In this paper, I briefly review the status of infrared effects which occur when using inflationary
models to calculate initial conditions for a subsequent hot, dense plasma phase. Three types …

We show that the Hartle-Hawking vacuum for any theory of interacting massive scalars on a
fixed de Sitter background is both perturbatively well defined and stable in the IR …

We consider the absorption problem for a massless scalar field propagating in static and
spherically symmetric black holes of arbitrary dimension endowed with a photon sphere. For …

We present a study of scattering of massless planar scalar waves by a charged nonrotating
black hole. Partial wave methods are applied to compute scattering and absorption cross …

A bstract Recent progress on nonlinear sigma models on de Sitter background has
permitted the resummation of large inflationary logarithms by combining a variant of …

A bstract Dependence on the graviton gauge enters the conventional effective field
equations because they fail to account for quantum gravitational correlations with the source …

We compute the one-loop fermion self-energy for massless Dirac+ Einstein in the presence
of a locally de Sitter background. We employ dimensional regularization and obtain a fully …

We construct a perturbative S-matrix for interacting massive scalar fields in global de Sitter
space. Our S-matrix is formulated in terms of asymptotic particle states in the far past and …

We study the relation between two sets of correlators in interacting quantum field theory on
de Sitter space. The first are correlators computed using in-in perturbation theory in the …

We provide a parametric representation for position-space Feynman integrals of a massive,
self-interacting scalar field in deSitter spacetime, for an arbitrary graph. The expression is …