A bstract We consider the classical attractor regime of the spectator Abelian Higgs model in
power-law inflation, and compute the one-loop corrections to its evolution. For computations …

Just because the propagator of some field obeys a de Sitter invariant equation does not
mean it possesses a de Sitter invariant solution. The classic example is the propagator of a …

In this paper we study a massless, minimally coupled scalar field in a Friedmann-Lemaître-
Robertson-Walker space-time with periods of different constant deceleration parameter. We …

We discuss several aspects of quantum field theory of a scalar field in a Friedmann
universe.(i) We begin by showing that it is possible to map the dynamics of a scalar field with …

The quantum theory of cosmological perturbations in single-field inflation is formulated in
terms of a path integral. Starting from a canonical formulation, we show how the free …

We expound ten principles in an attempt to clarify the debate over infrared loop corrections
to the primordial scalar and tensor power spectra from inflation. Among other things we note …

We consider the late-time one-loop quantum backreaction from inflationary fluctuations of a
nonminimally coupled, massless scalar field. The scalar is assumed to be a spectator field in …

The semiclassical gravity describes gravitational backreactions of the classical spacetime
interacting with quantum matter fields, but the quantum effects on the background are …

The instability of (quasi) de Sitter spacetime from quantum gravitational effects has been
discussed in many works. Especially, the gravitational backreaction from quantum energy …

In this paper we consider a massless scalar field, with a possible coupling ξ to the Ricci
scalar in a D dimensional Friedmann-Lemaître-Robertson-Walker space-time with a …