Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Almeida, Juan P. Beltran"'
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
Autor:
Almeida, Juan P. Beltrán, Motoa-Manzano, Josué, Noreña, Jorge, Pereira, Thiago S., Valenzuela-Toledo, César A.
Publikováno v:
JCAP02(2022)018
We present an effective Eulerian description, in the non-relativistic regime, of the growth of cosmological perturbations around a homogeneous but anisotropic Bianchi I spacetime background. We assume a small deviation from isotropy, sourced at late
Externí odkaz:
http://arxiv.org/abs/2111.06756
Publikováno v:
Int. J. Mod. Phys. D 31, 2250060 (2022)
In the context of scalar-tensor theories, the inclusion of new degrees of freedom coupled non-minimally to the gravitational sector might produce some appealing effects on the cosmic expansion history. We investigate this premise by including a canon
Externí odkaz:
http://arxiv.org/abs/2103.11826
Publikováno v:
JCAP11(2020)009
We consider an UV-protected Natural Inflation scenario involving Chern-Simons-like interactions between the inflaton and some beyond the Standard Model gauge fields. The accelerated expansion of the Universe is supported by a combination of a gravita
Externí odkaz:
http://arxiv.org/abs/2007.13776
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:
Universitas Scientiarum 21(3), 219-243 (2016)
In this paper, we study the correspondence between a field theory in de Sitter space in $D$-dimensions and a dual conformal field theory in a euclidean space in $(D-1)$-dimensions. In particular, we investigate the form in which this correspondence i
Externí odkaz:
http://arxiv.org/abs/1912.06206
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
Publikováno v:
JHEP09(2019)118
We use conformal symmetry to constrain the shape of inflationary correlators in the presence of long-lived vector field perturbations. Applying conformal Ward identities, we derive general expressions, up to amplitudes and normalization factors, for
Externí odkaz:
http://arxiv.org/abs/1905.00900
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