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This book journeys into one of the most fascinating intellectual
adventures of recent decades - understanding and exploring the
final fate of massive collapsing stars in the universe. The issue
is of great interest in fundamental physics and cosmology today,
from both the perspective of gravitation theory and of modern
astrophysical observations. This is a revolution in the making and
may be intimately connected to our search for a unified
understanding of the basic forces of nature, namely gravity that
governs the cosmological universe, and the microscopic forces that
include quantum phenomena. According to the general theory of
relativity, a massive star that collapses catastrophically under
its own gravity when it runs out of its internal nuclear fuel must
give rise to a space-time singularity. Such singularities are
regions in the universe where all physical quantities take their
extreme values and become arbitrarily large. The singularities may
be covered within a black hole, or visible to faraway observers in
the universe. Thus, the final fate of a collapsing massive star is
either a black hole or a visible naked singularity. We discuss here
recent results and developments on the gravitational collapse of
massive stars and possible observational implications when naked
singularities happen in the universe. Large collapsing massive
stars and the resulting space-time singularities may even provide a
laboratory in the cosmos where one could test the unification
possibilities of basic forces of nature.
This book journeys into one of the most fascinating intellectual
adventures of recent decades - understanding and exploring the
final fate of massive collapsing stars in the universe. The issue
is of great interest in fundamental physics and cosmology today,
from both the perspective of gravitation theory and of modern
astrophysical observations. This is a revolution in the making and
may be intimately connected to our search for a unified
understanding of the basic forces of nature, namely gravity that
governs the cosmological universe, and the microscopic forces that
include quantum phenomena. According to the general theory of
relativity, a massive star that collapses catastrophically under
its own gravity when it runs out of its internal nuclear fuel must
give rise to a space-time singularity. Such singularities are
regions in the universe where all physical quantities take their
extreme values and become arbitrarily large. The singularities may
be covered within a black hole, or visible to faraway observers in
the universe. Thus, the final fate of a collapsing massive star is
either a black hole or a visible naked singularity. We discuss here
recent results and developments on the gravitational collapse of
massive stars and possible observational implications when naked
singularities happen in the universe. Large collapsing massive
stars and the resulting space-time singularities may even provide a
laboratory in the cosmos where one could test the unification
possibilities of basic forces of nature.
Physical phenomena in astrophysics and cosmology involve
gravitational collapse in a fundamental way. The final fate of a
massive star when it collapses under its own gravity at the end of
its life cycle is one of the most important questions in
gravitation theory and relativistic astrophysics, and is the
foundation of black hole physics. General relativity predicts that
continual gravitational collapse gives rise to a space-time
singularity. Quantum gravity may take over in such regimes to
resolve the classical space-time singularity. This book
investigates these issues, and shows how the visible ultra-dense
regions arise naturally and generically as an outcome of dynamical
gravitational collapse. It will be of interest to graduate students
and academic researchers in gravitation physics, fundamental
physics, astrophysics, and cosmology. It includes a detailed review
of research into gravitational collapse, and several examples of
collapse models are investigated in detail.
Physical phenomena in astrophysics and cosmology involve
gravitational collapse in a fundamental way. The final fate of a
massive star when it collapses under its own gravity at the end of
its life cycle is one of the most important questions in
gravitation theory and relativistic astrophysics, and is the
foundation of black hole physics. General relativity predicts that
continual gravitational collapse gives rise to a space-time
singularity. Quantum gravity may take over in such regimes to
resolve the classical space-time singularity. This book
investigates these issues, and shows how the visible ultra-dense
regions arise naturally and generically as an outcome of dynamical
gravitational collapse. It will be of interest to graduate students
and academic researchers in gravitation physics, fundamental
physics, astrophysics, and cosmology. It includes a detailed review
of recent research into gravitational collapse, and several
examples of collapse models are investigated in detail.
Basic to the entire theory and applications of black hole physics
Global Aspects in Gravitation and Cosmology covers the topics
needed to understand the current key issues in gravitation theory:
cosmology and black holes. Emphasized is the basic theme that the
very nature of the gravitational field is such that global features
of space-time inevitably come into play whenever we try to
understand and interpret this force in detail. After discussing the
fundamental role played by global considerations in gravity and
general relativity, Joshi points out the significant problems that
remain. The key problem of which been the issue of quantum effects
in strong gravity fields, an understanding of which is essential to
formulate any quantum theory of gravity. This book will be
beneficial to mathematicians and physicists.
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