401 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Pontificia Universidad Católica de ValparaísoCL25 papers
- Institute of Astrophysics and Space SciencesPT18 papers
- University of ChileCL18 papers
- University of LisbonPT17 papers
- University of TarapacáCL16 papers
- Universidad de Santiago de ChileCL15 papers
- Universidad Diego PortalesCL14 papers
- Universidade Federal do ParáBR8 papers
- University of Bío-BíoCL8 papers
- Universidad MayorCL7 papers
- University of ConcepciónCL7 papers
- University of La SerenaCL7 papers
72 papers · 1 filter
Evolution of matter perturbations in the context of cosmic slowing down
D. Koh Cuende, G. Panotopoulos
We investigate dynamical, time-evolving dark-energy models exhibiting phantom behaviour within Einstein gravity by analysing the evolution of matter perturbations. In particular, w…
On Modeling Anisotropic Quark Stars: The Role of Anisotropy in Radial Oscillation Spectra
G. Panotopoulos
We model the compact object Cen X-3, which is considered to be a good strange quark star candidate of known mass and radius, incorporating a negative anisotropic factor, and we com…
Slowly rotating condensate dark stars beyond the mean-field approximation
Grigoris Panotopoulos, Ángel Rincón, Ilidio Lopes
We investigate rotational properties and universal relations of slowly rotating Bose-Einstein condensate dark stars in the context of General Relativity, both at the mean-field lev…
Radial oscillations of quark stars in light of current astrophysical constraints: A comparative study
G. Panotopoulos, A. Rincon, I. Lopes
We investigate the structural and oscillatory properties of isotropic strange quark stars within General Relativity, focusing on three physically motivated equations of state: the…
Black hole physics within gravity: Quasi-normal spectra and greybody factors
Ángel Rincón, Grigoris Panotopoulos
We investigate several astrophysical motivated properties of a four-dimensional black hole solution in the framework of gravity. The model is characterized by a single addit…
Condensate Dark Stars beyond the Mean-Field Approximation: The Lee-Huang-Yang correction
Grigoris Panotopoulos
We study structural properties of self-gravitating fluid spheres made of a dilute, homogeneous and ultracold Bose gas assuming repulsive, short-range interactions. For the first ti…
Stellar modeling within regularized 4D Einstein-Gauss-Bonnet gravity in light of current astrophysical constraints
G. Panotopoulos, Á. Rincón, I. Lopes
In this study we obtain interior solutions and investigate structural properties of isotropic compact stars in the framework of four-dimensional regularized Einstein-Gauss-Bonnet (…
Cosmological implications of Bumblebee theory on an FLRW background
Manuel Gonzalez-Espinoza, Grigorios Panotopoulos, Francisco Tello-Ortiz
We investigate some cosmological implications at background level of the Bumblebee model. The phase-space, the critical points and their stability are analyzed in detail applying w…
First-order phase transitions and cosmic evolution: thermodynamic approach to generalized holographic dark energy
Miguel Cruz, Joaquin Housset, Samuel Lepe +2
Focusing on the description of cosmic evolution at late times, this study examines a generalized holographic dark energy (HDE) framework constructed via a polynomial expansion in t…
Compact Stars in Symmetric Teleparallel Scalar-Tensor Gravity
Grigorios Panotopoulos, Andrés Lueiza-Colipí, Nikolaos Dimakis +1
We investigate the existence of static, spherically symmetric compact objects within the framework of symmetric teleparallel scalar-tensor gravity. This theory extends the Brans-Di…
Localized five-dimensional rotating brane-world black hole Analytically Connected to an to an AdS boundary
Milko Estrada, Francisco Tello-Ortiz
We provide a method to describe the geometry of an analytic, exponentially localized rotating braneworld black hole, using the Janis Newman algorithm in Hopf coordinates.…
Radial Oscillations of the HESS J1731-347 Compact Object via the Karmarkar Condition in Gravity
Grigoris Panotopoulos
We model the light HESS J1731-347 compact object (of known stellar mass and radius) within Einstein's General Relativity imposing the Karmarkar condition in gravity for anisotropic…
-cosmological dynamics in the FLRW background
Nikolaos Dimakis, Alex Giacomini, Genly Leon +3
We examine the cosmological dynamics of Einstein-Gauss-Bonnet gravity models in a four-dimensional spatially flat FLRW metric. These models are described by $f\left( R,\mathcal{G}\…
Rotating Einstein-Maxwell-Dilaton Black Hole as a Particle Accelerator
Muhammad Ali Raza, Sehar, M. Azam +2
Similar to particle accelerators, black holes also have the ability to accelerate particles, generating significant amounts of energy through particle collisions. In this study, we…
Relativistic stars in -gravity: Exact analytic solution for the power-law case
Nikolaos Dimakis, Alex Giacomini, Andronikos Paliathanasis +1
We investigate static spherically symmetric spacetimes within the framework of symmetric teleparallel gravity in order to describe relativistic stars. We adopt a specific an…
On static and rotating decoupled black holes without inner horizons
Pablo Leon, B. Mishra, Y. Gomez-Leyton +1
Through gravitational decoupling using the extended minimal geometric deformation, a new family of static and rotating ``hairy'' black holes is provided. The background of these mo…
On new regular charged black hole solutions: Limiting Curvature Condition, Quasinormal modes and Shadows
Leonardo Balart, Grigoris Panotopoulos, Angel Rincon
We introduce two new static, spherically symmetric regular black hole solutions that can be obtained from non-linear electrodynamics models. For each solution, we investigate the d…
Some optical properties of rotating wormhole in Bopp-Podolsky electrodynamics
Muhammad Ali Raza, Francisco Tello-Ortiz, M. Zubair +1
In this work, we consider a static wormhole in Bopp-Podolsky electrodynamics and convert it into its rotating counterpart by reducing it into Morris-Thorne form. We further study t…
Tracing cosmic evolution through Weyl-Type f(Q,T) gravity model: theoretical analysis and observational validation
Rahul Bhagat, Francisco Tello-Ortiz, B. Mishra
We investigate the cosmic evolution of the Universe across different cosmological epochs in exponential Weyl-type gravity model. The theoretical analysis involves a detai…
Strange Quark Stars and Condensate Dark Stars in Bumblebee Gravity
Grigoris Panotopoulos, Ali Övgün
In this paper, we investigate the properties of relativistic stars made of isotropic matter within the framework of the minimal Standard Model Extension, where a Bumblebee field (B…
Stellar modeling via the Tolman IV solution: The cases of the massive pulsar J0740+6620 and the HESS J1731-347 compact object
Grigoris Panotopoulos
We model compact objects of known stellar mass and radius made of isotropic matter within Einstein's gravity. The interior solution describing hydrostatic equilibrium we are using…
On exotic objects made of dark energy and dark matter: Mass-to-radius profiles and tidal Love numbers
Camila Sepúlveda, Grigoris Panotopoulos
We investigate some properties of exotic spherical configurations made of dark matter and dark energy. For the former we adopt a polytropic equation-of-state, while for the latter…
Regular charged black holes, energy conditions and quasinormal modes
Leonardo Balart, Grigoris Panotopoulos, Ángel Rincón
We discuss energy conditions and quasinormal modes for scalar perturbations of regular charged black holes within the framework of General Relativity coupled to non-linear electrod…
Thermodynamics and the Joule-Thomson expansion of dilaton black holes in 2+1 dimensions
Leonardo Balart, Sharmanthie Fernando
In this paper, we study thermodynamics and its applications of a family of static charged dilaton black holes in 2+1 dimensions found by Chan and Mann \cite{Chan:1994qa} and Xu \ci…