Zobrazeno 1 - 10
of 131
pro vyhledávání: '"MIMOSO, JOSÉ P."'
Publikováno v:
Entropy 26(11), 947 (2024)
This review delves into the pivotal primordial stage of the universe, a period that holds the key to understanding its current state. To fully grasp this epoch, it is essential to consider three fundamental domains of physics: gravity, particle physi
Externí odkaz:
http://arxiv.org/abs/2411.03018
We investigate the phenomenon of gravitational baryogenesis within the context of a specific modified theory of gravity, namely, energy-momentum squared gravity or $f(R, T_{\mu\nu}T^{\mu\nu})$ gravity. In this framework, the gravitational Lagrangian
Externí odkaz:
http://arxiv.org/abs/2409.04623
Publikováno v:
Symmetry 16, 881 (2024)
Since the development of Brans-Dicke gravity, it has become well-known that a conformal transformation of the metric can reformulate this theory, transferring the coupling of the scalar field from the Ricci scalar to the matter sector. Specifically,
Externí odkaz:
http://arxiv.org/abs/2407.08320
We explore in detail the 2+2 and 1+1+2 formalism in spherically symmetric spacetimes, spanning from deducing the dynamical equations to relating them to the well-known generalised Painlev\'e-Gullstrand (GPG) coordinate system. The evolution equations
Externí odkaz:
http://arxiv.org/abs/2405.09968
Publikováno v:
Symmetry 16, 13 (2024)
In this review article, we revisit the topic of baryogenesis, which is the physical process that generated the observed baryon asymmetry during the first stages of the primordial Universe. A viable theoretical explanation to understand and investigat
Externí odkaz:
http://arxiv.org/abs/2312.14080
Autor:
Sakr, Ziad, Carvalho, Ana, Da Silva, Antonio, Bellido, Juan Garcia, Mimoso, Jose P., Camarena, David, Nesseris, Savvas, Martins, Carlos J. A. P., Nunes, Nelson J., Sapone, Domenico
The Universe's assumed homogeneity and isotropy is known as the cosmological principle. It is one of the assumptions that lead to the Friedmann-Lema\^{\i}tre-Robertson-Walker (FLRW) metric and it is a cornerstone of modern cosmology, because the metr
Externí odkaz:
http://arxiv.org/abs/2309.17151
We study a model of Symmetric Teleparallel gravity that is able to account for the current accelerated expansion of the universe without the need for dark energy component. We investigate this model by making use of dynamical system analysis techniqu
Externí odkaz:
http://arxiv.org/abs/2306.10176
Publikováno v:
Eur. Phys. J. C (2023) 83:433
We propose a new formulation of $f(R)$ gravity, dubbed scalarized $f(R)$ gravity, in which the Legendre transform is included as a dynamical term. This leads to a theory with second-order field equations that describes general relativity with a self-
Externí odkaz:
http://arxiv.org/abs/2305.04011
Publikováno v:
Eur. Phys. J. C 83, 735 (2023)
We discuss implications of the cosmological frame principle which states that cosmological effects of modified gravity must be stable as solutions of each of the corresponding sets of dynamical equations holding in the two conformally-related frames.
Externí odkaz:
http://arxiv.org/abs/2304.12733
Publikováno v:
Universe 2024, 10, 162
Redshift drift is the phenomenon whereby the observed redshift between an emitter and observer comoving with the Hubble flow in an expanding FLRW universe will slowly evolve -- on a timescale comparable to the Hubble time. In a previous article [JCAP
Externí odkaz:
http://arxiv.org/abs/2210.13946