Spanish and Portuguese Relativity Meeting

Session

Parallel session 3 (Cosmology II)

22 Jul 2024, 16:30

Conveners

Parallel session 3 (Cosmology II)

• Session convener: Javier Rubio

20. Influence of spatial curvature in particle production during the early universe

Álvaro Parra-López (IPARCOS-UCM (Complutense University of Madrid))

22/07/2024, 16:30

Observations suggest that the spatial sections of our universe are nearly flat, with spatial curvature, if present, being very small. It is proposed that any trace of curvature may have been erased during an early inflationary phase. Only at the onset of inflation, positive or negative spatial curvature may have affected spacetime dynamics. It is during this regime that cosmological particle...

73. Schwinger pair production in de Sitter: Regularizing negative conductivities

António Torres Manso (Universidad Granada)

22/07/2024, 16:45

Within the context of particle interactions during inflation, both from an inflationary but also dark sector model building perspective there is great interest in analyzing the effects of particle creation by electromagnetic fields in a de-Sitter background. Notably in the current literature, there is an open discussion arising from the appearance of negative conductivities when the masses of...

76. The inflation trilogy and primordial black hole dark matter

Paulo Ferraz

22/07/2024, 17:00

We propose an inflation scenario with three independent stages of cold, warm and thermal inflation, respectively, driven by different scalar fields, motivated by the large number of such fields predicted by most extensions of the Standard Model. We show, in particular, that the intermediate period of warm inflation naturally leads to large density fluctuations on small scales, which can lead...

78. Non-linear dynamics of axion inflation

ANDER URIO

22/07/2024, 17:15

Axion inflation is one of the leading models for a successful realization of the inflationary paradigm. I will address the issue of the strong backreaction regime in the abelian axion inflation scenario, extending results from 2303.17436 and ongoing work. I will do a revision of the mild and strong backreaction regimes, during and at the end of inflation, and also show how they can be...

58. Axion-like dark energy: late rather than early

Carlos García Boiza

22/07/2024, 17:30

Dynamical models where the dark energy component is given by a canonical scalar field are known as quintessence models. In this work, we propose an axion-like potential which emerges from physically motivated considerations. The potential naturally satisfies the necessary conditions for tracking behaviours (alleviating the cosmic coincidence problem); i.e., once we fix our potential, no matter...