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The Observed Squeezed Limit of Cosmological Three-Point Functions

of cosmological perturbation theory on these observables. This makes crucial use of Fermi Normal Coordinates and their conformal generalization, which we introduce here and discuss in detail. As an example, we apply our formalism to standard slow-roll single-eld ination. We show explicitly that Maldacena’s results for the squeezed limits of the scalar bispectrum [proportional to (ns 1) in comoving gauge] and the tensor-scalar-scalar bispectrum lead to no deviations from a Gaussian universe, except for projection eects. In particular, the primordial contributions to the squeezed CMB bispectrum and scale dependent halo bias vanish, and there are no primordial \fossil" correlations between long-wavelength tensor perturbations and small-scale perturbations. The contributions to observed correlations are then only due to projection eects such as gravitational lensing and redshift perturbations.