Ashtekar, Abhay
Overview
Works:  44 works in 136 publications in 3 languages and 3,218 library holdings 

Genres:  Conference papers and proceedings Handbooks and manuals 
Roles:  Editor, Author, Thesis advisor, Other 
Publication Timeline
.
Most widely held works about
Abhay Ashtekar
Most widely held works by
Abhay Ashtekar
100 years of relativity : spacetime structure : Einstein and beyond by
Abhay Ashtekar(
)
20 editions published between 2005 and 2006 in English and held by 1,679 WorldCat member libraries worldwide
Divided into three parts, this volume focuses on a summary of how relativity theories were born. It also discusses the ramifications of general relativity, such as black holes, spacetime singularities, gravitational waves, the large scale structure of the cosmos, and more. It includes summaries of radical changes in the notions of space and time
20 editions published between 2005 and 2006 in English and held by 1,679 WorldCat member libraries worldwide
Divided into three parts, this volume focuses on a summary of how relativity theories were born. It also discusses the ramifications of general relativity, such as black holes, spacetime singularities, gravitational waves, the large scale structure of the cosmos, and more. It includes summaries of radical changes in the notions of space and time
Springer handbook of spacetime by
Abhay Ashtekar(
)
15 editions published between 2013 and 2014 in English and German and held by 318 WorldCat member libraries worldwide
The Springer Handbook of Spacetime is dedicated to the groundbreaking paradigm shifts embodied in the two relativity theories, and describes in detail the profound reshaping of physical sciences they ushered in. It includes in a single volume chapters on foundations, on the underlying mathematics, on physical and astrophysical implications, experimental evidence and cosmological predictions, as well as chapters on efforts to unify general relativity and quantum physics. The Handbook can be used as a desk reference by researchers in a wide variety of fields, not only by specialists in relativity but also by researchers in related areas that either grew out of, or are deeply influenced by, the two relativity theories: cosmology, astronomy and astrophysics, high energy physics, quantum field theory, mathematics, and philosophy of science. It should also serve as a valuable resource for graduate students and young researchers entering these areas, and for instructors who teach courses on these subjects. The Handbook is divided into six parts. Part A: Introduction to Spacetime Structure. Part B: Foundational Issues. Part C: Spacetime Structure and Mathematics. Part D: Confronting Relativity theories with observations. Part E: General relativity and the universe. Part F: Spacetime beyond Einstein. Key Topics › Historical origins of the spacetime notion › Basic ideas of special and general relativity › Nature of time and gravity › Mathematical structures › Physical and astrophysical implications › Observational status of the two relativity theories, › Various approaches to unify general relativity and quantum physics. Features › Concise, clear and coherent presentation › Research and applicationoriented › Includes recent developments › Exhaustive references to approved data › All chapters with summaries › A resource for graduate students, researchers and teachers in the field
15 editions published between 2013 and 2014 in English and German and held by 318 WorldCat member libraries worldwide
The Springer Handbook of Spacetime is dedicated to the groundbreaking paradigm shifts embodied in the two relativity theories, and describes in detail the profound reshaping of physical sciences they ushered in. It includes in a single volume chapters on foundations, on the underlying mathematics, on physical and astrophysical implications, experimental evidence and cosmological predictions, as well as chapters on efforts to unify general relativity and quantum physics. The Handbook can be used as a desk reference by researchers in a wide variety of fields, not only by specialists in relativity but also by researchers in related areas that either grew out of, or are deeply influenced by, the two relativity theories: cosmology, astronomy and astrophysics, high energy physics, quantum field theory, mathematics, and philosophy of science. It should also serve as a valuable resource for graduate students and young researchers entering these areas, and for instructors who teach courses on these subjects. The Handbook