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Universidad de Granada CAFPE

Seminario: Inflation in anisotropic spacetimes: one step furhter in the understanding of the physics of the early universe

Ponente: Javier Olmedo, University of Lousiana

Lugar: Seminario del Dpto Física Teórica y del Cosmos

Fecha: 15/10/2019

Hora (24h): 16:00

Resumen:
The paradigm of slow-roll inflation provides a picture of the early universe that is in good agreement with present observations. Despite its success, most of the models studied so far rely heavily on the assumption that the universe is perfectly isotropic at early times (cosmological principle). In this talk, I will discuss recent advances in the gauge-invariant formulation of cosmological perturbations in some suitable anisotropic Bianchi I spacetimes and their Fock quantization, with a special interest in the paradigm of inflation. In those scenarios where the universe is anisotropic at early times, in spite anisotropies die out very rapidly just before the inflationary expansion, cosmological perturbations can actually keep memory of that anisotropic phase and potentially leave anomalies in the Cosmic Microwave Background (CMB). With these imprints and current data we can constrain the departure from spatial isotropy of the early universe, as well as they can produce angular correlation functions that are otherwise forbidden in the standard isotropic scenario. I will finally discuss its consequences for present and future observations of the CMB.