21 papers
Quasinormal modes and shadow of Schwarzschild-Tangherlini black hole with GUP
J. A. V. Campos, M. A. Anacleto, F. A. Brito +2
In this work, we investigate quasinormal modes and the shadow of a Schwarzschild-Tangherlini black hole in dimensions, incorporating corrections arising from the Generalize…
Hardware-aware quantum attention for fast radio burst identification
Li He, Xuan Yang, Feng Xiong +10
Fast radio bursts (FRBs) are millisecond-duration extragalactic pulses whose discovery requires searches over large signal-parameter spaces and the rejection of candidate sets domi…
Saha's ionization in the Schwarzschild spacetime
Lázaro L. Sales, Jonatas A. Silva, Amilcar R. Queiroz
We investigate the Saha ionization equilibrium in the exterior Schwarzschild spacetime. Starting from the mass-shell condition for a massive particle, we derive the conserved energ…
Testing Statistical Isotropy in the FRB Sky Distribution: A Selection-Function-Aware Framework
Bruno W. N. Ribeiro, Thais Lemos, Carlos A. P. Bengaly +5
We perform a test of statistical isotropy in the Universe using the sky distribution of fast radio bursts (FRBs), based on a compilation of events detected by multiple surve…
Generalist Vision-Language Models for Fast Radio Burst detection: a zero-shot benchmark against a specialized detector
Raiff H. Santos, Amilcar R. Queiroz, Tharcisyo S. S. Duarte +2
Fast Radio Burst (FRB) detection increasingly relies on specialized deep learning models that require large task-specific training sets and cannot be redefined without retraining.…
A rotating black hole in a Hernquist dark matter halo: horizon geometry, thermodynamics, and quantum emission
A. A. Araújo Filho, Arun Kumar, N. Heidari +3
We investigate the geometrical, thermodynamic, and quantum emission properties of a rotating black hole immersed in a Hernquist dark matter halo. Starting from a static black hole…
Shadows and lensing signatures of a rotating black hole in a Hernquist dark matter halo
A. A. Araújo Filho, Arun Kumar, N. Heidari +3
We investigate the optical properties of a rotating black hole immersed in a Hernquist dark matter halo. The spacetime is generated from a static Hernquist black hole through the n…
Constraints on Dark Energy and Modified Gravity Models from Fast Radio Bursts and Late-Time Geometric Probes
Bruno W. N. Ribeiro, Lázaro L. Sales, Klécio. E. L. de Farias +3
We investigate the impact of 104 localized FRBs on cosmological parameter estimation when combined with three established late-time probes: Cosmic Chronometers (CC), Type Ia Supern…
From 2D Yang-Mills to Calogero-Sutherland via a colored particle
Marcia Tenser, Amilcar R. Queiroz
We study Yang-Mills theory coupled to a particle on a cylinder, where gauge invariance and compactness reduce the dynamics to a finite dimensional quantum system. In the Abelian ca…
Constraints on the baryon density from fast radio bursts using a non-parametric reconstruction of the Hubble parameter
Lázaro L. Sales, Klecio E. L. de Farias, Amilcar R. Queiroz +3
In this study, we use a sample of 130 well-localized fast radio bursts (FRBs) to constrain the physical baryon density , and the astrophysical contribution from host…
Probing Primordial Black Holes with upcoming Radio Telescopes: a case study for LOFAR2.0, FAST Core Array and BINGO
Joao R. L. Santos, Guillem Domènech, Amilcar R. Queiroz
Fast Radio Bursts (FRBs) are among the most intriguing phenomena observed in radio astronomy. So far, about 130 FRB signals have been confirmed and characterized by different surve…
Absorption and quasinormal modes by rotating acoustic black holes in Lorentz-violating background
J. A. V. Campos, M. A. Anacleto, F. A. Brito +2
In this work, we investigate the effects of Lorentz symmetry violation on the absorption cross section and quasinormal modes of a rotating acoustic black hole in (2+1) dimensions,…
Casimir Effect for a Massive Scalar Field in Lorentz-Violating Aether Compactification
K. E. L. de Farias, M. A. Anacleto, A. A. Araújo Filho +4
This work investigates the influence of Lorentz symmetry breaking, introduced by an aether-like field , on the Casimir effect within a five-dimensional flat spacetime. By cons…
Rotating black hole shadows in metric-affine bumblebee gravity
Jose R. Nascimento, Ana R. M. Oliveira, Albert Yu. Petrov +2
In this work, we investigate the structure of black hole shadows in the bumblebee gravity model formulated within the metric-affine framework, which incorporates spontaneous Lorent…
Quantum features of a non-commutative Schwarzschild black hole
A. A. Araújo Filho, I. P. Lobo, P. H. M. Barros +1
This work aims to present the quantum aspects of a non-commutative gauge gravity formulation of a Schwarzschild-like black hole constructed via the Moyal twist $\partial_t \wedge \…
Lorentz-violating modifications to particle dynamics, thermodynamics and vacuum energy in bumblebee gravity
A. A. Araújo Filho, K. E. L. de Farias, E. Passos +5
We investigate how spontaneous Lorentz symmetry breaking in bumblebee gravity modifies particle dynamics, thermodynamics, and vacuum energy around a static black hole background. S…
Stefan-Boltzmann Law and Thermal Casimir Effect in Neutron Star Spacetime via Thermo Field Dynamics
K. E. L. de Farias, M. A. Anacleto, Rafael A. Batista +5
We investigate the thermal Casimir effect for a massless scalar field in the curved spacetime of a neutron star within the Thermo Field Dynamics (TFD) formalism. Starting from the…
Neutrino oscillations in a Kalb-Ramond black hole background
Yuxuan Shi, A. A. Araújo Filho, K. E. L. de Farias +2
The analysis examines how neutrinos behave when their trajectories unfold around a black hole sourced by a Kalb-Ramond field, where spontaneous Lorentz symmetry breaking reshapes t…
Shadow structure of generalized black-bounce metrics
Jose R. Nascimento, Ana R. M. Oliveira, Albert Yu. Petrov +2
The existence of black hole shadows is one of the most interesting effects of the strong field regime of general relativity (GR). Recent observations by the Event Horizon Telescope…
Cosmographic constraints from late-time probes including fast radio bursts
Lázaro L. Sales, Klecio E. L. de Farias, Amilcar R. Queiroz +7
In this study, we use late-time probes, such as well-localized fast radio bursts (FRBs), baryon acoustic oscillations (BAO), supernovae (SNe), and cosmic chronometers (CC) to const…
The 2D Lorentz-violating fermionic Casimir effect under thermal conditions
K. E. L. de Farias, M. A. Anacleto, Iver Brevik +4
In the present work, we study a fermionic Lorentz invariance violation (LIV) theory with a CPT-even extension and analyze its impact on the Casimir effect under the MIT bag boundar…