Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Variation of the fine structure constant in QSO spectra from coherent
  dark matter oscillations   We consider the problem of the evolution of the fine structure coefficient
alpha under the assumption that the scalar field coupling to the Maxwell term
satisfies the condition mt>>1 for coherent dark matter oscillations. In this
case we find that the coupling scale f in the leading order coupling
-(phi/4f)F^2 affects the cosmological evolution of alpha according to
ln(alpha/alpha_0) xi(m_{Pl}/f)ln(tanh(t/2 tau)/tanh(t_0/2 tau)). A fit to the
QSO observations by Murphy et al. yields f/xi= 2.12^{+0.58}_{-0.37} 10^5m_{Pl}.
Here m_{Pl} is the reduced Planck mass, and xi^2=rho_phi/rho_m parametrizes the
contribution of phi to the matter density in the universe.

17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio