3 papers
hep-th2021
Beyond Perturbation Theory in Inflation
Marco Celoria, Paolo Creminelli, Giovanni Tambalo +1
Inflationary perturbations are approximately Gaussian and deviations from Gaussianity are usually calculated using in-in perturbation theory. This method, however, fails for unlike…
gr-qc2019
Dark-Energy Instabilities induced by Gravitational Waves
Paolo Creminelli, Giovanni Tambalo, Filippo Vernizzi +1
We point out that dark-energy perturbations may become unstable in the presence of a gravitational wave of sufficiently large amplitude. We study this effect for the cubic Horndesk…
gr-qc2019
Resonant Decay of Gravitational Waves into Dark Energy
Paolo Creminelli, Giovanni Tambalo, Filippo Vernizzi +1
We study the decay of gravitational waves into dark energy fluctuations , taking into account the large occupation numbers. We describe dark energy using the effective field the…