Výsledky vyhledávání - "R. R. Cuzinatto"

Akademický článek

Bopp–Podolsky black holes and the no-hair theorem

Autor: R. R. Cuzinatto, C. A. M. de Melo, L. G. Medeiros, B. M. Pimentel, P. J. Pompeia

Publikováno v: European Physical Journal C: Particles and Fields, Vol 78, Iss 1, Pp 1-9 (2018)

Abstract Bopp–Podolsky electrodynamics is generalized to curved space-times. The equations of motion are written for the case of static spherically symmetric black holes and their exterior solutions are analyzed using Bekenstein’s method. It is s

Externí odkaz: https://doaj.org/article/e4d51121892145a3a74497ecf66f8ffa

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Testing a varying-Λ model for dark energy within co-varying physical couplings framework

Autor: R R Cuzinatto, R P Gupta, R F L Holanda, J F Jesus, S H Pereira

Publikováno v: Monthly Notices of the Royal Astronomical Society. 515:5981-5992

The Co-varying Physical Couplings (CPC) framework is a modified gravity set up assuming Einstein Field Equations wherein the quantities $\{G,c,\Lambda\}$ are promoted to space-time functions. Bianchi identity and the requirement of stress-energy tens

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2033e4e9d2c8ed001b861beeb228105e
https://doi.org/10.1093/mnras/stac2039

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Observational constraints on varying fundamental constants in a minimal CPC model

Autor: R R Cuzinatto, R F L Holanda, S H Pereira

A minimal model based on the Co-varying Physical Couplings (CPC) framework for gravity is proposed. The CPC framework is based on the assumptions of a metric-compatible four-dimensional Riemannian manifold where a covariantly conserved stress-energy

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2a5a0933c22ac96916f556b1580105e7
http://arxiv.org/abs/2202.01371

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Analytic study of cosmological perturbations in a unified model of dark matter and dark energy with a sharp transition

Autor: Léo G. Medeiros, R. R. Cuzinatto, Eduardo M. de Morais, Robert H. Brandenberger

Publikováno v: Web of Science
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Repositório Institucional da UFRN
Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN

We study cosmological perturbations in a model of unified dark matter and dark energy with a sharp transition in the late-time universe. The dark sector is described by a dark fluid which evolves from an early stage at redshifts $z > z_C$ when it beh

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3a292546810a4930fe8951d55244aa83
https://doi.org/10.1016/j.astropartphys.2018.07.005

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Gravitational waves in higher-order $R^{2}$ gravity

Autor: L. G. Medeiros, R. R. Cuzinatto, S. G. Vilhena

We perform a comprehensive study of gravitational waves in the context of the higher-order quadratic scalar curvature gravity, which encompasses the ordinary Einstein-Hilbert term in the action plus an $R^{2}$ contribution and a term of the type $R\s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::28091411038d9e324f405abcdfb012c1

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Non-commutativity and non-inertial effects on the Dirac oscillator in a cosmic string space-time

Autor: P. J. Pompeia, R. R. Cuzinatto, M. de Montigny

We examine the non-inertial effects of a rotating frame on a Dirac oscillator in a cosmic string space-time with non-commutative geometry in phase space. We observe that the approximate bound-state solutions are related to the biconfluent Heun polyno

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::61c3c1ac9eb7de3fee29aeb55b08f698
http://arxiv.org/abs/1909.00904

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f(R,∇μ1R,…,∇μ1…∇μnR) theories of gravity in Einstein frame: A higher order modified Starobinsky inflation model in the Palatini approach

Autor: R. R. Cuzinatto, L. G. Medeiros, P. J. Pompeia, C. A. M. de Melo

Publikováno v: Physical Review D. 99

In Cuzinatto et al. [Phys. Rev. D 93, 124034 (2016)], it has been demonstrated that theories of gravity in which the Lagrangian includes terms depending on the scalar curvature $R$ and its derivatives up to order $n$, i.e., $f(R,{\ensuremath{\nabla}}

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::dee8ccd633df93f70e84a765784410d5
https://doi.org/10.1103/physrevd.99.084053

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Higher-order modified Starobinsky inflation

Autor: L. G. Medeiros, P. J. Pompeia, R. R. Cuzinatto

An extension of the Starobinsky model is proposed. Besides the usual Starobinsky Lagrangian, a term proportional to the derivative of the scalar curvature, $\nabla_{\mu}R\nabla^{\mu}R$, is considered. The analyzis is done in the Einstein frame with t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5ce23a41953ffff79e7176cb5625814d
http://arxiv.org/abs/1810.08911

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New Scalar Field Quartessence

Autor: Jürg Fröhlich, R. R. Cuzinatto, Robert Brandenberger, Ryo Namba

We propose a cosmological scenario involving a scalar field, $\varphi$, that is a source of Dark Matter as well as of Dark Energy. Besides $\varphi$, the Lagrangian of the field theory envisaged in our scenario contains a second field $\chi$, for sim

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::24aae86c3b2b544d39ed05e1f333886b
http://arxiv.org/abs/1809.07409

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