Reconstructing a general inflationary action

الأصل · EN

If inflation is to be considered in an unbiased way, as possibly originating from one of a wide range of underlying theories, then observations need not be simply applied to reconstructing the inflaton potential, V(ϕ), or a specific kinetic term, as in DBI inflation, but rather to reconstruct the inflationary action in its entirety. We discuss the constraints that can be placed on a general single field action from measurements of the primordial scalar and tensor fluctuation power spectra and non-Gaussianities. We also present the flow equation formalism for reconstructing a general inflationary Lagrangian, L(X,ϕ), with X=1/2∂μϕ∂μϕ, in a general gauge, that reduces to canonical and DBI inflation in the specific gauge ∂ L/∂ X = cₛ⁻¹.