 Cosmological soft-graviton consistency relation

ID: cosmological-soft-graviton-consistency-relation

For a single adiabatic long tensor mode, the squeezed scalar-scalar-graviton bispectrum is the anisotropic momentum response of the scalar power spectrum:

lim_{q \to 0} \frac{⟨ γ _{q}^{s} φ _{k} φ _{- k - q} ⟩ ^{'}}{P _{γ} ( q )} = - \frac{1}{2} ϵ_{ij}^{s} k_{i} \partial_{k_{j}} P_{φ} (k) .

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