Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Guarnizo, Alejandro"'
Autor:
Almeida, Juan P. Beltrán, Guarnizo, Alejandro, Pereira, Thiago S., Valenzuela-Toledo, César A.
We introduce a multifield dark energy model with a nonflat field-space metric, in which one field is dynamical while the others have constant spatial gradients. The model is predictive at the background level, leading to an early dark energy componen
Externí odkaz:
http://arxiv.org/abs/2402.14108
Publikováno v:
Phys. Rev. D 102, 083507 (2020)
In this paper we study some models where non-Abelian gauge vector fields endowed with a SU(2) group representation are the unique source of inflation and dark energy. These models were first introduced under the name of gaugeflation and gaugessence,
Externí odkaz:
http://arxiv.org/abs/2007.12964
Autor:
Almeida, Juan P. Beltrán, Guarnizo, Alejandro, Heisenberg, Lavinia, Valenzuela-Toledo, César A., Zosso, Jann
Publikováno v:
Phys. Rev. D 102, 063521 (2020)
In this work we revisit the topological mass generation of 2-forms and establish a connection to the unique derivative coupling arising in the quartic Lagrangian of the systematic construction of massive $2-$form interactions, relating in this way BF
Externí odkaz:
http://arxiv.org/abs/2003.11736
Publikováno v:
The Fifteenth Marcel Grossmann Meeting. August 2022, 1197-1202
We consider a model based on $p-$form kinetic Lagrangians in the context of dark energy. The Lagrangian of the model is built with kinetic terms of the field strength for each $p$-form coupled to a scalar field $\phi$ through a kinetic function. We a
Externí odkaz:
http://arxiv.org/abs/1910.10499
Autor:
Almeida, Juan P. Beltrán, Guarnizo, Alejandro, Kase, Ryotaro, Tsujikawa, Shinji, Valenzuela-Toledo, César A.
Publikováno v:
Phys.Lett. B793 (2019) 396-404
We study the dynamics of dark energy in the presence of a 2-form field coupled to a canonical scalar field $\phi$. We consider the coupling proportional to $e^{-\mu \phi/M_{\rm pl}} H_{\alpha \beta \gamma}H^{\alpha \beta \gamma}$ and the scalar poten
Externí odkaz:
http://arxiv.org/abs/1902.05846
Autor:
Almeida, Juan P. Beltrán, Guarnizo, Alejandro, Kase, Ryotaro, Tsujikawa, Shinji, Valenzuela-Toledo, César A.
Publikováno v:
JCAP 03 (2019) 025
We study the cosmology in the presence of arbitrary couplings between $p$-forms in 4-dimensional space-time for a general action respecting gauge symmetry and parity invariance. The interaction between 0-form (scalar field $\phi$) and 3-form fields g
Externí odkaz:
http://arxiv.org/abs/1901.06097
Publikováno v:
Class. Quantum Grav. 37 (2020) 035001
In this paper we consider a model based on interacting $p-$forms and explore some cosmological applications. Restricting to gauge invariant actions, we build a general Lagrangian allowing for arbitrary interactions between the $p-$forms (including in
Externí odkaz:
http://arxiv.org/abs/1810.05301
Publikováno v:
Statistical Challenges in 21st Century Cosmology, Proceedings of the International Astronomical Union, 10, pp 347-350, 05/2014
From the galaxy power spectrum in redshift space, we derive semi-analytical results on the generic degeneracy of galaxy clustering measurements. Defining the observables $\bar{A}= Gb\sigma_8$ and $\bar{R} = Gf\sigma_8$, (being $G$ the growth function
Externí odkaz:
http://arxiv.org/abs/1406.7528
Publikováno v:
Gen. Rel. Grav. 47:109, 2015
In the context of metric $f(R)$ gravity, the Geodesic Deviation Equation (GDE) was first studied in arXiv:1010.5279v3, giving a general expression and studying a particular case, the FLRW universe. In the paper arXiv:1312.2022v1 a similar analysis wa
Externí odkaz:
http://arxiv.org/abs/1402.3196
Publikováno v:
Phys. Rev. D 89, 063538 (2014)
The effective anisotropic stress or gravitational slip $\eta=-\Phi/\Psi$ is a key variable in the characterisation of the physical origin of the dark energy, as it allows to test for a non-minimal coupling of the dark sector to gravity in the Jordan
Externí odkaz:
http://arxiv.org/abs/1311.4765