113 citations · 571 across the 33 of their papers we have counts for
15 papers · 1 filter
Hybrid neutron stars among mass gap objects are excluded by twin stars at
Alexander Ayriyan, David Blaschke, Marcin Dubaj +2
We investigate the question whether compact objects in the so-called mass gap () can be neutron stars or hybrid stars. Using a generic hybrid star equation o…
Bayesian analysis of multimessenger M-R data with interpolated hybrid EoS
A. Ayriyan, D. Blaschke, A. G. Grunfeld +3
We introduce a family of equations of state (EoS) for hybrid neutron star (NS) matter that is obtained by a two-zone parabolic interpolation between a soft hadronic EoS at low dens…
Was GW170817 a canonical neutron star merger? Bayesian analysis with a third family of compact stars
David Blaschke, Alexander Ayriyan, David Alvarez-Castillo +1
We investigate the possibility that GW170817 has not been the merger of two conventional neutron stars (NS) but involved at least one if not two hybrid stars with a quark matter co…
Studying the parameters of the extended - model for neutron star matter
David Alvarez-Castillo, Alexander Ayriyan, Gergely Gábor Barnaföldi +2
In this work we study the parameters of the extended - model for neutron star matter by a Bayesian analysis on state-of-the-art multi-messenger astronomy observations, namely…
Studying the Landau mass parameter of the extended - model for neutron star matter
David E. Alvarez-Castillo, Alexander Ayriyan, Gergely Gábor Barnaföldi +1
We present a Bayesian analysis of the Landau mass within the extended - model for neutron star matter. To this purpose, we consider the mass measurement of the object PSR 074…
Accretion-induced collapse to third family compact stars as trigger for eccentric orbits of millisecond pulsars in binaries
David Edwin Alvarez-Castillo, John Antoniadis, Alexander Ayriyan +5
A numerical rotating neutron star solver is used to study the temporal evolution of accreting neutron stars using a multi-polytrope model for the nuclear equation of state named AC…
Astrophysical aspects of general relativistic mass twin stars
David Blaschke, David Edwin Alvarez-Castillo, Alexander Ayriyan +3
In this chapter we will introduce an effective equation of state (EoS) model based on polytropes that serves to study the so called "mass twins" scenario, where two compact stars h…
Bayesian Analysis for Extracting Properties of the Nuclear Equation of State from Observational Data including Tidal Deformability from GW170817
A. Ayriyan, D. Alvarez-Castillo, D. Blaschke +1
We develop a Bayesian analysis method for selecting the most probable equation of state under a set of constraints from compact star physics, which now include the tidal deformabil…
Two novel approaches to the hadron-quark mixed phase in compact stars
Vahagn Abgaryan, David Alvarez-Castillo, Alexander Ayriyan +2
First-order phase transitions, like the liquid-gas transition, proceed via formation of structures such as bubbles and droplets. In strongly interacting compact star matter, at the…
Model of the Phase Transition Mimicking the Pasta Phase in Cold and Dense Quark-Hadron Matter
Alexander Ayriyan, Hovik Grigorian
A simple mixed phase model mimicking so-called "pasta" phases in the quark-hadron phase transition is developed and applied to static neutron stars for the case of DD2 type hadonic…
Bayesian analysis for a new class of hybrid EoS models using mass and radius data of compact stars
A. Ayriyan, D. E. Alvarez-Castillo, S. Benic +3
We present a Bayesian analysis for a new class of realistic models of two-phase equations of state (EoS) for hybrid stars and demonstrate that the observation of a pair of high-mas…
Bayesian analysis for two-parameter hybrid EoS with high-mass compact star twins
David E. Alvarez-Castillo, Alexander Ayriyan, David Blaschke +1
We perform a Bayesian analysis in the basis of a recently developed two-parameter class of hybrid equations of state that allow for high-mass compact star twins. While recently a w…
New Bayesian analysis of hybrid EoS constraints with mass-radius data for compact stars
A. Ayriyan, D. E. Alvarez-Castillo, D. Blaschke +2
We suggest a new Bayesian analysis using disjunct mass and radius constraints for extracting probability measures for cold, dense nuclear matter equations of state. One of the key…
Bayesian Analysis of Hybrid EoS based on Astrophysical Observational Data
David Alvarez-Castillo, Alexander Ayriyan, David Blaschke +1
We perform a Bayesian analysis of probability measures for compact star equations of state using new, disjunct constraints for mass and radius. The analysis uses a simple parametri…
Mass and radius constraints for compact stars and the QCD phase diagram
David B. Blaschke, Hovik A. Grigorian, David E. Alvarez-Castillo +1
We suggest a new Bayesian analysis using disjunct M-R constraints for extracting probability measures for cold, dense matter equations of state. One of the key issues of such an an…