Zobrazeno 1 - 10
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pro vyhledávání: '"Francisco S"'
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
The general-utility Markov decision processes (GUMDPs) framework generalizes the MDPs framework by considering objective functions that depend on the frequency of visitation of state-action pairs induced by a given policy. In this work, we contribute
Externí odkaz:
http://arxiv.org/abs/2409.15128
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
Autor:
Cipriano, Ricardo A. C., Ganiyeva, Nailya, Harko, Tiberiu, Lobo, Francisco S. N., Pinto, Miguel A. S., Rosa, João Luís
Publikováno v:
Universe 2024, 10(9), 339
In this work, we present a review of Energy-Momentum Squared Gravity (EMSG) -- more specifically, $f(R,T_{\mu\nu}T^{\mu\nu})$ gravity, where $R$ represents the Ricci scalar and $T_{\mu\nu}$ denotes the energy-momentum tensor. The inclusion of quadrat
Externí odkaz:
http://arxiv.org/abs/2408.14106
Autor:
Junior, Ednaldo L. B., Junior, José Tarciso S. S., Lobo, Francisco S. N., Rodrigues, Manuel E., Rubiera-Garcia, Diego, da Silva, Luís F. Dias, Vieira, Henrique A.
We consider a recently introduced extension of General Relativity dubbed as Cotton gravity (CG), based on the use of the Cotton tensor, to estimate the size of a new constant $\gamma$ appearing within a spherically symmetric, vacuum solution of the t
Externí odkaz:
http://arxiv.org/abs/2407.21655
Autor:
Junior, Ednaldo L. B., Junior, José Tarciso S. S., Lobo, Francisco S. N., Rodrigues, Manuel E., Rubiera-Garcia, Diego, da Silva, Luís F. Dias, Vieira, Henrique A.
Recently, J. Harada proposed a theory relating gravity to the Cotton tensor, dubbed as ''Cotton gravity'' (CG). This is an extension of General Relativity such that every solution of the latter turns out to be a solution of the former (but the conver
Externí odkaz:
http://arxiv.org/abs/2407.21649
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
Publikováno v:
Phys. Rev. D 110, 063502 (2024)
In this work, we construct galactic halos in order to fit the rotation curves (RCs) of a sample of low surface brightness (LSB) galaxies. These halos are made of Fuzzy Dark Matter (FDM) with a multimode expansion of non-spherical modes that in averag
Externí odkaz:
http://arxiv.org/abs/2406.17984
Publikováno v:
Phys. Lett. B 856, 138892 (2024)
This Letter aims to advance unexplored properties of a new class of Closed Timelike Curves recently discovered in scalar-tensor gravity, reported in Universe 9, 467 (2023) and Eur.$\,$Phys.$\,$J.$\,$C 83, 626 (2023). Therein, it was shown that when t
Externí odkaz:
http://arxiv.org/abs/2405.12397