112 citations · 447 across the 10 of their papers we have counts for
10 papers
Gravitational quadrupole deformation and the tidal deformability for stellar systems: (The number of) Love for undergraduates
Andreas Zacchi
This article is intended for undergraduate students with the aim to provide a pedagogical introduction to the physics of stellar tidal deformations. The spherically symmetric shape…
Implications of the fermion vacuum term in the extended SU(3) Quark Meson model on compact stars properties
Andreas Zacchi, Juergen Schaffner-Bielich
We study the impact of the fermion vacuum term in the SU(3) quark meson model on the equation of state and determine the vacuum parameters for various sigma meson masses. We examin…
Signals in the tidal deformability for phase transitions in compact stars with constraints from GW170817
Jan-Erik Christian, Andreas Zacchi, Jürgen Schaffner-Bielich
We compute the tidal deformabilities for neutron star merger for equations of state with a strong first order phase transition producing a new separate branch in the mass-radius di…
Relativistic parameterizations of neutron matter and implications for neutron stars
Nadine Hornick, Laura Tolos, Andreas Zacchi +2
We construct parameter sets of the relativistic mean-field model fitted to the recent constraints on the asymmetry energy and the slope parameter for pure neutron matter. W…
The VO: A powerful tool for global astronomy
Christophe Arviset, Mark Allen, Alessandra Aloisi +14
Since its inception in the early 2000, the Virtual Observatory (VO), developed as a collaboration of many national and international projects, has become a major factor in the disc…
Effects of Renormalizing the chiral SU(2) Quark-Meson-Model
Andreas Zacchi, Jürgen Schaffner-Bielich
We investigate the restoration of chiral symmetry at finite temperature in the SU(2) quark meson model where the mean field approximation is compared to the renormalized version fo…
Classifications of Twin Star Solutions for a Constant Speed of Sound Parameterized Equation of State
Jan-Erik Christian, Andreas Zacchi, Jürgen Schaffner-Bielich
We explore the possible mass radius relation of compact stars for the equation of states with a first order phase transition. The low density matter is described by a nuclear matte…
Twin Stars within the SU(3) Chiral Quark-Meson Model
Andreas Zacchi, Laura Tolos, Jürgen Schaffner-Bielich
We present new stable solutions of the Tolman Oppenheimer Volkoff equations for quark stars using a quark matter equation of state based on the SU(3) Quark-Meson model that exhibit…
Stable hybrid stars within a SU(3) Quark-Meson-Model
Andreas Zacchi, Matthias Hanauske, Jürgen Schaffner-Bielich
The inner regions of the most massive compact stellar objects might be occupied by a phase of quarks. Since the observations of the massive pulsars PSR J1614-2230 and of PSR J0348+…
Compact stars in a SU(3) Quark-Meson Model
Andreas Zacchi, Rainer Stiele, Juergen Schaffner-Bielich
The recent observations of the massive pulsars PSR J1614-2230 and of PSR J0348+0432 with about two solar masses implies strong constraints on the properties of dense matter in the…