Zobrazeno 1 - 10
of 58
pro vyhledávání: '"Bejarano, Cecilia"'
Autor:
Bejarano, Cecilia, Lescano, Eric
We study the inclusion of fermionic degrees of freedom and ${\cal N}=1$ supersymmetry in 4-dimensional manifolds with arbitrary torsion and non-metricity tensors deforming the connection. We inspect the closure of local diffeomorphism, Lorentz and su
Externí odkaz:
http://arxiv.org/abs/2207.12466
Publikováno v:
Phys. Rev. D 105, 084067 (2022)
We study a Born-Infeld inspired model of gravity and electromagnetism in which both types of fields are treated on an equal footing via a determinantal approach in a metric-affine formulation. Though this formulation is a priori in conflict with the
Externí odkaz:
http://arxiv.org/abs/2112.09978
Publikováno v:
Proceedings of the Sixteenth Marcel Grossmann Meeting (MG16), pages 831-839 (World Scientific, Singapore, 2023)
Within the framework of $F(R)$ theories of gravity with (2+1)-dimensions and constant scalar curvature $R$, we construct a family of thin-shell wormholes with circular symmetry and we analyze the stability of the static configurations under radial pe
Externí odkaz:
http://arxiv.org/abs/2110.06867
Publikováno v:
Eur. Phys. J. C 81, 668 (2021)
We construct a broad family of thin-shell wormholes with circular symmetry in (2+1)-dimensional F(R) theories of gravity, with constant scalar curvature R. We study the stability of the static configurations under perturbations preserving the symmetr
Externí odkaz:
http://arxiv.org/abs/2103.16482
Autor:
Bejarano, Cecilia, Delhom, Adria, Jiménez-Cano, Alejandro, Olmo, Gonzalo J., Rubiera-Garcia, Diego
Projective invariance is a symmetry of the Palatini version of General Relativity which is not present in the metric formulation. The fact that the Riemann tensor changes nontrivially under projective transformations implies that, unlike in the usual
Externí odkaz:
http://arxiv.org/abs/1907.04137
Publikováno v:
Universe 5 (2019) no.6, 158
We review the current status of the Lorentz covariance in teleparallel and modified teleparallel theories of gravity, and discuss the controversial features of the different approaches. We also revisit the issue of the remnant Lorentz gauge symmetrie
Externí odkaz:
http://arxiv.org/abs/1905.09913
Publikováno v:
Eur. Phys. J. C (2017) 77: 825
We show that McVittie geometry, which describes a black hole embedded in a FLRW universe, not only solves Einstein equations but also remains as a non-deformable solution of f(T) gravity. This search for GR solutions that survive in f(T) gravity is f
Externí odkaz:
http://arxiv.org/abs/1707.06637
We study a large family of metric-affine theories with a projective symmetry, including non-minimally coupled matter fields which respect this invariance. The symmetry is straightforwardly realised by imposing that the connection only enters through
Externí odkaz:
http://arxiv.org/abs/1705.03806
Publikováno v:
Phys. Rev. D 95, 064043 (2017)
Exploring the characterization of singular black hole spacetimes, we study the relation between energy density, curvature invariants, and geodesic completeness using a quadratic $f(R)$ gravity theory coupled to an anisotropic fluid. Working in a metr
Externí odkaz:
http://arxiv.org/abs/1702.01292
Publikováno v:
Eur. Phys. J. C (2017) 77: 776
Wormholes are hypothetical shortcuts in spacetime that in General Relativity unavoidably violate all of the pointwise energy conditions. In this paper, we consider several wormhole spacetimes that, as opposed to the standard \emph{designer} procedure
Externí odkaz:
http://arxiv.org/abs/1607.01259