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Spanish and Portuguese Relativity Meeting

22–26 Jul 2024
Europe/Lisbon timezone

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Session

Parallel Session 1 (Cosmology I)

22 Jul 2024, 14:30

Conveners

Parallel Session 1 (Cosmology I)

  • Session convener: Mar Bastero-Gil

Presentation materials

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  1. 62. A class of tilted cosmological solutions to the near equilibrium Einstein-Boltzmann system
    Michael Bradley
    22/07/2024, 14:30

    The aim of this work is to construct a class of self-consistent cosmological solutions to the combined Einstein-Boltzmann system, consisting of Einstein's equations and the Boltzmann equation. The Boltzmann equation is first rewritten in tetrad form, using a frame comoving with the fluid. In this way, the integrations with respect to the momenta become the same as in flat spacetime, and hence...

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  2. 65. New parameterisations of Dark-Energy and applications to Quintessence
    Artur Alho (CAMGSD, IST-Univ. Lisboa)
    22/07/2024, 14:45

    We introduce new parameterisations of dark-energy which continuously deform the special $\Lambda$CDM model. In addition, we provide the functional form of the parameters when dark-energy is described by thawing and tracking quintessence models.

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  3. 71. Elastic interactions in the dark sector and massive neutrinos
    DAVID FIGUERUELO HERNÁN (University of Salamanca)
    22/07/2024, 15:00

    Cosmological models that incorporate an elastic interaction within the dark sector at the linear order have emerged as a promising solution to address the σ8 tension. This interaction works by preventing the clustering of dark matter, thereby alleviating the tension. A key question in these scenarios is whether there is a potential degeneracy between this dark sector interaction and the impact...

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  4. 12. Thermodynamics of the universes admitting isotropic radiation
    Salvador Mengual Sendra (Universitat de València)
    22/07/2024, 15:15
    Talk

    The perturbation theory of the Friedmann-Lemaître-Robertson-Walker models seems to provide a good explanation of the observed degree of inhomogeneity in the universe, but the structure and evolution of galaxies, clusters, and voids require an analysis outside of the perturbative regime. They are often modeled by Newtonian N-body computations. However, the non-linear effects of the Einstein...

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  5. 8. AXIALLY SYMMETRIC RELATIVISTIC THIN DISKS AND SPHEROIDAL HALOS WITH MAGNETICALLY POLARIZED MATTER
    Guillermo A Gonzalez (Universidad Industrial de Santander)
    22/07/2024, 15:30
    Talk

    A family of relativistic models of thin disks and spheroidal haloes with magnetically polarized material source it is presented. The models are built using exact solutions of the Einstein-Maxwell equations for a conformastatic and axially symmetric spacetime, by assuming that the material content of the halo is described by a non-dissipative anisotropic fluid and that the magnetic polarization...

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  6. 83. Archimedes Experiment: the Weight of Quantum Vacuum
    Marina Esposito
    22/07/2024, 15:45

    The Archimedes experiment investigates the interaction between zero-point quantum fluctuations of the electromagnetic field and gravity, placing itself into one of the most longstanding discussions in physics: the Cosmological Constant problem.
    Using a highly sensitive suitably designed beam balance, Archimedes will measure the force exerted by the gravitational field on special samples...

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