is divided into six parts. Part A: Introduction to Spacetime Structure. Part B: Foundational Issues. Part C: Spacetime Structure and Mathematics. Part D: Confronting Relativity theories with observations. Part E: General relativity and the universe. Part F: Spacetime beyond Einstein. Key Topics › Historical origins of the spacetime notion › Basic ideas of special and general relativity › Nature of time and gravity › Mathematical structures › Physical and astrophysical implications › Observational status of the two relativity theories, › Various approaches to unify general relativity and quantum physics. Features › Concise, clear and coherent presentation › Research and applicationoriented › Includes recent developments › Exhaustive references to approved data › All chapters with summaries › A resource for graduate students, researchers and teachers in the field
General relativity and gravitation : a centennial perspective(
Book
)
9 editions published in 2015 in English and held by 234 WorldCat member libraries worldwide
Explore spectacular advances in cosmology, relativistic astrophysics, gravitational wave science, mathematics, computational science, and the interface of gravitation and quantum physics with this unique celebration of the centennial of Einstein's discovery of general relativity. Twelve comprehensive and indepth reviews, written by a team of worldleading international experts, together present an uptodate overview of key topics at the frontiers of these areas, with particular emphasis on the significant developments of the last three decades. Interconnections with other fields of research are also highlighted, making this an invaluable resource for both new and experienced researchers. Commissioned by the International Society on General Relativity and Gravitation, and including accessible introductions to cuttingedge topics, ample references to original research papers, and informative colour figures, this is a definitive reference for researchers and graduate students in cosmology, relativity, and gravitational science
9 editions published in 2015 in English and held by 234 WorldCat member libraries worldwide
Explore spectacular advances in cosmology, relativistic astrophysics, gravitational wave science, mathematics, computational science, and the interface of gravitation and quantum physics with this unique celebration of the centennial of Einstein's discovery of general relativity. Twelve comprehensive and indepth reviews, written by a team of worldleading international experts, together present an uptodate overview of key topics at the frontiers of these areas, with particular emphasis on the significant developments of the last three decades. Interconnections with other fields of research are also highlighted, making this an invaluable resource for both new and experienced researchers. Commissioned by the International Society on General Relativity and Gravitation, and including accessible introductions to cuttingedge topics, ample references to original research papers, and informative colour figures, this is a definitive reference for researchers and graduate students in cosmology, relativity, and gravitational science
Revisiting the foundations of relativistic physics : festschrift in honor of John Stachel by
Jürgen Renn(
Book
)
8 editions published between 2003 and 2011 in English and held by 228 WorldCat member libraries worldwide
2) the globalization of capital has far outstripped the ability of current labor movements, organized at best on a national level, to conduct an effective defense of the interests of labor within capitalism, let alone to seriously challenge the cap italist system. To develop some formor formsof international organization of labor, long an ideological challenge ("Workers of the World Unite") has now become an urgent matter of survival for the labor movements of the world. Here is a challenge, on which I think broad agreement is possible: Even those who think capitalism is capable of indefinite survival must agree that it has functioned best in the pastfor example, during the long period of postWorld War II expansion when the power of capital has been effectively limited by the countervailing power of labor. Effective exercise of that power has always depended on overcoming the seg mentation of labor due to such factors as locality, race, gender, occupation, etc. , which stilIremain important. Above, I have singled out the two factors that today seem key to me: the split between mental and manual labor, and segmentation by nationality. Let all concerned about the current state of capitalism work to build up the countervailing power of labor, and let time show whether this results in nothing more than the better functioning of capitalism, or whether a new challenge to the system ultimately emerges
8 editions published between 2003 and 2011 in English and held by 228 WorldCat member libraries worldwide
2) the globalization of capital has far outstripped the ability of current labor movements, organized at best on a national level, to conduct an effective defense of the interests of labor within capitalism, let alone to seriously challenge the cap italist system. To develop some formor formsof international organization of labor, long an ideological challenge ("Workers of the World Unite") has now become an urgent matter of survival for the labor movements of the world. Here is a challenge, on which I think broad agreement is possible: Even those who think capitalism is capable of indefinite survival must agree that it has functioned best in the pastfor example, during the long period of postWorld War II expansion when the power of capital has been effectively limited by the countervailing power of labor. Effective exercise of that power has always depended on overcoming the seg mentation of labor due to such factors as locality, race, gender, occupation, etc. , which stilIremain important. Above, I have singled out the two factors that today seem key to me: the split between mental and manual labor, and segmentation by nationality. Let all concerned about the current state of capitalism work to build up the countervailing power of labor, and let time show whether this results in nothing more than the better functioning of capitalism, or whether a new challenge to the system ultimately emerges
Lectures on nonperturbative canonical gravity by
Abhay Ashtekar(
Book
)
18 editions published between 1991 and 1998 in English and held by 224 WorldCat member libraries worldwide
3 Self dual actionReferences; 5 FROM TRIADS TO SU(2) SPINORS: A QUICK TRANSITION; 6 HAMILTONIAN FORMULATION; 1 Introduction; 2 Kinematical arena; 3 Extended phase space; References; 7 CONSTRAINT ALGEBRA, HAMILTONIANS AND DYNAMICS; 1 Introduction; 2 Constraint algebra; 3 Dynamics and Hamiltonians; 4 Discussion; References; 8 REALITY CONDITIONS; 1 Introduction; 2 Polynomial form; References; INCLUSION OF MATTER; 1 Introduction; 2 Self dual action and reality of equations; 3 EulerLagrange equations; 4 (3+1)decomposition; 5 Constraint algebra; 6 Hamiltonians and reality conditions
18 editions published between 1991 and 1998 in English and held by 224 WorldCat member libraries worldwide
3 Self dual actionReferences; 5 FROM TRIADS TO SU(2) SPINORS: A QUICK TRANSITION; 6 HAMILTONIAN FORMULATION; 1 Introduction; 2 Kinematical arena; 3 Extended phase space; References; 7 CONSTRAINT ALGEBRA, HAMILTONIANS AND DYNAMICS; 1 Introduction; 2 Constraint algebra; 3 Dynamics and Hamiltonians; 4 Discussion; References; 8 REALITY CONDITIONS; 1 Introduction; 2 Polynomial form; References; INCLUSION OF MATTER; 1 Introduction; 2 Self dual action and reality of equations; 3 EulerLagrange equations; 4 (3+1)decomposition; 5 Constraint algebra; 6 Hamiltonians and reality conditions
Conceptual problems of quantum gravity : based on the proceedings of the 1988 Osgood Hill Conference, North Andover, Massachusetts,
1519 May 1988 by Osgood Hill Conference(
Book
)
10 editions published in 1991 in English and held by 223 WorldCat member libraries worldwide
10 editions published in 1991 in English and held by 223 WorldCat member libraries worldwide
New perspectives in canonical gravity by
Abhay Ashtekar(
Book
)
4 editions published in 1988 in English and Undetermined and held by 91 WorldCat member libraries worldwide
4 editions published in 1988 in English and Undetermined and held by 91 WorldCat member libraries worldwide
Asymptotic quantization : based on 1984 Naples lectures by
Abhay Ashtekar(
Book
)
6 editions published in 1987 in English and held by 70 WorldCat member libraries worldwide
6 editions published in 1987 in English and held by 70 WorldCat member libraries worldwide
Loop quantum gravity : the first 30 years by
Abhay Ashtekar(
)
8 editions published between 2016 and 2017 in English and held by 64 WorldCat member libraries worldwide
