Zobrazeno 1 - 10
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pro vyhledávání: '"Elizalde, E."'
In this work, we propose a model of Einstein--Gauss-Bonnet gravity coupled with two scalar fields. The two scalar fields are considered to be ``frozen'' or they become non-dynamical by employing appropriate constraints in terms of Lagrange multiplier
Externí odkaz:
http://arxiv.org/abs/2312.02889
Autor:
Costantini, A., Elizalde, E.
An extension of unimodular Einsteinian gravity in the context of $F(R)$ gravities is used to construct a class of anisotropic evolution scenarios. In unimodular GR the determinant of the metric is constrained to be a fixed number or a function. Howev
Externí odkaz:
http://arxiv.org/abs/2212.02568
This article studies the effects of an arbitrary dark matter spin tensor on the propagation of gravitational wave amplitude in the context of Einstein-Cartan theory. We choose to work with an arbitrary spin tensor because, given our ignorance of the
Externí odkaz:
http://arxiv.org/abs/2204.00090
Publikováno v:
In Physics of the Dark Universe July 2024 45
We investigate the generation of magnetic fields from inflation, which occurs via breakdown of the conformal invariance of the electromagnetic (EM) field, when coupled with the Ricci scalar and the Gauss-Bonnet invariant. For the case of instantaneou
Externí odkaz:
http://arxiv.org/abs/2012.12742
Autor:
Navó, G., Elizalde, E.
The stability of two different bounce scenarios from F(R,G) modified gravity at later times is studied, namely a hyperbolic cosine bounce model and a matter-dominated one. After describing the main characteristics of F(R,G) modified gravity, the two
Externí odkaz:
http://arxiv.org/abs/2007.11507
In the context of a ghost free $f(R,\mathcal{G})$ model, an extended matter bounce scenario is studied where the form of the scale factor is given by $a(t) = (a_0t^2 + 1)^n$. The ghost free character of the model is ensured by the presence of a Lagra
Externí odkaz:
http://arxiv.org/abs/2003.04264
Publikováno v:
Eur. Phys. J. C (2020) 80:109
Novel static black hole solutions with electric and magnetic charges are derived for the class of modified gravities: $f({\cal R})={\cal R}+2\beta\sqrt{{\cal R}}$, with or without a cosmological constant. The new black holes behave asymptotically as
Externí odkaz:
http://arxiv.org/abs/2001.11357
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