Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Can Relic Superhorizon Inhomogeneities be Responsible for Large-Scale
  CMB Anomalies?   We investigate the effects of the presence of relic classical superhorizon
inhomogeneities during inflation. This superhorizon inhomogeneity appears as a
gradient locally and picks out a preferred direction. Quantum fluctuations on
this slightly inhomogeneous background are generally statistical anisotropic.
We find a quadrupole modification to the ordinary isotropic spectrum. Moreover,
this deviation from statistical isotropy is scale-dependent, with a $\sim
-1/k^2$ factor. This result implies that the statistical anisotropy mainly
appears on large scales, while the spectrum on small scales remains highly
isotropic. Moreover, due to this $-1/k^2$ factor, the power on large scales is
suppressed. Thus, our model can simultaneously explain the observed anisotropic
alignments of the low-$\ell$ multipoles and their low power.

22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics