Effective Potential for Quintessential Inflation Driven by Extrinsic Gravity

AJS Capistrano, LA Cabral - Universe, 2023 - mdpi.com
We numerically study the evolution of the extrinsic energy density in the context of an
inflationary regime at the background level in a five-dimensional model using a Bayesian …

Probing extra dimensions through cosmological observations of dark energy

R Jalalzadeh, S Jalalzadeh, B Malekolkalami - Physics of the Dark …, 2023 - Elsevier
We investigate the isometrically embedded Bianchi type-V cosmology braneworld model in
a D-dimensional bulk space. The model provides a fluid of geometric dark energy (GDE) …

Lower tensor-to-scalar ratio as possible signature of modified gravity

AJS Capistrano, RC Nunes, LA Cabral - Physical Review D, 2024 - APS
This paper simplifies the induced four-dimensional gravitational equations originating from a
five-dimensional bulk within the framework of Nash's embeddings, incorporating them into a …

Constraints on cosmokinetics of smooth deformations

AJS Capistrano - Monthly Notices of the Royal Astronomical …, 2015 - academic.oup.com
We study the possibility that Universe is subjected to a deformation, besides its expansion
described by Friedmann's equations. The concept of smooth deformation of a riemannian …

Lukewarm black holes in the Nash-Greene framework

AJS Capistrano - Physical Review D, 2019 - APS
In this work, we investigate the embedding of a four-dimensional spherically symmetric
metric in a six-dimensional bulk. By using the Nash-Greene embedding theorem, the …

Evolution of Density Parameters on a Smooth Embedded Universe

AJS Capistrano - Annalen der Physik, 2018 - Wiley Online Library
In this paper we examine the evolution of cosmic density parameters in a four‐dimensional
space‐time embedded in a five‐dimensional bulk space. We show that the extrinsic …

Geometrical aspects on the dark matter problem

AJS Capistrano, LA Cabral - Annals of Physics, 2014 - Elsevier
In the present paper we apply Nash's theory of perturbative geometry to the study of dark
matter gravity in a higher-dimensional space–time. It is shown that the dark matter …

Implications on the cosmic coincidence by a dynamical extrinsic curvature

AJS Capistrano, LA Cabral - Classical and Quantum Gravity, 2016 - iopscience.iop.org
In this work, we apply the smooth deformation concept in order to obtain a modification of
Friedmann's equations. It is shown that the cosmic coincidence can be at least alleviated …

Subhorizon linear Nash–Greene perturbations with constraints on H (z) and the deceleration parameter q (z)

AJS Capistrano, PTZ Seidel, HR Duarte - Physics of the Dark Universe, 2021 - Elsevier
The Hubble parameter H (z), as a function of redshift, is modified by the presence of a new
term originated from the extrinsic curvature in a four embedded space–time. Assuming an …

On classical thermal stability of black holes with a dynamical extrinsic curvature

AJS Capistrano, AC Gutiérrez-Piñeres, SC Ulhoa… - Annals of Physics, 2017 - Elsevier
We study the deformation caused by the influence of the extrinsic curvature on a vacuum
spherically symmetric metric embedded in a five-dimensional bulk. We investigate the …