A5072468351- Pulsars and Gravitational Waves Research
- Cosmology and Gravitation Theories
- Cold Atom Physics and Bose-Einstein Condensates
- High-Energy Particle Collisions Research
- High-pressure geophysics and materials
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Quantum Chromodynamics and Particle Interactions
- Geophysics and Sensor Technology
- Geophysics and Gravity Measurements
- Black Holes and Theoretical Physics
- Astro and Planetary Science
- Particle physics theoretical and experimental studies
- Scientific Computing and Data Management
- Nuclear physics research studies
- Quantum, superfluid, helium dynamics
- Machine Learning in Materials Science
- Innovative Microfluidic and Catalytic Techniques Innovation
Lawrence Livermore National Laboratory
2025
Brazilian Center for Research in Energy and Materials
2024
Centro Brasileiro de Pesquisas Físicas
2024
Universidad Tecnológica del Perú
2024
Universidade de São Paulo
2021-2023
Instituto Butantan
2022
Universidade Federal do Rio de Janeiro
2018-2020
We investigated compact stars consisting of cold quark matter and fermionic dark treated as two admixed fluids. computed the stellar structures fundamental radial oscillation frequencies for different masses fermion in cases weak strong self-interacting matter. found that frequency can be dramatically modified and, some cases, stable strange planets strangelets with very low radii formed.
We investigate the behavior of dense and cold (normalized) quantum chromodynamics (QCD) trace anomaly, <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi mathvariant="normal">Δ</a:mi></a:math>, in interior twin neutron stars (obtained from several sets equations state agreement with modern compact-star multimessenger data) satisfying static dynamic stability conditions. scan formed twin-star parameter space order to look for effects caused by presence a strong...
The nuclear equation of state (EOS) is at the center numerous theoretical and experimental efforts in physics. With advances microscopic theories for interactions, availability experiments probing matter under conditions not reached before, endeavors to develop sophisticated reliable transport simulations interpret these experiments, advent multi-messenger astronomy, next decade will bring new opportunities determining EOS, elucidating its dependence on density, temperature, isospin...
We perform the general relativistic stability analysis against adiabatic radial oscillations of unpaired quark stars obtained using equation state for cold matter from perturbative QCD, only free parameter being renormalization scale. This approach consistently incorporates effects interactions and includes a built-in estimate inherent systematic uncertainties in evaluation state. also take into account constraints imposed by recent gravitational wave event GW170817 to compact star masses...
We investigate the structure of quark stars in framework $f(R)= R+ \alpha R^2$ gravity using an equation state for cold matter obtained from perturbative QCD, parametrized only by renormalization scale. show that a considerably large range free parameter $\alpha$, within and even beyond constraints previously reported literature, yield non-negligible modifications mass radius with central densities. Besides, their stability against baryon evaporation is analyzed through behavior associated...
We study the stability against infinitesimal radial oscillations of neutron stars generated by a set equations state obtained from first-principle calculations in cold and dense QCD constrained observational data. consider mild large violations conformal bound, ${c}_{s}=1/\sqrt{3}$, that can possibly contain quark matter core. Some star families mass-radius diagram become dynamically unstable due to oscillation amplitudes near
We study the effects of heavy quarks on equation state for cold and dense quark matter obtained from perturbative QCD, yielding observables parametrized only by renormalization scale. investigate thermodynamics charm under constraints $\beta$ equilibrium electric charge neutrality in a region densities where QCD is, principle, much more reliable. also analyze stability stars, which might be realized as new branch ultradense hybrid compact find that such stars are unstable radial oscillations.
Abstract By assuming that ultra dense hybrid neutron stars are endowed with a distribution of electric charge, we study the corresponding twin star solutions and their properties resulting from sharp first order transition confined hadronic to deconfined quark phase. Two distinct matter equations state increasing stiffness considered values for maximum gravitational masses configurations obtained different total charge. Interestingly, our calculations indicate transitions make charged more...
We investigate protoneutron star matter using the state-of-the-art perturbative equation of state for cold and dense QCD in presence a fixed lepton fraction which both electrons neutrinos are included. Besides computing modifications due to trapped neutrinos, we show that stable strange quark has more restricted parameter space. also study possibility nucleation unpaired core stars by matching lepton-rich pressure onto hadronic state, namely TM1 with neutrinos. Using inherent dependence on...
We investigated the radial and non-radial fundamental ($f$) mode oscillations of self-bound (quark) stars obtained after employing Vector MIT (vMIT) bag model. Within this model, we computed equation state for strange quark matter satisfying thermodynamic consistency. This allowed us to obtain corresponding behavior speed sound, mass-radius relation, gravitational redshift. In particular, our choice $G_V$ = 0.30 fm$^2$ produces masses radii in agreement with recent astronomical data (e.g....
We investigate the behavior of dense and cold (normalized) QCD trace anomaly, $\Delta$, in interior twin neutron stars (obtained from several sets equations state agreement with modern compact-star multimessenger data) satisfying static dynamic stability conditions. scan this parameter space order to look for effects caused by presence a strong first-order phase transition connecting hadron quark phases means Maxwell construction. found robustly that $\Delta$ suffers an abrupt decrease...
We investigate the effects of rapid and slow conversions on fundamental-mode eigenfrequencies hybrid neutron stars having highly discontinuous transitions between hadronic quark matter, so-called twin stars. analyze some characteristic cases in available parameter space equations state for phases. Furthermore, we also consider possibility that these stellar configurations are electrically charged. Our results indicate neutral under stability window coincides with usual criterion, i.e....
The dynamical stability of strange-dwarf hybrid stars and strange planets, constituted by strange-quark-matter cores dilute-nuclear-matter crusts, is revisited analyzing the fundamental mode eigenfrequencies radial oscillation equations with boundary conditions for slow (rapid) conversions originating at density-discontinuous interface characterizing extremely large (small) microscopic timescales compared to periods. For hadronic crust we used an analytic fit BPS results matched massless MIT...
We explore protoneutron star matter in the framework of cold and dense QCD using state-of-the-art perturbative equation state including neutrinos fixed by a lepton fraction that is appropriate for this environment. Furthermore, we calculate modifications lepton-rich showing stable strange quark has more restricted parameter space.
The heavy-quark effects on the equation of state for cold and dense quark matter are obtained from perturbative QCD, yielding observables parametrized only by renormalization scale. In particular, we investigate thermodynamics charm under constraints β equilibrium electric charge neutrality in a region densities where QCD is, principle, much more reliable. Finally, analyze stability stars, which might be realized as new branch ultradense hybrid compact find that such self-bound stars...
We investigate the effects of rapid and slow conversions on fundamental-mode eigenfrequencies hybrid neutron stars having highly discontinuous transitions between hadronic quark matter, so-called twin stars. analyze some characteristic cases in available parameter space equations state for phases. Furthermore, we also consider possibility that these stellar configurations are electrically charged. Our results indicate neutral under stability window coincides with usual criterion, i.e....
Abstract We explore the structural stability of neutron stars against radial pulsations obtained by a set equations state calculated from successive interpolations between perturbative QCD at high densities and chiral effective field theory low being constrained also observational data intermediate densities. In order to do this, we solve pair first-order coupled differential equivalent original Sturm-Liouville problem obtain zero-mode frequencies characterizing stable stars. Besides, study...
In this work, we study the effects that interacting quark matter has on stellar structure of strange and charm stars. Additionally, their stability against radial pulsations is analyzed using a first-order formalism for adiabatic general relativistic oscillations. Besides, early stage evolution neutron stars after supernovae explosion, i.e. protoneutron stars, investigated by considering possibility phase transition to rich in leptons, where dynamics conversion between phases studied within...