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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.)

Energy nonconservation as a link between f(R,T) gravity and noncommutative quantum theory

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Author(s):
Lobato, Ronaldo V. [1, 2, 3, 4] ; Carvalho, G. A. [1, 2, 3, 4] ; Martins, A. G. [5] ; Moraes, P. H. R. S. [1]
Total Authors: 4
Affiliation:
[1] Inst Tecnol Aeronaut, Dept Fis, BR-12228900 Sao Jose Dos Campos, SP - Brazil
[2] Sapienza Univ Roma, Dipartimento Fis, Ple Aldo Moro 5, I-00185 Rome - Italy
[3] Sapienza Univ Roma, ICRA, Ple Aldo Moro 5, I-00185 Rome - Italy
[4] ICRANet, Pzza Repubbl 10, I-65122 Pescara - Italy
[5] Univ Estado Para, Dept Ciencias Nat, BR-66050540 Belem, Para - Brazil
Total Affiliations: 5
Document type: Journal article
Source: EUROPEAN PHYSICAL JOURNAL PLUS; v. 134, n. 4 APR 2019.
Web of Science Citations: 0
Abstract

.f (R, T) gravity was proposed as an extension of the f(R) theories, containing not just geometrical correction terms to the General Relativity equations, but also material correction terms, dependent on the trace of the energy-momentum tensor T . These material extra terms prevent the energy-momentum tensor of the theory from being conserved, even in a flat background. Energy nonconservation is a prediction of quantum theory with time-space noncommutativity. If time is considered as an operator and there are compact spatial coordinates which do not commute with time, then the time evolution gets quantized and energy conservation can be violated. In the present work we construct a model in a 5-dimensional flat spacetime consisting of 3 commutative spatial dimensions and 1 compact spatial dimension whose coordinate does not commute with time. We show that energy flows from the 3-dimensional commutative slice into the compact extra dimension (and vice versa), so that conservation of energy is restored. In this model the energy flux is proportional to the energy density of the matter content, leading to a differential equation for f(R,T), thus providing a physical criterion to restrict the functional form of f(R,T). We solve this equation and analyze the behavior of its solution in a spherically symmetric context. (AU)

FAPESP's process: 15/08476-0 - Gravitational waves in f(R,T) theories: polarization states and astrophysical sources
Grantee:Pedro Henrique Ribeiro da Silva Moraes
Support type: Scholarships in Brazil - Post-Doctorate