http://arxiv.org/abs/1405.3562
The CMB anisotropy at $\ell\lsim 60$ 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 $\fnl$ in the same range of $\ell$, 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.
D. Lyth
Thu, 15 May 14
32/55
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