Zobrazeno 1 - 10
of 91
pro vyhledávání: '"Guimarães, M. E. X."'
Publikováno v:
Journal of High Energy Physics, Gravitation and Cosmology 2021
The formation and evolution of cosmic string wakes in the framework of a $f(R)$ theory of gravity are investigated in this work. We consider a simple model in which baryonic matter flows past a cosmic string. We treat this problem in the Zel'dovich a
Externí odkaz:
http://arxiv.org/abs/2110.02353
Publikováno v:
Eur. Phys. J. C 77, 848 (2017)
Observation shows that the velocities of stars grow by approximately 2 to 3 orders of magnitude when the distances from the centers of the galaxies are in the range of $0.5$ kpc to $82.3$ kpc, before they begin to tend to a constant value. Up to know
Externí odkaz:
http://arxiv.org/abs/1712.03054
We analyze the thermodynamics of a black hole in a region that contains a global monopole in the framework of a particular class of a f(R) gravity. Specifically, we study the case in which df(R)/dR = F(R) is a power law function of the radial coordin
Externí odkaz:
http://arxiv.org/abs/1510.08176
We apply the methods of homology and K-theory for branes wrapping spaces stratified fibered over hyperbolic orbifolds. In addition, we discuss the algebraic K-theory of any discrete co-compact Lie group in terms of appropriate homology and Atiyah-Hir
Externí odkaz:
http://arxiv.org/abs/1408.1071
We analyse the role of vertex operator algebra and 2d amplitudes from the point of view of the representation theory of infinite dimensional Lie algebras, MacMahon and Ruelle functions. A p-dimensional MacMahon function is the generating function of
Externí odkaz:
http://arxiv.org/abs/1405.4717
We discuss the homological aspects of the connection between quantum string generating function and the formal power series associated to the dimensions of chains and homologies of suitable Lie algebras. Our analysis can be considered as a new straig
Externí odkaz:
http://arxiv.org/abs/1403.7139
Publikováno v:
Phys. Rev. D 87, 106011 (2013)
The viability of achieving gravitational consistent braneworld models in the framework of a f(R) theory of gravity is investigated. After a careful generalization of the usual junction conditions encompassing the embedding of the 3-brane into a f(R)
Externí odkaz:
http://arxiv.org/abs/1205.4980
Publikováno v:
Mod. Phys. Lett. A, Vol. 27, No. 30 (2012) 1250177
In this paper we suggest an approach to analyse the motion of a test particle in the spacetime of a global monopole within a $f(R)$-like modified gravity. The field equations are written in a more simplified form in terms of $F(R)=\frac{df(R)}{dR}$.
Externí odkaz:
http://arxiv.org/abs/1111.1856
Publikováno v:
International Journal of Modern Physics: Conference Series, v. 03, p. 446-454, 2011
In this paper we analyze the gravitational field of a global monopole in the context of $f(R)$ gravity. More precisely, we show that the field equations obtained are expressed in terms of $F(R)=\frac{df(R)}{dR}$. Since we are dealing with a spherical
Externí odkaz:
http://arxiv.org/abs/1106.4033
Publikováno v:
JHEP 1009:051,2010
In this work, we review and extend the so-called consistency conditions for the existence of a braneworld scenario in arbitrary dimensions in the Brans-Dicke (BD) gravitational theory. After that, we consider the particular case of a five-dimensional
Externí odkaz:
http://arxiv.org/abs/1001.1075