The Black Hole Neutron Star Binary Merger In Full General Relativity
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| Author | : Koutarou Kyutoku |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 187 |
| Release | : 2013-01-11 |
| Genre | : Science |
| ISBN | : 4431542019 |
Download The Black Hole-Neutron Star Binary Merger in Full General Relativity Book in PDF, Epub and Kindle
This thesis presents a systematic study of the orbital evolution, gravitational wave radiation, and merger remnant of the black hole–neutron star binary merger in full general relativity for the first time. Numerical-relativity simulations are performed using an adaptive mesh refinement code, SimulAtor for Compact objects in Relativistic Astrophysics (SACRA), which adopts a wide variety of zero-temperature equations of state for the neutron star matter. Gravitational waves provide us with quantitative information on the neutron star compactness and equation of state via the cutoff frequency in the spectra, if tidal disruption of the neutron star occurs before the binary merges. The cutoff frequency will be observed by next-generation laser interferometric ground-based gravitational wave detectors, such as Advanced LIGO, Advanced VIRGO, and KAGRA. The author has also determined that the mass of remnant disks are sufficient for the remnant black hole accretion disk to become a progenitor of short-hard gamma ray bursts accompanied by tidal disruptions and suggests that overspinning black holes may not be formed after the merger of even an extremely spinning black hole and an irrotational neutron star.
| Author | : Koutarou Kyutoku |
| Publisher | : |
| Total Pages | : 194 |
| Release | : 2013-01-11 |
| Genre | : Black holes (Astronomy) |
| ISBN | : 9784431542025 |
Download The Black Hole-Neutron Star Binary Merger in Full General Relativity Book in PDF, Epub and Kindle
| Author | : Francois Foucart |
| Publisher | : |
| Total Pages | : 226 |
| Release | : 2011 |
| Genre | : |
| ISBN | : |
Download Numerical Studies of Black Hole-neutron Star Binaries Book in PDF, Epub and Kindle
Black hole-neutron star mergers are extremely energetic events with the potential to generate gravitational waves detectable by ground-based detectors. They can also form massive, hot accretion discs around a remnant black hole, which could power short gamma-ray bursts. Due to the strength of the gravitational interactions around the time of merger, black hole-neutron star binaries can only be studied in a general relativistic framework -- and as we lack analytical solutions to Einstein's equations of general relativity in the case of binary systems, numerical simulations are required to determine their evolution. In this thesis, we study black hole-neutron star binaries using the SpEC code. We show how to efficiently and accurately determine the initial conditions for numerical simulations, and study the influence on the dynamics of black hole-neutron star mergers of both the equation of state of nuclear matter - which is unknown but could be constrained through observations of compact binaries - and the spin of the black hole. We find that the dynamics of mergers is strongly affected by the radius of the star: small stars are harder to disrupt, form lower-mass discs and emit waves longer (and at higher frequency) than large stars. The component of the black hole spin aligned with the orbital angular momentum of the binary also modifies the disk formation process: high spins let the star approach closer to the black hole without plunging into it, subjecting it to stronger tidal forces and making it easier for the star to disrupt and form a massive disk.
| Author | : Chryssa Kouveliotou |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 546 |
| Release | : 2001-12-31 |
| Genre | : Science |
| ISBN | : 9781402002052 |
Download The Neutron Star-Black Hole Connection Book in PDF, Epub and Kindle
The foremost observers and theorists discuss the latest developments in the astrophysics of neutron stars, black holes and their interaction in the universe. Often found in compact, interacting binaries, these objects exhibit broadly similar behaviour. The determination of observational signatures that distinguish between these two types of objects is systematically explored. Supernovae and evolutionary scenarios leading to neutron stars and black holes, single or in binaries, are also discussed in detail. There is also a discussion of the decades old mystery of cosmic gamma ray bursts, currently thought to represent enormous stellar explosions at cosmological distances. These could be the result of mergers of a neutron star and its compact binary companion: a literal neutron star-black hole connection. A lucid series of lectures for the advanced graduate student. A unifying text that will appeal to the research astrophysicist and space physicist.
| Author | : Matthew Karlson |
| Publisher | : |
| Total Pages | : 106 |
| Release | : 2018 |
| Genre | : Black holes (Astronomy) |
| ISBN | : |
Download Gravitational-wave Memory from Black Hole and Neutron Star Mergers Book in PDF, Epub and Kindle
The detection of gravitational waves from binary black hole and binary neutron star mergers has ushered in a new age of observational astronomy. Anticipation of detection from these coalescing compact binaries has led to the development of models for comparison using analytical and numerical techniques. Typically, these methods model gravitational-wave signals as small oscillations that grow over time, reach some maximum value, and eventually decay to zero. However, these models are incomplete: compact binaries can emit gravitational waves that decay to a non-zero value. This phenomenon is known as the gravitational-wave memory. In particular, the signal from compact binaries displays a nonlinear memory effect, which arises from gravitational waves produced by the previously emitted gravitational-wave energy. Using a semi-analytic approach we generate nonlinear memory signals for a range of binary black hole parameters, extending previous work. We also, for the first time, compute the nonlinear memory for binary neutron star mergers. Additionally, we perform the first comparison between our semi-analytic approach and full numerical relativity simulations of the nonlinear memory. These waveforms will be useful in future searches of the nonlinear memory in ground and space-based detectors.
