The consistency equation hierarchy in single-field inflation models

Abstract

Inflationary consistency equations relate the scalar and tensor perturbations. We elucidate the infinite hierarchy of consistency equations of single-field inflation, the first of which is the well-known relation A_T^2/A_S^2 = -n_T/2 between the amplitudes and the tensor spectral index. We write a general expression for all consistency equations both to first and second-order in the slow-roll expansion. We discuss the relation to other consistency equations that have appeared in the literature, in particular demonstrating that the approximate consistency equation recently introduced by Chung and collaborators is equivalent to the second consistency equation of Lidsey et al. (1997).

5 pages RevTeX

Cited by in corpus (8)

• Curvature and isocurvature perturbations from two-field inflation in a slow-roll expansion
• Reconstructing a general inflationary action
• On what scale should inflationary observables be constrained?
• Inflationary Potential Reconstruction for a WMAP Running Power Spectrum
• Cosmological constraints on general, single field inflation
• When can the Planck satellite measure spectral index running?
• The lessons from the running of the tensor-to-scalar ratio
• From WMAP to Planck: Exact reconstruction of 4- and 5-dimensional inflationary potential from high precision CMB measurements