Zobrazeno 1 - 10
of 167
pro vyhledávání: '"Chagoya, Javier"'
We present a thorough introduction to the tools of category theory required for formulating gauge theories based on 2-connections. We provide a detailed construction of the categorical generalization of BF theory, dubbed BFCG, also known as 2BF. Simi
Externí odkaz:
http://arxiv.org/abs/2408.02889
We revisit and extend the study of null geodesics around a slowly rotating black hole in Chern-Simons modified gravity. We employ the Hamilton-Jacobi formalism to derive the equations for the shadow profile and determine its shape. We compare our res
Externí odkaz:
http://arxiv.org/abs/2403.13062
We analyze cosmography as a tool to constrain modified gravity theories. We take four distinct models and obtain their parameters in terms of the cosmographic parameters favored by observational data of strong gravitational lensing. We contrast with
Externí odkaz:
http://arxiv.org/abs/2403.09910
We apply Wald's formalism to a Lagrangian within generalised Proca gravity that admits a Schwarzschild black hole with a non-trivial vector field. The resulting entropy differs from that of the same black hole in General Relativity by a logarithmic c
Externí odkaz:
http://arxiv.org/abs/2310.20114
Publikováno v:
Class. Quantum Grav. (2024) 41 015019
The gravitational deflection of light is a critical test of modified theories of gravity. A few years ago, Gibbons and Werner introduced a definition of the deflection angle based on the Gauss-Bonnet theorem. In more recent years, Arakida proposed a
Externí odkaz:
http://arxiv.org/abs/2306.12488
In this paper we study the viability of an entropic cosmological model. The effects of entropic gravity are derived from a modified entropy-area relationship with a volumetric entropy term. This model describes a late time limit cosmic acceleration,
Externí odkaz:
http://arxiv.org/abs/2305.01607
Publikováno v:
Classical and Quantum Gravity, 2023
Rastall gravity is a modified gravity proposal that incorporates a non-conserved energy momentum tensor (EMT). We study the equivalence between Rastall gravity and general relativity, analyzing its consequences for an EMT of dark matter and dark ener
Externí odkaz:
http://arxiv.org/abs/2303.04009
Publikováno v:
Class. Quantum Grav. 40 095007 (2023)
In this paper we present a Yang-Mills type gauge theory of vector-tensor gravity, where the tetrad, the spin connection and vector field are identified with components of the gauge field. This setup leads to a theory that is contained in Generalized
Externí odkaz:
http://arxiv.org/abs/2207.06599
Publikováno v:
JCAP10(2021)022
We establish the existence of time-dependent solitons in a modified gravity framework, which is defined by the low energy limit of theories with a weakly broken galileon symmetry and a mass term. These are regular vacuum configurations of finite ener
Externí odkaz:
http://arxiv.org/abs/2108.01679
The propagation of gravitational waves offers new possibilities for testing the theory of gravity. Amongst these possibilities there is the luminosity distance of gravitational waves, $d_{gw}$. It has been proposed to study this property by means of
Externí odkaz:
http://arxiv.org/abs/2107.09143