Population Synthesis of Neutron Stars, Strange (Quark) Stars, and Black Holes

2002 ◽  
Vol 567 (1) ◽  
pp. L63-L66 ◽  
Author(s):  
Krzysztof Belczynski ◽  
Tomasz Bulik ◽  
Włodzimierz Kluźniak
Keyword(s):  
Black Holes ◽  
Neutron Stars ◽  
Strange Quark ◽  
Population Synthesis ◽  
Quark Stars

scholarly journals Structure of Quark Stars

2012 ◽  
Vol 8 (S291) ◽  
pp. 61-66 ◽  
Author(s):  
Fridolin Weber ◽  
Milva Orsaria ◽  
Hilario Rodrigues ◽  
Shu-Hua Yang
Keyword(s):  
Neutron Stars ◽  
Electric Fields ◽  
Heavy Ions ◽  
Strange Quark ◽  
Electron Gas ◽  
Central Star ◽  
Strange Quarks ◽  
Quark Stars ◽  
Star Density ◽  
High Electric Fields

AbstractThis paper gives an brief overview of the structure of hypothetical strange quarks stars (quark stars, for short), which are made of absolutely stable 3-flavor strange quark matter. Such objects can be either bare or enveloped in thin nuclear crusts, which consist of heavy ions immersed in an electron gas. In contrast to neutron stars, the structure of quark stars is determined by two (rather than one) parameters, the central star density and the density at the base of the crust. If bare, quark stars possess ultra-high electric fields on the order of 1018 to 1019 V/cm. These features render the properties of quark stars more multifaceted than those of neutron stars and may allow one to observationally distinguish quark stars from neutron stars.

scholarly journals Strange Quark Stars — A Review

2003 ◽  
Vol 214 ◽  
pp. 191-198 ◽  
Author(s):  
R. X. Xu
Keyword(s):  
Neutron Stars ◽  
Quark Matter ◽  
Strange Quark ◽  
Major Part ◽  
Strange Quark Matter ◽  
Strange Stars ◽  
Quark Stars

A pedagogical overview of strange quark matter and strange stars is presented. After a historical notation of the research and an introduction to quark matter, a major part is devoted to the physics and astrophysics of strange stars, with attention being paid to the possible ways by which neutron stars and strange stars can be distinguished in astrophysics. Recent possible evidence for bare strange stars is also discussed.

scholarly journals QUARK STARS AND QUANTUM-MAGNETICALLY INDUCED COLLAPSE

2005 ◽  
Vol 14 (11) ◽  
pp. 1959-1969 ◽  
Author(s):  
A. PÉREZ MARTÍNEZ ◽  
H. PÉREZ ROJAS ◽  
H. J. MOSQUERA CUESTA ◽  
M. BOLIGAN ◽  
M. G. ORSARIA
Keyword(s):  
Neutron Stars ◽  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
Quark Matter ◽  
Strange Quark ◽  
Vacuum Energy Density ◽  
Bag Model ◽  
X Ray ◽  
Quark Stars ◽  
Mit Bag Model

Quark matter is expected to exist in the interior of compact stellar objects as neutron stars or even the more exotic strange stars, based on the Bodmer–Witten conjecture. Bare strange quark stars and (normal) strange quark-matter stars, those possessing a baryon (electron-supported) crust, are hypothesized as good candidates to explain the properties of a set of peculiar stellar sources such as the enigmatic X-ray source RX J1856.5-3754, some pulsars such as PSR B1828-11 and PSR B1642-03, and the anomalous X-ray pulsars and soft γ-ray repeaters. In the MIT bag model, quarks are treated as a degenerate Fermi gas confined to a region of space having a vacuum energy density B bag (the Bag constant). In this note, we modify the MIT bag model by including the electromagnetic interaction. We also show that this version of the MIT model implies the anisotropy of the bag pressure due to the presence of the magnetic field. The equations of state of the degenerate quarks gases are studied in the presence of ultra strong magnetic fields. The behavior of a system made up of quarks having (or not) anomalous magnetic moment is reviewed. A structural instability is found, which is related to the anisotropic nature of the pressures in this highly magnetized matter. The conditions for the collapse of this system are obtained and compared to a previous model of neutron stars that is built on a neutron gas having anomalous magnetic moment.

scholarly journals Modeling the outcome of supernova explosions in binary population synthesis using the stellar compactness

2021 ◽  
Author(s):  
Maciej Dabrowny ◽  
Nicola Giacobbo ◽  
Davide Gerosa
Keyword(s):  
Black Holes ◽  
Neutron Stars ◽  
Binary Stars ◽  
Compact Objects ◽  
Population Synthesis ◽  
Subsequent Formation ◽  
Compact Binaries ◽  
Mass Gap ◽  
Supernova Explosions

AbstractFollowing the collapse of their cores, some of the massive binary stars that populate our Universe are expected to form merging binaries composed of black holes and neutron stars. Gravitational-wave observations of the resulting compact binaries can reveal precious details on the inner workings of the supernova mechanism and the subsequent formation of compact objects. Within the framework of the population-synthesis code mobse, we present the implementation of a new supernova model that relies on the compactness of the collapsing star. The model has two free parameters, namely the compactness threshold that separates the formation of black holes and that of neutron stars, and the fraction of the envelope that falls back onto the newly formed black holes. We compare this model extensively against other prescriptions that are commonly used in binary population synthesis. We find that the cleanest signatures of the role of the pre-supernova stellar compactness are (1) the relative formation rates of the different kinds of compact binaries, which mainly depend on the compactness threshold parameter, and (2) the location of the upper edge of the mass gap between the lightest black holes and the heaviest neutron stars, which mainly depends on the fallback fraction.

scholarly journals Properties of high-density matter in neutron stars

2014 ◽  
Vol 29 (23) ◽  
pp. 1430022 ◽  
Author(s):  
Fridolin Weber ◽  
Gustavo A. Contrera ◽  
Milva G. Orsaria ◽  
William Spinella ◽  
Omair Zubairi
Keyword(s):  
Neutron Stars ◽  
Strange Quark ◽  
Complex Structure ◽  
Short Review ◽  
Compact Stars ◽  
Baryonic Matter ◽  
Quark Stars ◽  
Quark Deconfinement ◽  
Density Matter

This short review aims at giving a brief overview of various states of matter that have been suggested to exist in the ultra-dense centers of neutron stars. Particular emphasis is put on the role of quark deconfinement in neutron stars and on the possible existence of compact stars made of absolutely stable strange quark matter (strange stars). Astrophysical phenomena, which distinguish neutron stars from quark stars, are discussed and the question of whether or not quark deconfinement may occur in neutron stars is investigated. Combined with observed astrophysical data, such studies are invaluable to delineate the complex structure of compressed baryonic matter and to put firm constraints on the largely unknown equation of state of such matter.

scholarly journals Binary population synthesis with probabilistic remnant mass and kick prescriptions

2020 ◽  
Vol 500 (1) ◽  
pp. 1380-1384
Author(s):  
Ilya Mandel ◽  
Bernhard Müller ◽  
Jeff Riley ◽  
Selma E de Mink ◽  
Alejandro Vigna-Gómez ◽  
...  
Keyword(s):  
Black Holes ◽  
Neutron Stars ◽  
Population Synthesis ◽  
Common Envelope ◽  
Low Mass ◽  
The Common ◽  
The Masses ◽  
The Impact ◽  
Hertzsprung Gap ◽  
Remnant Mass

