Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 11, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2011/11/038
Keywords
inflation; cosmological parameters from LSS; non-gaussianity
Funding
- James Arthur Fellowship
- FP7- IDEAS [Phys.LSS 240117]
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We prove that, in a generic single-field model, the consistency relation for the 3-point function in the squeezed limit receives corrections that vanish quadratically in the ratio of the momenta, i.e. as (k(L)/k(S))(2). This implies that a detection of a bispectrum signal going as 1/K-L(2) in the squeezed limit, that is suppressed only by one power of k(L) compared with the local shape, would rule out all single-field models. The absence of this kind of terms in the bispectrum holds also for multifield models, but only if all the fields have a mass much smaller than H. The detection of any scale dependence of the bias, for scales much larger than the size of the haloes, would disprove all single-field models. We comment on the regime of squeezing that can be probed by realistic surveys.
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