Exploring the expansion of the universe using the Grüneisen parameter

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.creatorSquillante, Lucas-
Autor(es): dc.creatorGomes, Gabriel O.-
Autor(es): dc.creatorMello, Isys F.-
Autor(es): dc.creatorNogueira, Guilherme-
Autor(es): dc.creatorSeridonio, Antonio C.-
Autor(es): dc.creatorLagos-Monaco, Roberto E.-
Autor(es): dc.creatorSouza, Mariano de-
Data de aceite: dc.date.accessioned2025-08-21T15:45:12Z-
Data de disponibilização: dc.date.available2025-08-21T15:45:12Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2024-01-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.rinp.2024.107344-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/303077-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/303077-
Descrição: dc.descriptionFor a perfect fluid, pressure p and energy density ρ are related via the equation of state (EOS) ω=p/ρ, where ω is the EOS parameter, being its interpretation usually constrained to a numerical value for each universe era. Here, based on the Mie–Grüneisen EOS, we show that ω is recognized as the effective Grüneisen parameter Γeff, whose singular contribution, the so-called Grüneisen ratio Γ, 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 ω is time-dependent, which reinforces recent proposals of a time-dependent cosmological constant. Furthermore, we demonstrate that Γeff 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 accelerated-expansion, a phase transition-like behaviour can be inferred. Yet, our analysis in terms of entropy, Γ, 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 Γeff.-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionSão Paulo State University (Unesp) IGCE - Physics Department, SP-
Descrição: dc.descriptionUniversity of São Paulo Department of Astronomy-
Descrição: dc.descriptionSão Paulo State University (Unesp) Department of Physics and Chemistry, SP-
Descrição: dc.descriptionSão Paulo State University (Unesp) IGCE - Physics Department, SP-
Descrição: dc.descriptionSão Paulo State University (Unesp) Department of Physics and Chemistry, SP-
Descrição: dc.descriptionFAPESP: 2011/22050-4-
Descrição: dc.descriptionFAPESP: 2017/07845-7-
Descrição: dc.descriptionFAPESP: 2019/24696-0-
Descrição: dc.descriptionCNPq: 302887/2020-2-
Idioma: dc.languageen-
Relação: dc.relationResults in Physics-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectDark energy-
Palavras-chave: dc.subjectGrüneisen parameter-
Palavras-chave: dc.subjectUniverse expansion-
Título: dc.titleExploring the expansion of the universe using the Grüneisen parameter-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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