| Author | : Stuart L. Shapiro |
| Publisher | : John Wiley & Sons |
| Total Pages | : 663 |
| Release | : 2008-11-20 |
| Genre | : Science |
| ISBN | : 3527617671 |
Download Black Holes, White Dwarfs, and Neutron Stars Book in PDF, Epub and Kindle
This self-contained textbook brings together many different branches of physics--e.g. nuclear physics, solid state physics, particle physics, hydrodynamics, relativity--to analyze compact objects. The latest astronomical data is assessed. Over 250 exercises.
| Author | : Thomas W. Baumgarte |
| Publisher | : Cambridge University Press |
| Total Pages | : 717 |
| Release | : 2010-06-24 |
| Genre | : Science |
| ISBN | : 1139643177 |
Download Numerical Relativity Book in PDF, Epub and Kindle
Aimed at students and researchers entering the field, this pedagogical introduction to numerical relativity will also interest scientists seeking a broad survey of its challenges and achievements. Assuming only a basic knowledge of classical general relativity, the book develops the mathematical formalism from first principles, and then highlights some of the pioneering simulations involving black holes and neutron stars, gravitational collapse and gravitational waves. The book contains 300 exercises to help readers master new material as it is presented. Numerous illustrations, many in color, assist in visualizing new geometric concepts and highlighting the results of computer simulations. Summary boxes encapsulate some of the most important results for quick reference. Applications covered include calculations of coalescing binary black holes and binary neutron stars, rotating stars, colliding star clusters, gravitational and magnetorotational collapse, critical phenomena, the generation of gravitational waves, and other topics of current physical and astrophysical significance.
| Author | : Luciano Rezzolla |
| Publisher | : Springer |
| Total Pages | : 811 |
| Release | : 2019-01-09 |
| Genre | : Science |
| ISBN | : 3319976168 |
Download The Physics and Astrophysics of Neutron Stars Book in PDF, Epub and Kindle
This book summarizes the recent progress in the physics and astrophysics of neutron stars and, most importantly, it identifies and develops effective strategies to explore, both theoretically and observationally, the many remaining open questions in the field. Because of its significance in the solution of many fundamental questions in nuclear physics, astrophysics and gravitational physics, the study of neutron stars has seen enormous progress over the last years and has been very successful in improving our understanding in these fascinating compact objects. The book addresses a wide spectrum of readers, from students to senior researchers. Thirteen chapters written by internationally renowned experts offer a thorough overview of the various facets of this interdisciplinary science, from neutron star formation in supernovae, pulsars, equations of state super dense matter, gravitational wave emission, to alternative theories of gravity. The book was initiated by the European Cooperation in Science and Technology (COST) Action MP1304 “Exploring fundamental physics with compact stars” (NewCompStar).
| Author | : H. Gursky |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 447 |
| Release | : 2013-04-17 |
| Genre | : Science |
| ISBN | : 9401017670 |
Download Neutron Stars, Black Holes and Binary X-Ray Sources Book in PDF, Epub and Kindle
This book contains a set of articles based on a session of the annual meeting of the American Association for the Advancement of Science held in San Francisco in February, 1974. The reason for the meeting arose from the need to communicate to the largest possible scientific community the dramatic advances which have been made in recent years in the understanding of collapsed objects: neutron stars and black holes. Thanks to an unprecedented resonance between X-ray, y-ray, radio and optical astronomy and important new theoretical developments in relativistic astro physics, a new deep understanding has been acquired of the physical processes oc curring in the late stages of evolution of stars. This knowledge may be one of the greatest conquests of man's understanding of nature in this century. This book aims to give an essential and up-to-date view in this field. The analysis of the physics and astrophysics of neutron stars and black holes is here attacked from both theoretical and experimental points of view. In the experimental field we range from the reviews and catalogues of galactic X-ray sources (R. Gursky and E. Schreier) and pulsars (E. Groth) to the observations of the optical counter part of X-ray sources (P. Boynton) to finally the recently discovered gamma-ray bursts (I. Strong) and pulse astronomy R. B. Partridge).
| Author | : Milad Haddadi |
| Publisher | : |
| Total Pages | : 133 |
| Release | : 2020 |
| Genre | : Accretion (Astrophysics) |
| ISBN | : |
Download Evolution of Black Hole Neutron Star Post-Merger Accretion Disk in Axisymmetry Book in PDF, Epub and Kindle
The remnant accretion disk from a black hole-neutron star binary merger can be responsible for electromagnetic counterparts to a gravitational wave signal. For example, a disk is needed for a short-duration gamma-ray burst, and disk winds can contribute to a kilonova. Numerical relativity simulations provide the only realistic post-merger initial state, but due to the cost of 3D simulations, these usually only cover the first tens of milliseconds. We report on our recent 2D black hole-neutron star post-merger disk simulations in axisymmetric relativistic hydrodynamics. We evolve the disk for a few hundred milliseconds from realistic initial data from 3D simulations. Our post-merger simulations employ an alpha viscosity model to account for angular momentum transport, and they include M1 neutrino transport for a more realistic evolution of the composition in the disk and its ejecta.
