Publications (12)32.25 Total impact
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ABSTRACT: Here, we consider a gravity theory involving a spontaneous Lorentz symmetry breaking called the bumblebee model. We show that, at certain values of the bumblebee field, the G\"odel metric is consistent within this theory.Modern Physics Letters A 07/2014; 30(02). DOI:10.1142/S021773231550011X · 1.34 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: In this work, we have considered the Ricci dark energy model, where the energy density of the universe is proportional to the Ricci scalar curvature, in the dynamic ChernSimons modified gravity. We show that in this context the evolution of the scale factor is similar to that displayed by the modified Chaplygin gas.European Physical Journal C 06/2013; 73(8). DOI:10.1140/epjc/s1005201325000 · 5.44 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We discuss the consistency of the Godel metric within the ChernSimons modified gravity, both for external and dynamical ChernSimons coefficients.03/2012; DOI:10.1142/S2010194512008367  [Show abstract] [Hide abstract]
ABSTRACT: We formulate the nonminimal aethermodified gravity whose action represents itself as a sum of the usual EinsteinHilbert action and the CPTeven Lorentzbreaking aetherlike gravity term proposed by Carroll. For this theory, we show that the G\"{o}del metric solves the modified Einstein equations under a corresponding modification of the matter, while, for the small Lorentzbreaking corrections, the matter turns out to be usual (neither ghost nor phantom one). From the other side, if the matter is suggested to be the same as in the usual general relativity, the G\"{o}del metric must be modified by additive terms proportional to the Lorentzbreaking parameter to achieve its consistency with new equations of motion. Moreover, despite such a modification turns out to be nontrivial and cannot be completely removed via change of variables, nevertheless, the closed timelike curves (CTCs) can exist for a new metric.  Physical review D: Particles and fields 09/2011; 84(6). DOI:10.1103/PhysRevD.84.069904 · 4.86 Impact Factor
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ABSTRACT: We prove the consistency of the Gödel metric with the HoravaLifshitz gravity whose action involves terms with z=1, z=2, and z=3. We show that, for different relations between the parameters of the theory, this consistency is achieved for different classes of matter; in particular, for the small cosmological constant, it is achieved only for the exotic matterthat is, ghosts or phantom matter.Physical review D: Particles and fields 08/2011; 84(4). DOI:10.1103/PhysRevD.84.047702 · 4.86 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We study the conditions for the consistency of the FriedmannRobertsonWalker (FRW) metric with the dynamical ChernSimons modified gravity. It turns out to be that in this situation the accelerated expansion of the Universe takes place, with the time dependence of the scale factor turns out to be similar to the case of presence of the Chaplygin gas. Also we found that this modification changes the total density of the Universe and therefore gives a nontrivial impact to a cosmological scenario.  [Show abstract] [Hide abstract]
ABSTRACT: We study the condition for the consistency of the G\"{o}del metric with the dynamical ChernSimons modified gravity. It turns out to be that this compatibility can be achieved only if the cosmological constant is variable in the space.Physics Letters B 04/2010; 693(4693):494497. DOI:10.1016/j.physletb.2010.09.002 · 6.02 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: In this paper we study the one and twoloop contribution to the free energy in QED with the Lorentz symmetry breaking introduced via constant CPTeven Lorentzbreaking parameters at the high temperature limit. We find the impact of the Lorentzviolating term for the free energy and carry out a numerical estimation for the Lorentzbreaking parameter. Comment: 8 pages, 3 figures, revtex4; v2: final version published in PRDPhysical review D: Particles and fields 10/2009; 81(4). DOI:10.1103/PhysRevD.81.045013 · 4.86 Impact Factor 
Article: Gödel solution in modified gravity
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ABSTRACT: We consider the modified gravity whose action represents itself as a sum of the usual EinsteinHilbert action and the gravitational ChernSimons term and show that the Gödel metric solves the modified equations of motion, thus proving that the closed timelike curves whose presence is characteristic for the Gödel solution are not forbidden in the case of the ChernSimons modified gravity as well.Physical review D: Particles and fields 07/2009; 79(12). DOI:10.1103/PHYSREVD.79.124039 · 4.86 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: In a 4D fourfermion model we study the dynamical restoration of Lorentz and CPT symmetries at finite temperature. We evaluate the gap equation both at zero and at finite temperature and observe that, depending on the parameters of the theory, there is a critical temperature at which the Lorentz and CPT symmetries are restored.  [Show abstract] [Hide abstract]
ABSTRACT: This paper has been withdrawn by the authors due to need of essential revision.
Publication Stats
44  Citations  
32.25  Total Impact Points  
Top Journals
Institutions

2011–2013

Universidade Federal de Mato Grosso (UFMT)
 Instituto de Física
Vila Real do Senhor Bom Jesus de Cuiabá, Mato Grosso, Brazil


2009

Universidade Federal da Paraíba
 Departamento de Física
João Pessoa, Estado da Paraiba, Brazil
