Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on `On quantum effects in spontaneous emission by a relativistic
  electron beam in an undulator' by G. Geloni, V. Kocharyan and E. Saldin
  (arXiv:1202.0691)   In arXiv:1202.0691, Geloni et al. criticise our recent work describing the
spontaneous emission by a relativistic, undulating electron beam. In particular
they claim that our prediction of a quantum regime in which evolution of the
electron momentum distribution occurs as a sequential population of discrete
momentum groups rather than in terms of a drift-diffusion process is unphysical
and artificial. We show that the criticism of our model contained in
arXiv:1202.0691 is unfounded.

35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol