This article will review quantum particle creation in expanding universes. The emphasis will
be on the basic physical principles and on selected applications to cosmological models …

The renormalization of the vacuum energy in quantum field theory (QFT) is usually plagued
with theoretical conundrums related not only with the renormalization procedure itself, but …

Bringing together the key ideas from nonequilibrium statistical mechanics and powerful
methodology from quantum field theory, this 2008 book captures the essence of …

I argue that cosmological data from the epoch of primordial inflation is catalyzing the
maturation of quantum gravity from speculation into a hard science. I explain why quantum …

A bstract We discuss how the moduli in modular flavor symmetric models dynamically select
enhanced symmetry points at which the residual modular symmetry renders extra matter …

Adiabatic subtraction is a popular method of renormalization of observables in quantum field
theories on a curved spacetime. When applied to the computation of the power spectra of …

We show that global de Sitter space is unstable to particle creation, even for a massive free
field theory with no self-interactions. The O (4, 1) de Sitter invariant state is a definite phase …

We develop a new regularization method for the stress-energy tensor and the two-point
function of free quantum scalar fields propagating in cosmological spacetimes. We proceed …

We consider quantum field theoretic systems subject to a time-dependent perturbation, and
discuss the question of defining a time-dependent particle number not just at asymptotic …

The Euclidean or Bunch-Davies O (4, 1) invariant state for quantum fields in global de Sitter
space is shown to be unstable to small perturbations, even for a massive free field with no …