Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781792639746
Category :
Languages : en
Pages : 28
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The concept of a primordial blackhole fluid with intrinsic spin density is examined along with its consequence for supercluster-sized, i.e., large scale voids, and the missing mass question. Smalley, Larry L. Marshall Space Flight Center NASA-TM-101788, NAS 1.15:101788 ...
Author: Larry L. Smalley
Publisher:
ISBN:
Category : Black holes (Astronomy)
Languages : en
Pages : 24
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
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Author: Ram Babu Sao
Publisher: Createspace Independent Publishing Platform
ISBN: 9781984153401
Category :
Languages : en
Pages : 448
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Book Description
The whole universe is full of miracles. The Massive Black holes are massive objects collections of mass, with gravity so strong that nothing can escape, not even light. Black holes are among the strangest things in the universe. The most common types of black holes are the stellar-mass and super massive black holes. Stellar, mass black holes, are created when massive stars explode, leaving behind a black hole with the mass of just a few suns. "These are incredibly fast-moving objects that are actually gravitationally unbound to the Milky Way." Though these speed demons may be close to the black hole, they are not shrouded by dust and can be detected with telescopes. A stellar black hole can be seen when it rips a companion star to pieces. When a massive star explodes, not all the material is ejected into space. Some of it collapses into an extremely compact object known as a neutron star, inside which gravitational forces crush protons and electrons together, turning them into particles known as neutrons. A neutron star contains a few solar masses of material squeezed into a radius of only 20 km. This means the matter is so compressed that a thimble full of it would weigh millions of tonnes on Earth. Fast-spinning neutron stars, whose radio emissions seem to pulse on and off, are called pulsars. Quasars is the brightest objects in the universe, they shine anywhere from 10 to 100,000 times brighter than the Milky Way. Shining so brightly that they eclipse the ancient galaxies that contain them, quasars are distant objects powered by black holes a billion times as massive as our sun. These powerful dynamos have fascinated astronomers since their discovery half a century ago. Light-speed jets, the tiny point-like glimmers, are actually signals from galactic nuclei outshining their host galaxies. Quasars live only in galaxies with super massive black holes, black holes that contain billions of times the mass of the sun. Although light cannot escape from the black hole itself, some signals can break free around its edges. While some dust and gas fall into the black hole, other particles are accelerated away from it at near the speed of light. The particles stream away from the black hole in jets above and below it, transported by one of the most powerful partiparticle accelerators in the universe.
Author: Richard Brito
Publisher: Springer Nature
ISBN: 3030466221
Category : Science
Languages : en
Pages : 293
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This book focuses on one mechanism in black hole physics which has proven to be universal, multifaceted and with a rich phenomenology: rotational superradiance. This is an energy extraction process, whereby black holes can deposit their rotational energy in their surroundings, leading to Penrose processes, black-hole bombs, and even Hawking radiation. Black holes are key players in star formation mechanisms and as engines to some of the most violent events in our universe. Their simplicity and compactness make them perfect laboratories, ideally suited to probe new fields or modifications to the theory of gravity. Thus, black holes can also be used to probe some of the most important open problems in physics, including the nature of dark matter or the strong CP problem in particle physics. This monograph is directed to researchers and graduate students and provides a unified view of the subject, covering the theoretical machinery, experimental efforts in the laboratory, and astrophysics searches. It is focused on recent developments and works out a number of novel examples and applications, ranging from fundamental physics to astrophysics. Non-specialists with a scientific background should also find this text a valuable resource for understanding the critical issues of contemporary research in black-hole physics. This second edition stresses the role of ergoregions in superradiance, and completes its catalogue of energy-extraction processes. It presents a unified description of instabilities of spinning black holes in the presence of massive fields. Finally, it covers the first experimental observation of superradiance, and reviews the state-of-the-art in the searches for new light fields in the universe using superradiance as a mechanism.
Author: Celestial Angell
Publisher: Dedona Publishing
ISBN:
Category : Science
Languages : en
Pages : 43
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A black hole is a region in space where the gravitational pull is so strong that nothing, not even light, can escape from it. This occurs when a massive amount of matter is compressed into a very small area, creating a powerful gravitational field. Black holes form through various processes that involve the collapse of massive astronomical objects and the merging of smaller black holes. One primary method is the stellar collapse. Stars, during their lifecycle, fuse hydrogen into helium in their cores. When the hydrogen is depleted, they begin fusing heavier elements until iron is produced. For stars more than 20 times the mass of the Sun, the end of this fusion process leads to a supernova explosion. The core of the star collapses rapidly due to gravity, and if the core's mass is sufficiently large (typically more than about three times the mass of the Sun), it will continue collapsing into a singularity, forming a stellar-mass black hole. Another way black holes can form is through accretion and growth. A compact object like a neutron star or a white dwarf can accumulate matter from a companion star or its surroundings. As this matter accumulates, the mass of the compact object increases, and it may eventually reach a critical mass where it collapses into a black hole.
Author: Cosimo Bambi
Publisher: Springer
ISBN: 9811045240
Category : Science
Languages : en
Pages : 340
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This textbook introduces the current astrophysical observations of black holes, and discusses the leading techniques to study the strong gravity region around these objects with electromagnetic radiation. More importantly, it provides the basic tools for writing an astrophysical code and testing the Kerr paradigm. Astrophysical black holes are an ideal laboratory for testing strong gravity. According to general relativity, the spacetime geometry around these objects should be well described by the Kerr solution. The electromagnetic radiation emitted by the gas in the inner part of the accretion disk can probe the metric of the strong gravity region and test the Kerr black hole hypothesis. With exercises and examples in each chapter, as well as calculations and analytical details in the appendix, the book is especially useful to the beginners or graduate students who are familiar with general relativity while they do not have any background in astronomy or astrophysics.“/p>
Author: Jean-Pierre Luminet
Publisher: Cambridge University Press
ISBN: 9780521409063
Category : Science
Languages : en
Pages : 338
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Book Description
Black holes are undoubtedly one of the most fascinating discoveries of modern astronomy, and their description one of the most daring intellectual feats of modern times. They have already become legendary, forming the basis of many myths, fantasies and science fiction movies. Are they really the monsters which devour light and stars; bottomless celestial pits into which all matter is sucked and crushed? Are they an observable reality, or are they just hypothetical objects from the theory of relativity? In answering such questions the author takes us on a fabulous journey through space and time. Dr Jean-Pierre Luminet is an astronomer at Meudon Observatory in France, a specialist on the subject of black holes, and has also acquired a reputation for being a gifted writer and communicator. In this book he makes the subject of black holes accessible to any interested reader, who will need no mathematical background.
Author: Fulvio Melia
Publisher: Princeton University Press
ISBN: 9780691131290
Category : Science
Languages : en
Pages : 324
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1134
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