Generating $\fnl$ at $\ell\lsim 60$
Cosmology and Nongalactic Astrophysics
2015-06-19 v4
Abstract
The CMB anisotropy at seems to have some special features which include (i) a dipole modulation and (ii) a decrease in power. It is known that both of these effects can be generated if a curvaton-type field has a super-horizon perturbation. It is also known that this will generate non-gaussianity in the same range of , whose magnitude has a lower bound coming from the magnitude of the observed CMB quadrupole. I revisit that bound in the present paper, and point out that it may or may not be compatible with current data which should therefore be re-analysed.
Cite
@article{arxiv.1405.3562,
title = {Generating $\fnl$ at $\ell\lsim 60$},
author = {David H. Lyth},
journal= {arXiv preprint arXiv:1405.3562},
year = {2015}
}