18 citations · 22 across the 3 of their papers we have counts for
6 papers · 1 filter
Neutron stars in gravity with conserved energy-momentum tensor: Hydrostatic equilibrium and asteroseismology
Juan M. Z. Pretel, Sergio E. Jorás, Ribamar R. R. Reis +1
We investigate the equilibrium and radial stability of spherically symmetric relativistic stars, considering a polytropic equation of state (EoS), within the framework of …
Strongest constraint in gravity: stellar stability
Juan M. Z. Pretel, Sergio E. Jorás, Ribamar R. R. Reis
In the metric approach of theories of gravity, the fourth-order field equations are often recast as effective Einstein equations in the presence of standard matter and a cur…
Massive scalar wave packet emission by a charged Black Hole and Cosmic Censorship Conjecture violation
Rodrigo L. Fernandez, Ribamar R. R. Reis, Sergio E. Jorás
We study the tunneling probability of a massive () uncharged scalar packet out from a near-extremal, static charged black hole (with mass and charge ). We sho…
Neutron star masses in -gravity
Fulvio Sbisà, Pedro O. Baqui, Tays Miranda +2
We address the issue of the existence of inequivalent definitions of gravitational mass in -gravity. We present several definitions of gravitational mass, and discuss the fo…
Pressure effects in the weak-field limit of f(R) = R + alpha R^2 gravity
Fulvio Sbisà, Oliver F. Piattella, Sergio E. Jorás
We investigate the linear regime of f(R) = R + alpha R^2 gravity for static, spherically symmetric and asymptotically flat configurations of matter. We show that, in vacuum and dee…
Chaos in a closed Friedmann-Robertson-Walker universe: An imaginary approach
S. E. Jorás, T. J. Stuchi
In this work we study the existence of mechanisms of transition to global chaos in a closed Friedmann-Robertson-Walker universe with a massive conformally coupled scalar field. We…