| Texto completo | |
| Autor(es): |
Squillante, Lucas
;
Gomes, Gabriel O.
;
Mello, Isys F.
;
Nogueira, Guilherme
;
Seridonio, Antonio C.
;
Lagos-Monaco, Roberto E.
;
de Souza, Mariano
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | RESULTS IN PHYSICS; v. 57, p. 7-pg., 2024-01-17. |
| Resumo | |
For a perfect fluid, pressure p and energy density p are related via the equation of state (EOS) w = p/p, where w is the EOS parameter, being its interpretation usually constrained to a numerical value for each universe era. Here, based on the Mie-Gruneisen EOS, we show that w is recognized as the effective Gruneisen parameter f.f f, whose singular contribution, the so-called Gruneisen ratio 1.', quantifies the barocaloric effect. Our analysis suggests that the negative p associated with dark -energy implies a metastable state and that in the dark-energy-dominated era w is time -dependent, which reinforces recent proposals of a time -dependent cosmological constant. Furthermore, we demonstrate that f.f f is embodied in the energy-momentum stress tensor in the Einstein field equations, enabling us to analyse, in the frame of an imperfect fluid picture, anisotropic effects of the universe expansion. We propose that upon going from decelerated- to acceleratedexpansion, a phase transition-like behaviour can be inferred. Yet, our analysis in terms of entropy, 1.', and a by us adapted version of Avramov/Casalini's model to Cosmology unveil hidden aspects related to the expansion of the universe. Our findings pave the way to interpret cosmological phenomena in connection with concepts of condensed matter Physics via r.ff. (AU) | |
| Processo FAPESP: | 11/22050-4 - Investigação das propriedades termodinâmicas e de transporte de sistemas eletrônicos fortemente correlacionados |
| Beneficiário: | Valdeci Pereira Mariano de Souza |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |