234 citations · 655 across the 18 of their papers we have counts for
22 papers
Temperature definitions and phase transitions within non-minimal large and small inflationary potentials
Jesus Anaya-Galeana, Orlando Luongo, Hernando Quevedo
We explore and compare two distinct temperature definitions for scalar field inflation in the context of small- and large-field potentials. The first is based on a real gas, fluid-…
A thermodynamic model of inflation without inflaton field
Jesus Anaya-Galeana, Orlando Luongo, Hernando Quevedo
In the framework of geometrothermodynamics, we explore how to construct an inflationary cosmic fluid without requiring inflaton fields. To do so, we employ standard radiation and m…
Anisotropic Generalized Polytropic Spheres: Regular 3D Black Holes
Seyed Naseh Sajadi, Mohsen Khodadi, Orlando Luongo +1
We model gravitating relativistic 3D spheres composed of an anisotropic fluid in which the radial and transverse components of the pressure correspond to the vacuum energy and a ge…
Gravitational repulsive effects in 3D regular black holes
Orlando Luongo, Hernando Quevedo, S. N. Sajadi
In this work, we consider the effects of repulsive gravity in an invariant way for four static 3D regular black holes, using the eigenvalues of the Riemann curvature tensor, the Ri…
Geometrothermodynamic cosmology
Orlando Luongo, Hernando Quevedo
We review the main aspects of geometrothermodynamics, a formalism that uses contact geometry and Riemannian geometry to describe the properties of thermodynamic systems. We show ho…
Repulsive regions in Lemaître-Tolman-Bondi gravitational collapse
Roberto Giambò, Orlando Luongo, Hernando Quevedo
We show that in the inhomogeneous Lema{î}tre-Tolman-Bondi space-time there are specific regions in which repulsive gravity exists. To find these regions, we use an invariant defini…