Iarley P. Lobo
Federal University of Paraíba
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Iarley P. Lobo.
Physics Letters B | 2018
A. Sayahian Jahromi; S. A. Moosavi; H. Moradpour; J. P. Morais Graça; Iarley P. Lobo; Ines G. Salako; Abdul Jawad
Abstract Recently, the Renyi and Tsallis generalized entropies have extensively been used in order to study various cosmological and gravitational setups. Here, using a special type of generalized entropy, a generalization of both the Renyi and Tsallis entropy, together with holographic principle, we build a new model for holographic dark energy. Thereinafter, considering a flat FRW universe, filled by a pressureless component and the new obtained dark energy model, the evolution of cosmos has been investigated showing satisfactory results and behavior. In our model, the Hubble horizon plays the role of IR cutoff, and there is no mutual interaction between the cosmos components. Our results indicate that the generalized entropy formalism may open a new window to become more familiar with the nature of spacetime and its properties.
International Journal of Modern Physics D | 2018
Iarley P. Lobo; H. Moradpour; J. P. Morais Graça; Ines G. Salako
A promising theory in modifying general relativity by violating the ordinary energy-momentum conservation law in curved spacetime is the Rastall theory of gravity. In this theory, geometry and matter fields are coupled to each other in a non-minimal way. Here, we study thermodynamic properties of some black hole solutions in this framework, and compare our results with those of general relativity. We demonstrate how the presence of these matter sources may amplify effects caused by the Rastall parameter in thermodynamic quantities. Our investigation also shows that black holes with radius smaller than a certain amount (
European Physical Journal C | 2017
Iarley P. Lobo; Niccoló Loret; Francisco Nettel
equiv r_0
European Physical Journal C | 2018
J. P. Morais Graça; Iarley P. Lobo
) have negative heat capacity in the Rastall framework. In fact, it is a lower bound for the possible values of horizon radius satisfied by stable black holes.
Chinese Physics C | 2018
J. P. Morais Graça; Ines G. Salako; Iarley P. Lobo
Rainbow metrics are a widely used approach to the metric formalism for theories with modified dispersion relations. They have had a huge success in the quantum gravity phenomenology literature, since they allow one to introduce momentum-dependent space-time metrics into the description of systems with a modified dispersion relation. In this paper, we introduce the reader to some realizations of this general idea: the original rainbow metrics proposal, the momentum-space-inspired metric and a Finsler geometry approach. As the main result of this work we also present an alternative definition of a four-velocity dependent metric which allows one to handle the massless limit. This paper aims to highlight some of their properties and how to properly describe their relativistic realizations.
Physics Letters B | 2018
Iarley P. Lobo; C. Romero
The spacetime solution for a black hole, surrounded by an exotic matter field, in Rastall gravity, is calculated in an arbitrary d-dimensional spacetime. After this, we calculate the scalar quasinormal modes of such solution, and study the shift on the modes caused by the modification of the theory of gravity, i.e., by the introduction of a new term due to Rastall. We conclude that the shift strongly depends on the kind of exotic field one is studying, but for a low density matter that supposedly pervades the universe, it is unlikely that Rastall gravity will cause an instability for the probe field.
European Physical Journal C | 2018
J. P. Morais Graça; H. Moradpour; V. B. Bezerra; Iarley P. Lobo
We derive the solution for a spherically symmetric string cloud configuration in a d-dimensional spacetime in the framework of f(R) theories of gravity. We also analyze some thermodynamic properties of the joint black hole - cloud of strings solution. For its Hawking temperature, we found that the dependence of the mass with the horizon is significantly different in both theories. For the interaction of a black hole with thermal radiation, we found that the shapes of the curves are similar, but shifted. Our analysis generalizes some known results in the literature.
European Physical Journal C | 2018
H. Moradpour; S. A. Moosavi; Iarley P. Lobo; J. P. Morais Graça; Abdul Jawad; Ines G. Salako
Abstract We set observational constraints on the second clock effect, predicted by Weyl unified field theory, by investigating recent data on the dilated lifetime of muons accelerated by a magnetic field. These data were obtained in an experiment carried out in CERN aiming at measuring the anomalous magnetic moment of the muon. In our analysis we employ the definition of invariant proper time proposed by V. Perlick, which seems to be the appropriate notion to be worked out in the context of Weyl space–time.
European Physical Journal C | 2018
S. Ghaffari; H. Moradpour; Iarley P. Lobo; J. P. Morais Graça; V. B. Bezerra
We study the black hole thermodynamics in the presence of a string cloud matter distribution, considering a work term due to a variable cosmological “constant” in arbitrary dimensions. Then, we explore the criticality of the system and the behavior of the black hole as a heat engine in the context of general relativity and metric f(R) gravity.
Advances in High Energy Physics | 2018
H. Moradpour; J. P. Morais Graça; Iarley P. Lobo; Ines G. Salako
Using the first law of thermodynamics, we propose a relation between the system entropy (S) and its IR (L) and UV (