no code implementations • 8 Jan 2021 • Weiqiang Yang, Supriya Pan, Eleonora Di Valentino, Olga Mena, Alessandro Melchiorri
Up-to-date cosmological data analyses have shown that \textit{(a)} a closed universe is preferred by the Planck data at more than $99\%$ CL, and \textit{(b)} interacting scenarios offer a very compelling solution to the Hubble constant tension.
Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology
no code implementations • 26 Sep 2020 • Eleonora Di Valentino, Olga Mena
Models involving an interaction between the Dark Matter and the Dark Energy sectors have been proposed to alleviate the long standing Hubble constant tension.
Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology
no code implementations • 6 Jul 2020 • Weiqiang Yang, Eleonora Di Valentino, Supriya Pan, Olga Mena
The Phenomenologically Emergent Dark Energy model, a dark energy model with the same number of free parameters as the flat $\Lambda$CDM, has been proposed as a working example of a minimal model which can avoid the current cosmological tensions.
Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology
1 code implementation • 19 Dec 2019 • Pablo Villanueva-Domingo, Olga Mena, Jordi Miralda-Escudé
We examine the maximum possible strength of the global 21-cm absorption dip on the Cosmic Background Radiation at high-redshift caused by the atomic intergalactic medium, when the Lyman-$\alpha$ coupling is maximum, assuming no exotic cooling mechanisms from interactions with dark matter.
Cosmology and Nongalactic Astrophysics
1 code implementation • 1 Mar 2019 • Julia Stadler, Céline Bœhm, Olga Mena
Mixed damping is a physical effect that occurs when a heavy species is coupled to a relativistic fluid which is itself free streaming.
Cosmology and Nongalactic Astrophysics
no code implementations • 2 Jun 2016 • Stefano Gariazzo, Olga Mena, Hector Ramirez, Lotfi Boubekeur
We extend an alternative, phenomenological approach to inflation by means of an equation of state and a sound speed, both of them functions of the number of $e$-folds and four phenomenological parameters.
Cosmology and Nongalactic Astrophysics
