201 citations · 1.8k across the 54 of their papers we have counts for
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Stochastic Inflation in Numerical Relativity
Yoann L. Launay, Gerasimos I. Rigopoulos, E. Paul S. Shellard
A set of 3+1 equations for stochastic inflation incorporating all metric and scalar matter degrees of freedom, first presented in previous work, are re-derived in a gauge invariant…
Inflaton perturbations through an Ultra-Slow Roll transition and Hamilton-Jacobi attractors
Tomislav Prokopec, Gerasimos Rigopoulos
We examine the behaviour of the gauge invariant scalar field perturbations in an analytic inflationary model that transitions from slow-roll to an ultra-slow-roll (USR) phase. We f…
Bunch-Davies initial conditions and non-perturbative inflationary dynamics in Numerical Relativity
Yoann L. Launay, Gerasimos I. Rigopoulos, E. Paul S. Shellard
We show that it is possible to simulate realistic inhomogeneities during cosmological inflation with high precision using {Numerical Relativity}. Stochastic initial conditions are…
Quantitative classicality in cosmological interactions during inflation
Yoann L. Launay, Gerasimos I. Rigopoulos, E. Paul S. Shellard
We examine the classical and quantum evolution of inflationary cosmological perturbations from quantum initial conditions, using the on-shell and off-shell contributions to correla…
Stochastic Inflation in General Relativity
Yoann L. Launay, Gerasimos I. Rigopoulos, E. P. S. Shellard
We provide a formulation of Stochastic Inflation in full general relativity that goes beyond the slow-roll and separate universe approximations. We show how gauge invariant Langevi…
Observational constraints on Hyperinflation
Marios Bounakis, Ian G. Moss, Gerasimos Rigopoulos
We study a Hyperinflation model involving a field doublet on a hyperbolic field-space manifold and an exponential potential, providing a concise treatment of the evolution of the e…