196 citations · 676 across the 25 of their papers we have counts for
25 papers
Momentum Distributions and Spatial Signatures of Proton Halos in the sd Shell
Taslima S. C. Diba, Carlos A. Bertulani, Ronaldo V. Lobato
We perform a theoretical study of intermediate-energy quasifree one-proton knockout reactions on proton targets. Single-particle wave functions constrained by the experimental prot…
Neutron stars in a conservative gravity
Ronaldo V. Lobato, Geanderson A. Carvalho, Carlos E. C. Montaña +1
We investigate a conservative formulation of gravity motivated by a key limitation of several existing approaches: the gravitational function is often reconstructed from a…
Double White Dwarf Mergers as Progenitors of Long-Period Transients
Manuel Malheiro, Sarah V. Borges, Jaziel G. Coelho +6
There is an ongoing discussion in the literature on the nature of long-period transients (LPTs), radio-emitting sources with periods ranging from hundreds to tens of thousands of s…
Cosmologies in theory with non-minimal coupling between geometry and matter
Sergio Bravo Medina, Marek Nowakowski, Ronaldo V. Lobato +1
Among the recent extensions to standard General Relativity, gravity has risen an interest given the possibility of coupling between geometry and matter. We exa…
In-Stabilities of massive white dwarfs in modified gravity
Ronaldo V. Lobato, Geanderson A. Carvalho, Neelima G. Kelkar +1
Super-Chandrasekhar white dwarfs are a timely topic in the last years in the scientific community due to its connection to supernovae type Ia (SN Ia). Some early studies tackled th…
Orbital decay of double white dwarfs: beyond gravitational wave radiation effects
G. A. Carvalho, R. C. dos Anjos, J. G. Coelho +6
The traditional description of the orbital evolution of compact-object binaries, like double white dwarfs (DWDs), assumes that the system is driven only by gravitational wave (GW)…
Massive white dwarfs in gravity
R. V. Lobato, G. A. Carvalho, N. G. Kelkar +1
In this work, we investigate the equilibrium configurations of massive white dwarfs (MWD) in the context of modified gravity, namely gravity, where stands for the Ri…
Bayesian Inference of Phenomenological EoS of Neutron Stars with Recent Observations
Emanuel V. Chimanski, Ronaldo V. Lobato, Andre R. Goncalves +1
The description of stellar interior remains as a big challenge for the nuclear astrophysics community. The consolidated knowledge is restricted to density regions around the satura…
Cluster Structures with Machine Learning Support in Neutron Star M-R relations
R. V. Lobato, E. V. Chimanski, C. A. Bertulani
Neutron stars (NS) are compact objects with strong gravitational fields, and a matter composition subject to extreme physical conditions. The properties of strongly interacting mat…
Unsupervised machine learning correlations in EoS of neutron stars
Ronaldo V. Lobato, Emanuel V. Chimanski, Carlos A. Bertulani
Neutron stars are compact objects of large interest in the nuclear astrophysics community. The extreme conditions present in such systems impose big challenges to our current micro…
Quark stars with 2.6 in a non-minimal geometry-matter coupling theory of gravity
G. A. Carvalho, R. Lobato, P. H. R. S. Moraes +2
This work analyses the hydrostatic equilibrium configurations of strange stars in a non-minimal geometry-matter coupling (GMC) theory of gravity. Those stars are made of strange qu…
Neutron diffusion in magnetars as a source of astrophysical bursts
C. A. Bertulani, R. V. Lobato
Neutron tunneling in neutron star crusts can release enormous amounts of energy on a short timescale. We have clarified aspects of this process occurring in the outer crust regions…
Neutron stars in gravity with realistic equations of state: joint-constrains with GW170817, massive pulsars, and the PSR J0030+0451 mass-radius from data
R. V. Lobato, G. A. Carvalho, C. A. Bertulani
In this work we investigate neutron stars (NS) in theory of gravity for the case , wher…
Neutron tunneling: A new mechanism to power explosive phenomena in neutron stars, magnetars, and neutron star mergers
Carlos A. Bertulani, Ronaldo V. Lobato
Neutron tunneling between neutron-rich nuclei in inhomogeneous dense matter encountered in neutron star crusts can release enormous energy on a short-timescale to power explosive p…
Final state interaction in the pn and nn decay channels of He
C. A. Bertulani, R. Lobato
We study the effects of final state interactions in the non-mesonic weak decay (n is a neutron and N is either a neutron or a proton) of the hypernucleus …
Neutron stars in gravity using realistic equations of state in the light of massive pulsars and GW170817
R. Lobato, O. Lourenço, P. H. R. S. Moraes +5
In this work we investigate neutron stars (NS) in gravity for the case , is the Ricci scalar and the trace of the en…
General approach to the Lagrangian ambiguity in gravity
G. A. Carvalho, F. Rocha, H. O. Oliveira +1
The gravity is a theory whose gravitational action depends arbitrarily on the Ricci scalar, , and the trace of the stress-energy tensor, ; its field equations also d…
Extra dimensions' influence on the equilibrium and radial stability of strange quark stars
José D. V. Arbañil, Geanderson A. Carvalho, Ronaldo V. Lobato +2
We analyze the influence of extra dimensions on the static equilibrium configurations and stability against radial perturbations. For this purpose, we solve stellar structure equat…
Compact Astrophysical Objects in gravity
P. H. R. S. Moraes, J. D. V. Arbañil, G. A. Carvalho +4
In this article we study the hydrostatic equilibrium configuration of neutron stars (NSs) and strange stars (SSs), whose fluid pressure is computed from the equations of state $p=ω…
Energy nonconservation as a link between gravity and noncommutative quantum theory
Ronaldo V. Lobato, G. A. Carvalho, A. G. Martins +1
gravity was proposed as an extension of the theories, containing not just geometrical correction terms to the General Relativity equations, but also material correc…
GRB 170817A-GW170817-AT 2017gfo and the observations of NS-NS, NS-WD and WD-WD mergers
J. A. Rueda, R. Ruffini, Y. Wang +8
The LIGO-Virgo Collaboration has announced the detection of GW170817 and has associated it with GRB 170817A. These signals have been followed after 11 hours by the optical and infr…
Stellar equilibrium configurations of white dwarfs in the gravity
G. A. Carvalho, R. V. Lobato, P. H. R. S. Moraes +4
In this work we investigate the equilibrium configurations of white dwarfs in a modified gravity theory, na\-mely, gravity, for which and stand for the Ricci scala…
Ultra-high energy cosmic rays from white dwarf pulsars and the Hillas criterion
Ronaldo V. Lobato, Jaziel G. Coelho, M. Malheiro
The sources of ultra-high-energy cosmic rays ( eV) is still an open question in astroparticle physics and in the last years some efforts were made to understand it…
Analytical general solutions for static wormholes in gravity
P. H. R. S. Moraes, R. A. C. Correa, R. V. Lobato
Originally proposed as a tool for teaching the general theory of relativity, wormholes are today approached in many different ways and are seeing as an efficient alternative for in…