112 citations · 501 across the 12 of their papers we have counts for
13 papers
Twins in the Shadow: Phase Transitions in Proto-Neutron Stars
Jannik Milthaler, Jan-Erik Christian, Pia Jakobus +1
We study the impact of a first-order phase transition from hadronic to deconfined quark matter on the evolution of proto-neutron stars. To maximize the applicability of our results…
Robustness of Magnetic Field Amplification in Neutron Star Mergers
Ricard Aguilera-Miret, Jan-Erik Christian, Stephan Rosswog +1
The dynamics of a binary neutron stars merger is governed by physics under the most extreme conditions, including strong spacetime curvature, ultra-high matter densities, luminous…
Comprehensive Analysis of Constructing Hybrid Stars with an RG-consistent NJL Model
Jan-Erik Christian, Ishfaq Ahmad Rather, Hosein Gholami +1
In this work, we investigate the properties of hadronic and quark matter that would allow for a first order phase transition between them within neutron stars. To this end, we use…
Constraining twin stars with cold neutron star cooling data
Melissa Mendes, Jan-Erik Christian, Farrukh J. Fattoyev +1
We investigate the influence of a phase transition from hadronic matter to a deconfined quark phase inside a neutron star on its cooling behaviour including the appearance of twin…
Which first order phase transitions to quark matter are possible in neutron stars?
Jan-Erik Christian, Jürgen Schaffner-Bielich, Stephan Rosswog
We examine which first order phase transitions are consistent with today's astrophysical constraints. In particular, we explore how a well-constrained mass-radius data point would…
Tidal Deformability of Fermion-Boson Stars: Neutron Stars Admixed with Ultra-Light Dark Matter
Robin Fynn Diedrichs, Niklas Becker, Cédric Jockel +3
In this work we investigate the tidal deformability of a neutron star admixed with dark matter, modeled as a massive, self-interacting, complex scalar field. We derive the equation…
Constraining exotic compact stars composed of bosonic and fermionic dark matter with gravitational wave events
Stephan Wystub, Yannick Dengler, Jan-Erik Christian +1
We investigate neutron star-black hole (NS-BH) merger candidates as a test for compact exotic objects. Using the events GW190814, GW200105 and GW200115 measured by the LIGO-Virgo c…
Confirming the existence of twin stars in a NICER way
Jan-Erik Christian, Jürgen Schaffner-Bielich
We demonstrate that future radius measurement of the NICER mission have the potential to reveal the existence of a strong phase transition in dense neutron star matter by confirmin…
Supermassive Neutron Stars Rule Out Twin Stars
Jan-Erik Christian, Jürgen Schaffner-Bielich
We investigate the implications of a hypothetical neutron star in regard to the possibility of a strong phase transition to quark matter. We use equations o…
Twin stars and the stiffness of the nuclear equation of state: ruling out strong phase transitions below with the new NICER radius measurements
Jan-Erik Christian, Jürgen Schaffner-Bielich
We explore the connection between the stiffness of an hadronic equation of state (EoS) with a sharp phase transition to quark matter to its tidal deformability. For this we employ…
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…
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…