The decoherence mechanism is believed to be possibly connected to the quantum to
classical transition of the primordial cosmological perturbations in the early universe. In this …

We derive the propagator for a massless, minimally coupled scalar on a D-dimensional,
spatially flat, homogeneous and isotropic background with arbitrary constant deceleration …

We calculate the expectation value of the coincident product of two field strength tensors at
two loop order in scalar electrodynamics on de Sitter background. The result agrees with the …

For many quantum field theory computations in cosmology it is not possible to use the flat
space trick of obtaining full, interacting states by evolving free states over infinite times. State …

We apply the decoherence formalism to an interacting scalar field theory. In the spirit of the
decoherence literature, we consider a “system field” and an “environment field” that interact …

We calculate the fermion propagator in Friedmann–Lemaître–Robertson–Walker (FLRW)
spacetimes with constant deceleration for excited states. For fermions whose mass is …

A nice paper by Morrison [arXiv: 1302.1860] demonstrates the recent convergence of
opinion that has taken place concerning the graviton propagator on de Sitter background …

We investigate the gauge-invariant observables constructed by smearing the graviton and
inflaton fields by compactly supported tensors at linear order in general single-field inflation …

We show that a noncommutative structure arises naturally from perturbative quantum gravity
in a de Sitter background metric. Our work builds on recent advances in the construction of …

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 …