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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Reconstruction of energy conditions from observations and implications for extended theories of gravity

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Penna-Lima, M. [1, 2] ; Vitenti, S. D. P. [3, 4] ; Alves, M. E. S. [5] ; de Araujo, J. C. N. [6] ; Carvalho, F. C. [7]
Total Authors: 5
[1] Univ Brasilia, Inst Fis, Caixa Postal 04455, BR-70919970 Brasilia, DF - Brazil
[2] Univ Savoie Mont Blanc, CNRS, LAPP, IN2P3, F-74941 Annecy - France
[3] Louvain Univ, Inst Math & Phys, Ctr Cosmol Particle Phys & Phenomenol, 2 Chemin Cyclotron, B-1348 Louvain La Neuve - Belgium
[4] CNRS, GReCO, Inst Astrophys Paris, UMR7095, 98 Bis Blvd Arago, F-75014 Paris - France
[5] Univ Estadual Paulista UNESP, Inst Ciencia & Tecnol, BR-12247004 Sao Jose Dos Campos, SP - Brazil
[6] Inst Nacl Pesquisas Espaciais, Div Astrofis, Av Astronautas 1758, BR-12227010 Sao Jose Dos Campos, SP - Brazil
[7] Univ Estado Rio Grande do Norte, BR-59610210 Mossoro, RN - Brazil
Total Affiliations: 7
Document type: Journal article
Source: EUROPEAN PHYSICAL JOURNAL C; v. 79, n. 2 FEB 26 2019.
Web of Science Citations: 1

The attempt to describe the recent accelerated expansion of the Universe includes different propositions for dark energy models and modified gravity theories. Establish their features in order to discriminate and even rule out part of these models using observational data is a fundamental issue of cosmology. In the present work we consider a class of extended theories of gravity (ETG) that are minimally coupled to the ordinary matter fields. In this context, and assuming a homogeneous and isotropic spacetime, we derive the energy conditions for this ETG class. We then put constraints on these conditions using a model-independent approach to reconstruct the deceleration function along with the Joint Light-curve Analysis (JLA) supernova sample, 11 baryon acoustic oscillation and 22 cosmic-chronometer measurements. We also consider an additional condition imposing the strong energy condition only on the ordinary matter. This is to guarantee the presence of only attractive matter in the energy-momentum tensor, at least in the redshift range of the observations, i.e., the recent accelerated expansion of the Universe is due solely to the modifications in the gravity theory. The main result of this work is a general reconstruction of the energy conditions valid for every considered ETG. (AU)

FAPESP's process: 13/26258-4 - Superdense matter in the universe
Grantee:Manuel Máximo Bastos Malheiro de Oliveira
Support type: Research Projects - Thematic Grants