849 citations · 4.5k across the 60 of their papers we have counts for
9 papers · 1 filter
Stochastic eternal inflation is in the swampland
Suddhasattwa Brahma, Sarah Shandera
We demonstrate that there is no controlled description of stochastic eternal inflation consistent with the refined swampland de Sitter conjecture.
Power-counting during single-field slow-roll inflation
Peter Adshead, C. P. Burgess, R. Holman +1
We elucidate the counting of the relevant small parameters in inflationary perturbation theory. Doing this allows for an explicit delineation of the domain of validity of the semi-…
A cosmological open quantum system
Sarah Shandera, Nishant Agarwal, Archana Kamal
We derive the evolution equation for the density matrix of a UV- and IR- limited band of comoving momentum modes of the canonically normalized scalar degree of freedom in two examp…
Breakdown of Semiclassical Methods in de Sitter Space
C. P. Burgess, R. Holman, L. Leblond +1
Massless interacting scalar fields in de Sitter space have long been known to experience large fluctuations over length scales larger than Hubble distances. A similar situation ari…
Super-Hubble de Sitter Fluctuations and the Dynamical RG
C. P. Burgess, L. Leblond, R. Holman +1
Perturbative corrections to correlation functions for interacting theories in de Sitter spacetime often grow secularly with time, due to the properties of fluctuations on super-Hub…
Simple Bounds from the Perturbative Regime of Inflation
Louis Leblond, Sarah Shandera
We examine the conditions under which a perturbative expansion around an inflating background is valid. When inflation is driven by a single field with a general sound speed, we fi…