3 papers
astro-ph.HE2026
Testing black hole space-times with the S2 star orbit: a Bayesian comparison
César Navarrete, Fernando Vázquez-Chávez, Alejandro Cruz-Osorio +1
We implement a Markov Chain Monte Carlo method to obtain posterior probability distributions for the parameters of the S2 star orbit around Sagittarius A*, for seven representative…
gr-qc2025
On the phase transition mechanism of spontaneous scalarization
João Vitor M. Muniz, Néstor Ortiz, Raissa F. P. Mendes
In certain modified gravity theories that include additional scalar degrees of freedom, compact objects such as black holes and neutron stars may undergo a process known as spontan…
gr-qc2024
Dynamical transition to spontaneous scalarization in neutron stars: The massive scalar field scenario
Juan Carlos Degollado, Néstor Ortiz, Marcelo Salgado
We analyze numerically the dynamical transition to spontaneous scalarization in neutron stars in the framework of a scalar-tensor theory of gravity where the scalar field is free b…