"Over the last decade, several important advances have occurred, that include the continuum and classical limit of the nonperturbative theory on the conceptual side, and concrete ideas on confronting quantum gravity with observations in cosmology. This volume takes the reader from basics to recent advances, thereby bridging an important gap. It presents a snapshot of the stateoftheart in loop quantum gravity from the perspective of young leading researchers. The goal is twofold: to provide a contemporary introduction to the entire field for students and postdocs and, an overview of the current status for more senior researchers. These overviews present the latest developments that are not discussed in existing books, particularly the applications to the cosmology of the early universe and quantum aspects of black holes"
8 editions published between 2016 and 2017 in English and held by 64 WorldCat member libraries worldwide
"Over the last decade, several important advances have occurred, that include the continuum and classical limit of the nonperturbative theory on the conceptual side, and concrete ideas on confronting quantum gravity with observations in cosmology. This volume takes the reader from basics to recent advances, thereby bridging an important gap. It presents a snapshot of the stateoftheart in loop quantum gravity from the perspective of young leading researchers. The goal is twofold: to provide a contemporary introduction to the entire field for students and postdocs and, an overview of the current status for more senior researchers. These overviews present the latest developments that are not discussed in existing books, particularly the applications to the cosmology of the early universe and quantum aspects of black holes"
Loops, knots, gauge theories, and quantum gravity by
Rodolfo Gambini(
)
3 editions published between 1996 and 2009 in English and held by 32 WorldCat member libraries worldwide
"This text provides a selfcontained introduction to applications of loop representations and knot theory in particle physics and quantum gravity." "Loop representations (and the related topic of knot theory) are of considerable current interest because they provide a unified arena for the study of the gauge invariant quantization of YangMills theories and gravity, and suggest a promising approach to the eventual unification of the four fundamental forces. This text begins with a review of calculus in loop space and the fundamentals of loop representations. It then goes on to describe loop representations in Maxwell theory, YangMills theories as well as lattice techniques. Applications in quantum gravity are then discussed in detail. Following chapters move on to consider knot theory, the braid algebra and extended loop representations in quantum gravity. A final chapter assesses the current status of the theory and points out possible directions for future research." "This selfcontained introduction will be of interest to graduate students and researchers in theoretical physics and applied mathematics."Jacket
3 editions published between 1996 and 2009 in English and held by 32 WorldCat member libraries worldwide
"This text provides a selfcontained introduction to applications of loop representations and knot theory in particle physics and quantum gravity." "Loop representations (and the related topic of knot theory) are of considerable current interest because they provide a unified arena for the study of the gauge invariant quantization of YangMills theories and gravity, and suggest a promising approach to the eventual unification of the four fundamental forces. This text begins with a review of calculus in loop space and the fundamentals of loop representations. It then goes on to describe loop representations in Maxwell theory, YangMills theories as well as lattice techniques. Applications in quantum gravity are then discussed in detail. Following chapters move on to consider knot theory, the braid algebra and extended loop representations in quantum gravity. A final chapter assesses the current status of the theory and points out possible directions for future research." "This selfcontained introduction will be of interest to graduate students and researchers in theoretical physics and applied mathematics."Jacket
On manifolds with an affine connection and the theory of general relativity by
Elie Cartan(
Book
)
1 edition published in 1986 in English and held by 5 WorldCat member libraries worldwide
1 edition published in 1986 in English and held by 5 WorldCat member libraries worldwide
Rayonnement gravitationnel by
Tsvi Piran(
Book
)
1 edition published in 1983 in French and held by 4 WorldCat member libraries worldwide
1 edition published in 1983 in French and held by 4 WorldCat member libraries worldwide
New perspectives in canonical gravity by
Abhay Ashtekar(
Book
)
1 edition published in 1988 in Undetermined and held by 4 WorldCat member libraries worldwide
1 edition published in 1988 in Undetermined and held by 4 WorldCat member libraries worldwide
New perspectives in canonical gravity by
Abhay Ashtekar(
Book
)
1 edition published in 1988 in English and held by 4 WorldCat member libraries worldwide
1 edition published in 1988 in English and held by 4 WorldCat member libraries worldwide
Loop gravity : an application and an extension by Victor Manuel Taveras(
)
1 edition published in 2009 in English and held by 3 WorldCat member libraries worldwide
In this thesis we address two issues in the area of loop quantum gravity. The first concerns the semiclassical limit in loop quantum cosmology via the use of socalled effective equations. In loop quantum cosmology the quantum dynamics is well understood. We can approximate the full quantum dynamics in the infinite dimensional Hilbert space by projecting it on a finite dimensional submanifold thereof, spanned by suitably chosen semiclassical states. This submanifold is isomorphic with the classical phase space and the projected dynamical flow provides effective equations incorporating the leading quantum corrections to the classical equations of motion. Numerical work has been done in the full theory using quantum states which are semiclassical at late times. These states follow the classical trajectory until the density is on the order of 1\% of the Planck density then deviate strongly from the classical trajectory. The effective equations we obtain reproduce this behavior to surprising accuracy. The second issue concerns generalizations of the classical action which is the starting point for loop quantum gravity. In loop quantum gravity one begins with the EinsteinHilbert action, modified by the addition of the socalled Holst term. Classically, this term does not affect the equations of motion, but it leads to a wellknown quantization ambiguity in the quantum theory parametrized by the BarberoImmirzi parameter, which rescales the eigenvalues of the area and volume operators. We consider the theory obtained by promoting the BarberoImmirzi parameter to a field. The resulting theory, called Modified Holst Gravity, is equivalent to General Relativity coupled to a pseudoscalar field. However, this theory turns out to have an unconventional kinetic term for the BarberoImmirzi field and a rather unnatural coupling with fermions. We then propose a further generalization of the Holst action, which we call Modified NiehYan Gravity, which yields a theory of gravity and matter with a more natural coupling to the BarberoImmirzi field. We conclude by commenting on possible implications for cosmology, induced by the existence of this new pseudoscalar field
1 edition published in 2009 in English and held by 3 WorldCat member libraries worldwide
In this thesis we address two issues in the area of loop quantum gravity. The first concerns the semiclassical limit in loop quantum cosmology via the use of socalled effective equations. In loop quantum cosmology the quantum dynamics is well understood. We can approximate the full quantum dynamics in the infinite dimensional Hilbert space by projecting it on a finite dimensional submanifold thereof, spanned by suitably chosen semiclassical states. This submanifold is isomorphic with the classical phase space and the projected dynamical flow provides effective equations incorporating the leading quantum corrections to the classical equations of motion. Numerical work has been done in the full theory using quantum states which are semiclassical at late times. These states follow the classical trajectory until the density is on the order of 1\% of the Planck density then deviate strongly from the classical trajectory. The effective equations we obtain reproduce this behavior to surprising accuracy. The second issue concerns generalizations of the classical action which is the starting point for loop quantum gravity. In loop quantum gravity one begins with the EinsteinHilbert action, modified by the addition of the socalled Holst term. Classically, this term does not affect the equations of motion, but it leads to a wellknown quantization ambiguity in the quantum theory parametrized by the BarberoImmirzi parameter, which rescales the eigenvalues of the area and volume operators. We consider the theory obtained by promoting the BarberoImmirzi parameter to a field. The resulting theory, called Modified Holst Gravity, is equivalent to General Relativity coupled to a pseudoscalar field. However, this theory turns out to have an unconventional kinetic term for the BarberoImmirzi field and a rather unnatural coupling with fermions. We then propose a further generalization of the Holst action, which we call Modified NiehYan Gravity, which yields a theory of gravity and matter with a more natural coupling to the BarberoImmirzi field. We conclude by commenting on possible implications for cosmology, induced by the existence of this new pseudoscalar field
