limit on very light axion-like particles (ALPs) from the
absence of gamma rays coincidental with the neutrino burst from SN1987A. We use
updated supernova simulations, modern models for the magnetic field inside the
Galaxy, and a Primakoff cross section which takes into account
proton-degeneracy and mass-reduction effects. We finally give an updated
exclusion plot for the electromagnetic coupling of sub-eV ALPs, comparing our
new bound with other limits as well as with future ALP searches.

26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph