113 citations · 571 across the 33 of their papers we have counts for
34 papers
Bayesian Constraints on Bosonic Dark Matter in Neutron Stars within a Covariant Density-Functional Equation-of-State Ensemble
Davood Rafiei Karkevandi, Alexander Ayriyan, Armen Sedrakian
We investigate neutron stars admixed with repulsively self-interacting bosonic dark matter (DM) using current multi-messenger observations. The dark component is modeled as a compl…
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 inference favors quark matter in neutron star interiors
Alexander Ayriyan, Oleksii Ivanytskyi, David Blaschke
We perform a physics-informed Bayesian analyses of the equation of state of hybrid neutron stars that incorporates color-flavor-locked quark matter modeled by a three-flavor non-lo…
Bayesian analysis of hybrid neutron star EOS constraints within an instantaneous nonlocal chiral quark matter model
Alexander Ayriyan, David Blaschke, Juan Pablo Carlomagno +2
We present a physics-informed Bayesian analysis of equation of state constraints using observational data for masses, radii and tidal deformability of pulsars and a generic class o…
Observational Probes of the Neutron Star Equation of State with Hyperons, Bosonic Dark Matter, and Quark Matter
Mahboubeh Shahrbaf, Davood Rafiei Karkevandi, Alexander Ayriyan +1
Context. The presence of dark matter in neutron stars is of growing interest due to its potential impact on the structure and observable properties of these objects. Among the vari…
Special point "trains" in the M-R diagram of hybrid stars
David Blaschke, Alexander Ayriyan, Mateusz Cierniak +3
We present a systematic investigation of the possible locations for the special point (SP), a unique feature of hybrid neutron stars in the mass-radius diagram. The study is perfor…
Constraining free parameters of a color superconducting non-local Nambu-Jona-Lasinio model using Bayesian analysis of neutron stars mass and radius measurements
Mahboubeh Shahrbaf, Sofija Antić, A. Ayriyan +2
We provide a systematic study of hybrid neutron star equations of state (EoS) consisting of a relativistic density functional for the hadronic phase and a covariant nonlocal Nambu-…
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…
Performance Analysis of Effective Symbolic Methods for Solving Band Matrix SLAEs
Milena Veneva, Alexander Ayriyan
This paper presents an experimental performance study of implementations of three symbolic algorithms for solving band matrix systems of linear algebraic equations with heptadiagon…
Symbolic Algorithm for Solving SLAEs with Heptadiagonal Coefficient Matrices
Milena Veneva, Alexander Ayriyan
This paper presents a symbolic algorithm for solving band matrix systems of linear algebraic equations with heptadiagonal coefficient matrices. The algorithm is given in pseudocode…
Hybrid equation of state with pasta phases and third family of compact stars
K. Maslov, N. Yasutake, A. Ayriyan +5
The effect of pasta phases on the quark-hadron phase transition is investigated for a set of relativistic mean-field equations of state for both hadron and quark matter. The result…
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…
Performance Analysis of Effective Methods for Solving Band Matrix SLAEs after Parabolic Nonlinear PDEs
Milena Veneva, Alexander Ayriyan
This paper presents an experimental performance study of implementations of three different types of algorithms for solving band matrix systems of linear algebraic equations (SLAEs…
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…
Robustness of third family solutions for hybrid stars against mixed phase effects
A. Ayriyan, N. -U. Bastian, D. Blaschke +3
We investigate the robustness of third family solutions for hybrid compact stars with a quark matter core that correspond to the occurrence of high-mass twin stars against a soften…
Effective Methods for Solving Band SLEs after Parabolic Nonlinear PDEs
Milena Veneva, Alexander Ayriyan
A class of models of heat transfer processes in a multilayer domain is considered. The governing equation is a nonlinear heat-transfer equation with different temperature-dependent…
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…
OpenCL/CUDA algorithms for parallel decoding of any irregular LDPC code using GPU
Jan Broulim, Alexander Ayriyan, Vjaceslav Georgiev +1
The development of multicore architectures supporting parallel data processing has led to a paradigm shift, which affects communication systems significantly. This article provides…