48 citations · 450 across the 33 of their papers we have counts for
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Gravitational Waves Emission in Quadratic Gravity: longitudinal modes, angular momentum emission, and positivity of the radiated power
Matheus F. S. Alves, R. R. Cuzinatto, C. A. M. de Melo +2
In this paper, the emission of gravitational waves in quadratic gravity theory is examined. The wave equations for massless and massive perturbations are derived, followed by the c…
Inflationary dynamics in modified gravity models
R. R. Cuzinatto, L. G. Medeiros
Higher-order theories of gravity are a branch of modified gravity wherein the geometrodynamics of the four-dimensional Riemannian manifold is determined by field equations involvin…
Viable wormhole solution in Bopp-Podolsky electrodynamics
D. A. Frizo, C. A. M. de Melo, L. G. Medeiros +1
Following a recent approach in which the gravitational field equations in curved spacetimes were presented in the Bopp--Podolsky electrodynamics, we obtained an approximate and sph…
Gravitational waves from inspiraling black holes in quadratic gravity
Matheus F. S. Alves, Luís F. M. A. M. Reis, L. G. Medeiros
We peform a study of gravitational waves emitted by inspiraling black holes in the context of quadratic gravity. By linearizing the field equations around a flat background, we dem…
Modified Starobinsky inflation by the term
J. Bezerra-Sobrinho, L. G. Medeiros
In the context of effective theories of gravity, a minimalist bottom-up approach which takes into account -loop quantum corrections leads to modifications in the Einstein-Hilber…
Gravitational waves in higher-order gravity
S. G. Vilhena, L. G. Medeiros, R. R. Cuzinatto
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…
Spherically Symmetric Solutions in Higher-Derivative Theories of Gravity
G. Rodrigues-da-Silva, L. G. Medeiros
Higher-order theories of gravity have received much attention from several areas including quantum gravity, string theory and cosmology. This paper proposes a higher-order gravity…
Higher-order modified Starobinsky inflation
R. R. Cuzinatto, L. G. Medeiros, P. J. Pompeia
An extension of the Starobinsky model is proposed. Besides the usual Starobinsky Lagrangian, a term proportional to the derivative of the scalar curvature, , is…
theories of gravity in Einstein frame: A higher order modified Starobinsky inflation model in the Palatini approach
R. R. Cuzinatto, C. A. M. de Melo, L. G. Medeiros +1
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 …
Bopp-Podolsky black holes and the no-hair theorem
R. R. Cuzinatto, C. A. M. de Melo, L. G. Medeiros +2
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…
Scalar-multi-tensorial equivalence for higher order theories of gravity
R. R. Cuzinatto, C. A. M. de Melo, L. G. Medeiros +1
The equivalence between theories depending on the derivatives of , i.e. , and scalar-multi-tensorial theories is verified. The analys…
Non-linear effects on radiation propagation around a charged compact object
R. R. Cuzinatto, C. A. M. de Melo, K. C. de Vasconcelos +2
The propagation of non-linear electromagnetic waves is carefully analyzed on a curved spacetime created by static spherically symmetric mass and charge distribution. We compute how…
Observational constraints to a phenomenological -model
R. R. Cuzinatto, C. A. M. de Melo, L. G. Medeiros +1
This paper analyses the cosmological consequences of a modified theory of gravity whose action integral is built from a linear combination of the Ricci scalar and a quadratic t…
Cosmological analytic solutions with reduced relativistic gas
L. G. Medeiros
In this paper one examine analytical solutions for flat and non-flat universes composed by four components namely hot matter (ultra-relativistic), warm matter (relativistic), cold…
Cosmic acceleration from second order gauge gravity
R. R. Cuzinatto, C. A. M. de Melo, L. G. Medeiros +1
We construct a phenomenological theory of gravitation based on a second order gauge formulation for the Lorentz group. The model presents a long-range modification for the gravitat…
Interacting Constituents in Cosmology
R. Aldrovandi, R. R. Cuzinatto, L. G. Medeiros
Universe evolution, as described by Friedmann's equations, is determined by source terms fixed by the choice of pressure energy-density equations of state . The usua…
Gauge Formulation for Higher Order Gravity
R. R. Cuzinatto, C. A. M. de Melo, L. G. Medeiros +1
This work is an application of the second order gauge theory for the Lorentz group, where a description of the gravitational interaction is obtained which includes derivatives of t…
Cosmic Acceleration from Elementary Interactions
R. Aldrovandi, R. R. Cuzinatto, L. G. Medeiros
It is possible to generate an accelerated period of expansion from reasonable potentials acting between the universe particle constituents. The pressure of primordial nucleons inte…
Primeval symmetries
R. Aldrovandi, R. R. Cuzinatto, L. G. Medeiros
A detailed examination of the Killing equations in Robertson-Walker coordinates shows how the addition of matter and/or radiation to a de Sitter Universe breaks the symmetry genera…
Analytic solutions for the -FRW Model
R. Aldrovandi, R. R. Cuzinatto, L. G. Medeiros
The high precision attained by cosmological data in the last few years has increased the interest in exact solutions. Analytic expressions for solutions in the Standard Model are p…