Spacetime correlators of perturbations in slow-roll de Sitter inflation

Understand

Two-point correlators and self-correlators of primordial perturbations in quasi-de Sitter spacetime backgrounds are considered.

• For large separations two-point correlators exhibit nearly scale invariance, while for short distances self-correlators need standard renormalization.
• We study the deformation of two-point correlators to smoothly match the self-correlators at coincidence.
• The corresponding angular power spectrum is evaluated in the Sachs-Wolfe regime of low multipoles.