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Abstract：
We examine the principal core g-mode oscillation in hybrid stars containing quark matter, implementing both a first-order phase change (via a Gibbs construction) as well as a crossover (using a recent model inspired by lattice QCD) for the emergence of quarks. We compute the properties of the composition-dependent g-mode, employing the Cowling approximation and also linearized perturbative equations of general relativity. We find that stars with a Gibbs mixed phase yield g-mode amplitudes and the associated gravitational energy radiated that dominate over those of crossover stars owing to the distinct behaviors of the equilibrium and adiabatic sound speeds in the two frameworks. Moreover, the Cowling approximation underestimates the g-mode frequency by up to 10% for higher mass stars, depending on the parameters of the nuclear equation of state and how the mixed phase is constructed. We also find that the g-mode frequencies are well described by a linear scaling with the combined lepton and quark fraction in the center of stars. We conclude that should the principal g-mode be excited to sufficient amplitude for detection in a binary merger, its frequency would be a possible indication for the existence of nonnucleonic matter in neutron stars.
Biography:
EDUCATION:
BSc, Stony Brook University (SBU), NY, USA, 2003
MA, SBU, 2007
PhD, SBU, 2013
APPOINTMENTS:
2014 - 2017, Postdoc, Institut für Kernphysik, Forschungszentrum Jülich, Germany
2017 - 2018, Visiting Scientist, Ohio University, OH, USA
2018 - 2019, Postdoc, Kent State University, OH, USA
2019 - 2020, ECT*/TIFPA Postdoc, Trento, Italy
2020 - Present, FELLINI Fellow, INFN, Italy
RESEARCH INTERESTS:
Nuclear Astrophysics. In particular,
- Hadronic and quark matter in core-collapse supernovae, neutron stars, and their mergers
- Composition, structure, and thermal evolution of neutron stars
Online meeting room：
https://cern.zoom.us/j/67743535848?pwd=eTBXcStCc2tkSW9XaGE0Y2ovSGY5QT09 (ID: 677 4353 5848 Passcode: 537202)