Zobrazeno 1 - 10
of 280
pro vyhledávání: '"Jose Beltran"'
We compute the evolution of linear perturbations on top of a background solution of a general nonlinear electromagnetic theory. This evolution can be described in terms of two effective metrics, and we analyse under what conditions they are conformal
Externí odkaz:
http://arxiv.org/abs/2411.07898
The increasing quality of cosmological data has revealed some tensions that could be signalling the necessity of incorporating new physics into our cosmological model. One particularly intriguing possibility is the existence of elastic interactions b
Externí odkaz:
http://arxiv.org/abs/2410.18645
Scalar field theories with a shift symmetry come equipped with the $K$-mouflage (or kinetic screening) mechanism that suppresses the scalar interaction between massive objects below a certain distance, the screening radius. In this work, we study the
Externí odkaz:
http://arxiv.org/abs/2407.08627
Autor:
Bello-Morales, Antonio G., Jiménez, Jose Beltrán, Cano, Alejandro Jiménez, Maroto, Antonio L., Koivisto, Tomi S.
Theories formulated in the arena of teleparallel geometries are generically plagued by ghost-like instabilities or other pathologies that are ultimately caused by the breaking of some symmetries. In this work, we construct a class of ghost-free theor
Externí odkaz:
http://arxiv.org/abs/2406.19355
Cosmological models featuring an elastic interaction in the dark sector at linear order has been shown to provide a promising scenario for alleviating the $\sigma_8$ tension. A natural question for these scenarios is whether there could be a degenera
Externí odkaz:
http://arxiv.org/abs/2403.03216
Autor:
Taneli Heikkinen, Timo Bragge, Juha Kuosmanen, Teija Parkkari, Sanna Gustafsson, Mei Kwan, Jose Beltran, Afshin Ghavami, Srinivasa Subramaniam, Neelam Shahani, Uri Nimrod Ramírez-Jarquín, Larry Park, Ignacio Muñoz-Sanjuán, Deanna M Marchionini
Publikováno v:
PLoS ONE, Vol 16, Iss 10, p e0258486 (2021)
Huntington's disease (HD) results from an expansion mutation in the polyglutamine tract in huntingtin. Although huntingtin is ubiquitously expressed in the body, the striatum suffers the most severe pathology. Rhes is a Ras-related small GTP-binding
Externí odkaz:
https://doaj.org/article/5d08393a3e9247bea54802339f2736c8
Publikováno v:
Anal.Math.Phys. 14, 109 (2024)
Let $\mu$ be a positive finite Borel measure on $[0,1).$ Ces\`aro-type operators $C_{\mu}$ when acting on weighted spaces of holomorphic functions are investigated. In the case of bounded holomorphic functions on the unit disc we prove that $C_\mu$ i
Externí odkaz:
http://arxiv.org/abs/2401.09406
We explore the construction of four-dimensional thick branes supported by massless 3-forms in a five-dimensional bulk space. The required residual Poincar\'e symmetry on the brane is realised as a combination of the bulk symmetries and the internal g
Externí odkaz:
http://arxiv.org/abs/2312.12516
The intrinsic presence of ghosts in the symmetric teleparallel framework is elucidated. We illustrate our general arguments in $f(\mathbb{Q})$ theories by studying perturbations in the three inequivalent spatially flat cosmologies. Two of these branc
Externí odkaz:
http://arxiv.org/abs/2311.04201
General (tele)parallel Relativity, G$_\parallel$R, is the relativistic completion of Einstein's theories of gravity. The focus of this article is the derivation of the homogeneous and isotropic solution in G$_\parallel$R. The first-principles derivat
Externí odkaz:
http://arxiv.org/abs/2309.08554