Zobrazeno 1 - 10
of 471
pro vyhledávání: '"Nascimento, J. R."'
We formulate a new class of modified gravity models, that is, generalized four-dimensional Chern-Pontryagin models, whose action is characterized by an arbitrary function of the Ricci scalar $R$ and the Chern-Pontryagin topological term ${}^*RR$, i.e
Externí odkaz:
http://arxiv.org/abs/2407.01453
In this paper, we study the one-loop effective potential of a derivative four-fermion model. As a result, an exact bumblebee-like potential is radiatively generated. Afterwards, we generalize our study for a finite temperature case and explicitly dem
Externí odkaz:
http://arxiv.org/abs/2406.12987
Publikováno v:
Physics of the Dark Universe, 2024, 101630
In this study, we investigate the signatures of a non-commutative black hole solution. Initially, we calculate the thermodynamic properties of the system, including entropy, heat capacity, and Hawking radiation. For the latter quantity, we employ two
Externí odkaz:
http://arxiv.org/abs/2406.12015
This paper explores the renormalization of scale-free quadratic gravity coupled to the bumblebee field and its potential for dynamically breaking Lorentz symmetry. We conduct one-loop renormalization of the model and calculate the associated renormal
Externí odkaz:
http://arxiv.org/abs/2406.08309
Quantum photon effects in vacuum provide an interesting setting to test quantum electrodynamics, serving as a source for predictions about physics beyond the Standard Model. In this paper, we investigate these effects by calculating the one-loop Eule
Externí odkaz:
http://arxiv.org/abs/2405.20855
In this work, we study the gravitational lensing by a Lorentz-violating (LV) black hole inspired by the recent contribution [1]. Explicitly, we concentrate on a specific application: we perform the computation of gravitational lensing effects under t
Externí odkaz:
http://arxiv.org/abs/2404.04176
In this paper, we consider the coupling of the metric-affine bumblebee gravity to the Abelian gauge field and obtain the effective model corresponding to the weak gravity limit of this theory. The effective bumblebee theory displays new unconventiona
Externí odkaz:
http://arxiv.org/abs/2402.17605
Publikováno v:
JCAP07(2024)004
Within the framework of the spontaneous Lorentz symmetry breaking, we consider a metric--affine generalization of the gravitational sector of the Standard--Model Extension (SME), including the Lorentz--violating (LV) coefficients $u$ and $s^{\mu\nu}$
Externí odkaz:
http://arxiv.org/abs/2402.13014
Publikováno v:
Phys. Lett. B850, 138519 (2024)
In this study, we systematically calculate one-loop corrections to the Lorentz-violating vertices within the framework of CPT-odd Quantum Electrodynamics, encompassing scalar and photon fields in arbitrary gauge. Additionally, we ascertain the finite
Externí odkaz:
http://arxiv.org/abs/2310.15715
Publikováno v:
Phys. Lett. B845, 138141 (2023)
In this paper, we demonstrate the possibility of generating a non-Abelian Carroll-Field-Jackiw (CFJ) term in the theory of a non-Abelian gauge field coupled to a spin-3/2 field in the presence of the constant axial vector field. Applying two regulari
Externí odkaz:
http://arxiv.org/abs/2308.16308