A Cosmological Scenario from the Starobinsky Model within the f(R,T) Formalism

Autor(es)

Moraes, P. H. R. S. ^{[1, 2]} ; Sahoo, P. K. ^[3] ; Ribeiro, G. ^[4] ; Correa, R. A. C. ^{[1, 5]}

Afiliação do(s) autor(es)

^[1] ITA, Dept Fis, BR-12228900 Sao Jose Dos Campos, SP - Brazil

^[2] Univ Napoli Federico II UNINA, Dipartimento Fis, I-80126 Naples - Italy

^[3] Birla Inst Technol & Sci, Dept Math, Hyderabad Campus, Hyderabad 500078, Telangana - India

^[4] Univ Estadual Paulista Julio de Mesquita Filho UN, Dept Quim & Fis, BR-12516410 Guaratingueta, SP - Brazil

^[5] SISSA, Via Bonomea 265, I-34136 Trieste - Italy

• Tipo de documento: Artigo Científico
• Fonte: ADVANCES IN ASTRONOMY; v. 2019, 2019.
• Citações Web of Science: 1

Resumo

In this paper we derive a novel cosmological model from the f(R,T) theory of gravitation, for which R is the Ricci scalar and T is the trace of the energy-momentum tensor. We consider the functional form f(R,T)=f(R)+f(T), with f(R) being the Starobinsky Model, named R+R2, and f(T)=2T, with and being constants. We show that a hybrid expansion law form for the scale factor is a solution for the derived Friedmann-like equations. In this way, the model is able to predict both the decelerated and the accelerated regimes of expansion of the universe, with the transition redshift between these stages being in accordance with recent observations. We also apply the energy conditions to our material content solutions. Such an application makes us able to obtain the range of acceptability for the free parameters of the model, named and . (AU)

• Processo FAPESP: 15/08476-0 - Ondas gravitacionais em teorias f(R,T): estados de polarização e fontes astrofísicas
• Beneficiário: Pedro Henrique Ribeiro da Silva Moraes
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 16/03276-5 - Teoria geral de oscillons em cenários com violação da simetria de Lorentz, entropia configuracional e a física dos nanomateriais
• Beneficiário: Rafael Augusto Couceiro Correa
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/26646-5 - Oscillons em teorias de campo escalar
• Beneficiário: Rafael Augusto Couceiro Correa
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado