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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.)

Cosmological constant constraints from observation-derived energy condition bounds and their application to bimetric massive gravity

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Alves, M. E. S. [1] ; Carvalho, F. C. [2] ; de Araujo, J. C. N. [3] ; Penna-Lima, M. [4, 5, 6] ; Vitenti, S. D. P. [7, 8]
Total Authors: 5
[1] Univ Estadual Paulista, UNESP, Inst Ciencia & Tecnol, BR-12247004 Sao Jose Dos Campos, SP - Brazil
[2] Univ Estado Rio Grande do Norte, BR-59610210 Mossoro, RN - Brazil
[3] Inst Nacl Pesquisas Espaciais, Div Astrofis, Av Astronautas 1758, BR-12227010 Sao Jose Dos Campos, SP - Brazil
[4] Ctr Brasileiro Pesquisas Fis, Rua Dr Xavier Sigaud 150, BR-22290180 Rio De Janeiro, RJ - Brazil
[5] Univ Savoie Mt Blanc, LAPP, CNRS, IN2P3, F-74941 Annecy - France
[6] Univ Brasilia, Inst Fis, Caixa Postal 04455, BR-70919970 Brasilia, DF - Brazil
[7] Louvain Univ, Inst Math & Phys, Ctr Cosmol Particle Phys & Phenomenol, 2 Chemin Cyclotron, B-1348 Louvain La Neuve - Belgium
[8] CNRS, UMR7095, GReCO, Inst Astrophys Paris, 98 Bis Blvd Arago, F-75014 Paris - France
Total Affiliations: 8
Document type: Journal article
Source: EUROPEAN PHYSICAL JOURNAL C; v. 78, n. 9 SEP 4 2018.
Web of Science Citations: 3

Among the various possibilities to probe the theory behind the recent accelerated expansion of the universe, the energy conditions (ECs) are of particular interest, since it is possible to confront and constrain different theories of gravity with observational data. In this context, we use the ECs to probe any alternative theory of gravity whose extra term acts as a cosmological constant. For this purpose, we apply a model-independent approach to reconstruct the recent expansion of the universe. Using Type Ia supernova, baryon acoustic oscillations and cosmic-chronometer data, we perform a Markov Chain Monte Carlo analysis to put constraints on the effective cosmological constant Omega(0)(eff). In addition, we find out that about 30% of the posterior distribution is incompatible with a cosmological constant, showing that this method can potentially rule it out as a mechanism for the accelerated expansion. We also study the consequence of these constraints for two particular formulations of the massive gravity in a scenario where both theories mimic General Relativity with a cosmological constant. Using the Omega(0)(eff) observational bounds along with the upper bounds on the graviton mass we obtain constraints on the parameter spaces of both theories. (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