We discuss peculiarities of quantum fields in de Sitter (dS) space on the example of the self-
interacting massive real scalar, minimally coupled to the gravity background. Nonconformal …

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 Perturbative quantum corrections to primordial power spectra are important for
testing the robustness and the regime of validity of inflation as an effective field theory …

A bstract We consider two nonlinear sigma models on de Sitter background which involve
the same derivative interactions as quantum gravity but without the gauge issue. The first …

A bstract We show that the general vacuum states that respect the de Sitter symmetry, known
as the α-vacua, can introduce non-vanishing parity-violating tensor non-Gaussianities. This …

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 We consider single graviton loop corrections to the effective field equation of a
massless, minimally coupled scalar on de Sitter background in the simplest gauge. We find …

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 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 …

Quantum theories of gravity are generally expected to have some degree of non-locality,
with familiar local physics emerging only in a particular limit. Perturbative quantum gravity …