Résumé / Abstract Seminaire_GReCO

Séminaire / Seminar GReCO

« Quantum entanglement across cosmological distances »

Suddhasattwa Brahma
Department of Physics, McGill University (Montréal, Canada)

Although inflation is accepted as the standard paradigm for early universe cosmology, many of its quantum properties remain unknown. For instance, the crowning glory of inflation lies in explaining late-time macroscopic inhomogeneities as arising from tiny quantum fluctuations; however, most of the established literature ignores the crucial role that entanglement between the modes of the fluctuating field plays in its observable predictions. In this talk, I shall discuss how treating observable long-wavelength modes as part of an open quantum system can significantly affect the dynamics (and detectable consequences) of inflation, even when considering the nonlinearities arising solely from gravity. Since these dissipative effects are at the heart of decoherence (and how quantum fluctuations turn classical), such primordial entanglement is inescapable and provides a universal smoking gun for any theory of early-universe cosmology which has a quantum origin.
lundi 25 janvier 2021 - 16:00
Institut d'Astrophysique de Paris
Pages web du séminaire / Seminar's webpage