Journal
PHYSICAL REVIEW D
Volume 70, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.70.083532
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We study the 3-point functions generated at recombination in the squeezed triangle limit, when one mode has a wavelength much larger than the other two and is outside the horizon. The presence of the long-wavelength mode cannot change the physics inside the horizon but modifies how a late time observer sees the anisotropies. The effect of the long-wavelength mode can be divided into a redefinition of time and spatial scales, a Shapiro time delay and gravitational lensing. The separation is gauge dependent but helps develop intuition. We show that the resulting 3-point function corresponds to an f(NL)<1 and that its shape is different from that created by the f(NL) (or local) model.
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