6 papers
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…
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…
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…
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…
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…