A new Hamiltonian formulation of general relativity by
Abhay Ashtekar(
Book
)
1 edition published in 1986 in English and held by 3 WorldCat member libraries worldwide
1 edition published in 1986 in English and held by 3 WorldCat member libraries worldwide
Null infinity and killing fields by
Abhay Ashtekar(
Book
)
1 edition published in 1979 in German and held by 2 WorldCat member libraries worldwide
1 edition published in 1979 in German and held by 2 WorldCat member libraries worldwide
Microstructure of spacetime in quantrum [quantum] gravity by
Abhay Ashtekar(
Book
)
1 edition published in 1987 in English and held by 2 WorldCat member libraries worldwide
1 edition published in 1987 in English and held by 2 WorldCat member libraries worldwide
Null infinity and Killing fields by
Abhay Ashtekar(
Book
)
1 edition published in 1979 in English and held by 2 WorldCat member libraries worldwide
1 edition published in 1979 in English and held by 2 WorldCat member libraries worldwide
Road to reality with Roger Penrose by
Paolo Aniello(
Book
)
1 edition published in 2015 in English and held by 2 WorldCat member libraries worldwide
1.3.3 Mixed states entanglement and invariant operator valuedtensor fields1.4 From quantum to classical information; 1.5 Conclusions and outlook; Chapter 2. Black holes in general relativity; 2.1 Introduction; 2.1.1 Newtonian considerations; 2.1.2 General relativity; 2.2 Black holes in general relativity; 2.2.1 Early history; 2.2.2 Uniqueness; 2.3 Event horizons and their unforeseen properties; 2.3.1 Event horizons; 2.3.2 An unexpected treasure trove; 2.4 Epilogue; 2.4.1 Spookiness of event horizons; 2.4.2 Quasilocal horizons
1 edition published in 2015 in English and held by 2 WorldCat member libraries worldwide
1.3.3 Mixed states entanglement and invariant operator valuedtensor fields1.4 From quantum to classical information; 1.5 Conclusions and outlook; Chapter 2. Black holes in general relativity; 2.1 Introduction; 2.1.1 Newtonian considerations; 2.1.2 General relativity; 2.2 Black holes in general relativity; 2.2.1 Early history; 2.2.2 Uniqueness; 2.3 Event horizons and their unforeseen properties; 2.3.1 Event horizons; 2.3.2 An unexpected treasure trove; 2.4 Epilogue; 2.4.1 Spookiness of event horizons; 2.4.2 Quasilocal horizons
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Related Identities
 Stachel, John J. 1928 Other Honoree Editor
 Petkov, Vesselin 1949 Editor
 Divarci, Lindy Editor
 Renn, Jürgen 1956 Author Editor
 Isenberg, James A. Editor
 Schröter, Petra Editor
 Berger, B. (Beverly) Editor
 MacCallum, M. A. H. Editor
 Tate, Ranjeet S. Other
 Boston University Center for Einstein Studies
Useful Links
Associated Subjects
Administrative agencies Astronomy Astrophysics Awards Canada College administrators College teachers Connections (Mathematics) Educational assistance Executives Field theory (Physics) Gauge fields (Physics) General relativity (Physics) Gravitation Gravitational waves Group theory Investigations Knot theory Lecturers Loops (Group theory) Manifolds (Mathematics) Mathematical physics Mathematical physicsAsymptotic theory Penrose, Roger Physics Quantum cosmology Quantum field theory Quantum gravity Quantum gravityMathematics Quantum theory Realism Relativity (Physics) Research SciencePhilosophy Scientists Space and time United States
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Alternative Names
Abhay Ashtekar
Abhay Ashtekar Amerikaans natuurkundige
Abhay Ashtekar fisico indiano
Abhay Ashtekar físico indio
Abhay Ashtekar Indian physicist
Abhay Ashtekar physicien indien
Abhay Vasant Ashtekar
Abhay Vasant Ashtekar USamerikanischer theoretischer Physiker
Ashtekar, Abhay, 1949
Ashtekar, Abhay Vasant 1949
Vasant Ashtekar, Abhay 1949
Абэй Аштекар
ابهی اشتکار
ابهی اشتکار فیزیکدان آمریکایی
अभय अष्टेकर
అభయ్ అష్టెకర్
ಅಭಯ್ ಅಷ್ಟೇಕರ್
阿貝·阿希提卡
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