ABSTRACT We report on the impact of a probabilistic prescription for compact remnant masses and kicks on massive binary population synthesis. We find that this prescription populates the putative mass gap between neutron stars and black holes with low-mass black holes. However, evolutionary effects reduce the number of X-ray binary candidates with low-mass black holes, consistent with the dearth of such systems in the observed sample. We further find that this prescription is consistent with the formation of heavier binary neutron stars such as GW190425, but overpredicts the masses of Galactic double neutron stars. The revised natal kicks, particularly increased ultra-stripped supernova kicks, do not directly explain the observed Galactic double neutron star orbital period–eccentricity distribution. Finally, this prescription allows for the formation of systems similar to the recently discovered extreme mass ratio binary GW190814, but only if we allow for the survival of binaries in which the common envelope is initiated by a donor crossing the Hertzsprung gap, contrary to our standard model.

scholarly journals DISTINGUISHING BARE QUARK STARS FROM NEUTRON STARS

2004 ◽  
Vol 19 (31) ◽  
pp. 5335-5342 ◽  
Author(s):  
P. JAIKUMAR ◽  
C. GALE ◽  
D. PAGE ◽  
M. PRAKASH
Keyword(s):  
Neutron Star ◽  
Neutron Stars ◽  
Strange Quark ◽  
Spectral Characteristics ◽  
Extended Period ◽  
Complete Characterization ◽  
Quark Star ◽  
Quark Stars ◽  
Shed Light

Observations to date cannot distinguish neutron stars from self-bound bare quark stars on the basis of their gross physical properties such as their masses and radii alone. However, their surface luminosity and spectral characteristics can be significantly different. Unlike a normal neutron star, a bare quark star can emit photons from its surface at super-Eddington luminosities for an extended period of time. We present a calculation of the photon bremsstrahlung rate from the bare quark star's surface, and indicate improvements that are required for a complete characterization of the spectrum. The observation of this distinctive photon spectrum would constitute an unmistakable signature of a strange quark star and shed light on color superconductivity at stellar densities.

scholarly journals A binary population synthesis study on gravitational wave sources

2015 ◽  
Vol 11 (A29B) ◽  
pp. 365-366
Author(s):  
Liu Jinzhong ◽  
Zhang Yu
Keyword(s):  
Black Holes ◽  
Neutron Stars ◽  
Gravitational Wave ◽  
Gamma Ray ◽  
Theoretical Study ◽  
Compact Objects ◽  
Population Synthesis ◽  
Observational Astronomy ◽  
X Ray ◽  
X Ray Binaries

AbstractGravitational waves (GW) are a natural consequence of Einstein's theory of gravity (general relativity), and minute distortions of space-time. Gravitational Wave Astronomy is an emerging branch of observational astronomy which aims to use GWs to collect observational data about objects such as neutron stars and black holes, about events such as supernovae and about the early universe shortly after the big bang.This field will evolve to become an established component of 21st century multi-messenger astronomy, and will stand shoulder-to-shoulder with gamma-ray, x-ray, optical, infrared and radio astronomers in exploring the cosmos. In this paper, we state a recent theoretical study on GW sources, and present the results of our studies on the field using a binary population synthesis (BPS) approach, which was designed to investigate the formation of many interesting binary-related objects, including close double white dwarfs, AM CVn stars, ultra-compact X-ray binaries(UCXBs), double neutron stars, double stellar black holes. Here we report how BPS can be used to determine the GW radiation from double compact objects.

SCALING PROPERTY IN COLD COMPACT STARS

2000 ◽  
Vol 15 (20) ◽  
pp. 1341-1346 ◽  
Author(s):  
R. SHARMA ◽  
S. MUKHERJEE ◽  
S. D. MAHARAJ
Keyword(s):  
Neutron Stars ◽  
Strange Quark ◽  
Scaling Behavior ◽  
Exotic Matter ◽  
Compact Stars ◽  
Bag Model ◽  
Model Calculations ◽  
Quark Stars ◽  
Scaling Property ◽  
Simple Scaling

We point out a simple scaling property in the mass–radius relationship in cold compact stars. This property my be considered as a generalization of the scaling observed by Witten for strange quark stars. A particular model which explicitly exhibits this scaling behavior has been discussed. The model is relevant for neutron stars as well as stars made up of exotic matter, in particular, quark stars and other composites based on Bag model calculations.

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