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Naked Singularity

Author : DreamingBear Baraka Kanaan
ISBN : 9781462051892
Genre : Science
File Size : 74.88 MB
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In general relativity, a naked singularity is a gravitational singularity, without an event horizon. In a black hole, there is a region around the singularity, the event horizon, where the gravitational force of the singularity is strong enough so that light cannot escape. Hence, the singularity cannot be directly observed. A naked singularity, by contrast, is observable from the outside. The theoretical existence of naked singularities is important because their existence would mean that it would be possible to observe the collapse of an object to infinite density. It would also cause foundational problems for general relativity, because in the presence of a naked singularity, general relativity cannot make predictions about the future evolution of spacetime. Some research has suggested that if loop quantum gravity is correct, then naked singularities could exist in nature, implying that the cosmic censorship hypothesis does not hold. Numerical calculations and some other arguments have also hinted at this possibility. To this date, no naked singularities (and no event horizons) have been observed.
Category: Science

A Naked Singularity

Author : Sergio De La Pava
ISBN : 9781782066569
Genre : Fiction
File Size : 72.61 MB
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Casi is a hotshot public defender working on the front line of America's War on Drugs. So far he's on the winning side. He's never lost a case. But nothing lasts forever, and pride like his has a long way to fall. Funny, smart and always surprising, A Naked Singularity speaks a language all of its own and reads like nothing else ever written. Casi's beautiful mind and planetary intelligence make him an inimitable and unforgettable narrator. In De La Pava's hands, the labyrinthine miseries of the New York Justice System are as layered and diabolical as Dante's nine circles of Hell. But the Devil doesn't hog the best lines. There are plenty here to go around.
Category: Fiction

Naked Singularity

Author : Victoria N. Alexander
ISBN : 9781504012270
Genre : Fiction
File Size : 20.60 MB
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When Hali’s father asks her to help him commit suicide to spare the family the misery of a long illness, she reluctantly agrees. Hali’s family insists on letting “God’s will” decide. Hali, brooding upon the idea of predetermination and an afterlife in a way that is both challenging and deeply moving, is ultimately unable to do what her father wishes. She is forced to accept the help of a manipulative male nurse, adding further complications and a slow and painful end.
Category: Fiction

The Story Of Collapsing Stars

Author : Pankaj S. Joshi
ISBN : 9780199686766
Genre : Nature
File Size : 47.62 MB
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This book describes some of the most fascinating occurences in the universe - black holes and space-time singularities. These arise when massive stars reach the end of their life cycle and collapse and shrink under their own gravity as they exhaust their supply of internal nuclear fuel. A star that was once millions of kilometers in size shrinks to a pinprick smaller than the dot on an "i". This is the space-time singularity, an extreme region of the universewhere densities, temperatures, and all other physical quantities take arbitrarily large values. According to Einstein's theory of gravity, the singularity is either covered within an event horizon, thusgiving a black hole, or it can be a visible naked singularity. The final fate of the star depends on its internal structure. In cases of the singularity being visible to faraway observers in the universe, we have the possibility to witness the workings of quantum gravity effects. Such observational signatures related to how the gravity and quantum may operate together could help us formulate the quantum gravity theory, a long cherished dream of physicists. Thus these issues are found to beintimately related to our search for the Unification of Physics, understanding all the basic forces in nature in a single theoretical framework.
Category: Nature

Black Hole Physics

Author : V. Frolov
ISBN : 0792351452
Genre : Science
File Size : 84.41 MB
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This volume on black holes can be seen as a sequel to Physics of Black Holes, published by Kluwer Academic Publishers in 1989. The authors are recognised experts in their field, and have many years' experience in teaching courses on general relativity and black holes. The present work covers practically all aspects of black hole physics and its astrophysical applications. Among the topics treated in depth are: spacetime of stationary black holes, general theory of black holes, black hole perturbations, black hole numerics, black hole electrodynamics, black holes in unified theories of gravity, quantum black holes, final states of evaporating black holes and the information loss puzzle. Special attention is paid to the role of black holes in astrophysics and observational evidence of black hole existence. Many exotic subjects linked with black holes, such as white holes, wormholes, and time machines are discussed in detail. Numerous appendices cover mathematical aspects of general relativity and black holes and quantum field theory in curved space time. This makes the book practically self-contained. Extensive references provide the reader with a guide to the literature in this field. Audience: This book will be of interest to researchers and postgraduate students whose work involves relativity and gravitation, statistical physics, thermodynamics, active galactic nuclei and stellar physics.
Category: Science

Naked Singularity

Author :
ISBN : OCLC:181645363
Genre : Fan magazines
File Size : 53.79 MB
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Category: Fan magazines

General Relativity And Gravitation 1992 Proceedings Of The Thirteenth Int Conference On General Relativity And Gravitation Held At Cordoba Argentina 28 June July 4 1992

Author : R.J. Gleiser
ISBN : 0750302615
Genre : Science
File Size : 29.25 MB
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General Relativity and Gravitation 1992 contains the best of 700 papers presented at the tri-annual INT conference, generally recognized as the key conference in the area. The plenary and invited papers are published in full, along with summaries of parallel symposia and workshops. The list of plenary speakers is as impressive as ever, with contributions from Jim Hartle, Roger Penrose, and Lee Smolin among many others.
Category: Science

Bangs Crunches Whimpers And Shrieks

Author : John Earman
ISBN : 0195344642
Genre : Science
File Size : 58.85 MB
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Almost from its inception, Einstein's general theory of relativity was known to sanction spacetime models harboring singularities. Until the 1960s, however, spacetime singularities were thought to be artifacts of the idealizations of the models. This attitude evaporated in the face of a series of theorems, due largely to Stephen Hawking and Roger Penrose, which showed that Einstein's general theory implies that singularities can be expected to occur in a wide variety of conditions in both gravitational collapse and in cosmology. In the light of these results some physicists adopted the attitude that, since spacetime singularities are intolerable, general relativity contains within itself the seeds of its own destruction. Others hoped that peaceful coexistence with singularities could be achieved by proving a form of Roger Penrose's cosmic censorship hypothesis, which would place singularities safely inside black holes. Whatever the attitude one adopts toward spacetime singularities, it is evident that they raise a number of foundational problems for physics and have profound implications for the philosophy of space and time. However, philosophers of science have been slow to awaken to the significance of these developments. Indeed, this is the first serious book-length study of the subject by a philosopher of science. It features an overview of the literature on singularities, as well as an analytic commentary on their significance to a number of scientific and philosophical issues.
Category: Science

Observational Distinction Between Black Holes And Naked Singularities The Role Of The Redshift Function

Author :
ISBN : OCLC:1051937989
Genre :
File Size : 21.50 MB
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Abstract: We suggest that the redshift of photons traveling from past to future null infinity through a collapsing object could provide an observational signature capable of differentiating between the formation of a globally naked singularity and the formation of an event horizon. Supporting evidence for this idea is drawn from the analysis of photons with zero angular momentum through the center of a collapsing spherical dust cloud. We show that the frequency shift as a function of proper time with respect to stationary observers has distinct features depending on whether the object collapses to a black hole or a naked singularity.