Astrophysics (astro-ph)
, Cosmology at the Millennium (1999)
abstract: ... seen today. A paradigm based upon deep connections between cosmology and elementary particle physics -- inflation + cold dark ma ... of the forces and particles of nature. As we enter the 21st century, a flood of observations is testing this paradigm.
http://arxiv.org/abs/astro-ph/9901113
Michael S. Turner (U. Chicago/Fermilab), J. Anthony Tyson (Lucent)
(Submitted on 11 Jan 1999)
One hundred years ago we did not know how stars generate energy, the age of the Universe was thought to be only millions of years, and our Milky Way galaxy was the only galaxy known. Today, we know that we live in an evolving and expanding Universe comprising billions of galaxies, all held together by dark matter. With the hot big-bang model, we can trace the evolution of the Universe from the hot soup of quarks and leptons that existed a fraction of a second after the beginning to the formation of galaxies a few billion years later, and finally to the Universe we see today 13 billion years after the big bang, with its clusters of galaxies, superclusters, voids, and great walls. The attractive force of gravity acting on tiny primeval inhomogeneities in the distribution of matter gave rise to all the structure seen today. A paradigm based upon deep connections between cosmology and elementary particle physics -- inflation + cold dark matter -- holds the promise of extending our understanding to an even more fundamental level and much earlier times, as well as shedding light on the unification of the forces and particles of nature. As we enter the 21st century, a flood of observations is testing this paradigm.
Top matches in this document to your query 'General Relativity and Quantum Cosmology 21st Century'44 pages LaTeX with 14 eps figures. To be published in the Centennial Volume of Reviews of Modern Physics
arXiv:astro-ph/9901113v1 11 Jan 1999 COSMOLOGY AT THE MILLENNIUM Michael S. Turner 1 ,2 and J. Anthony Tyson 3 1 Departments of ... shedding light on the unification of the forces and particles of nature. As we enter the 21st century, a flood of observations is testing this paradigm. DEDICATION This article is dedicated ... the development of our understanding of the cosmos, were advances in physics ? atomic, quantum, nuclear, gr ... abstract: ... rise to all the structure seen today. A paradigm based upon deep connections between cosmology and elementary particle physics -- inflation + cold dark matter -- holds the promise of e ... shedding light on the unification of the forces and particles of nature. As we enter the 21st century, a flood of observations is testing this paradigm.
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, Big Bang riddles and their revelations (1999)
abstract: We describe how cosmology has converged towards a beautiful model of the Universe: ... the very early Universe, revealing new physics and new cosmology just as the Universe came into being. We describe inflation ...
http://arxiv.org/abs/astro-ph/9905393
Joao Magueijo, Kim Baskerville
(Submitted on 31 May 1999)
We describe how cosmology has converged towards a beautiful model of the Universe: the Big Bang Universe. We praise this model, but show there is a dark side to it. This dark side is usually called ``the cosmological problems'': a set of coincidences and fine tuning features required for the Big Bang Universe to be possible. After reviewing these ``riddles'' we show how they have acted as windows into the very early Universe, revealing new physics and new cosmology just as the Universe came into being. We describe inflation, pre Big Bang, and varying speed of light theories. At the end of the millennium, these proposals are seen respectively as a paradigm, a tentative idea, and outright speculation.
Top matches in this document to your query 'General Relativity and Quantum Cosmology 21st Century'Review to be published in the millennium issue of Phil.Trans. of the Royal Society
... Department of Mathematical Sciences, South Road, Durham, DH1 3LE, UK. We describe how cosmology has converged towards a beautiful model of the Uni- verse: the Big Bang Universe. We ... The Big Bang riddles The Big Bang Universe is a success story. It makes use of the general theory of relativity to set up the most minimalistic model for our Universe. According to this model the embry ... abstract: We describe how cosmology has converged towards a beautiful model of the Universe: the Big Bang Universe. We praise ... they have acted as windows into the very early Universe, revealing new physics and new cosmology just as the Universe came into being. We describe inflation, pre Big Bang, and varying sp ...
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, Did time begin? Will time end? (2007)
abstract: ... philosophical but are becoming, now in the twenty-first century, central to the scientific study of cosmology. The answers, which should become clarified in the next ... ideas requires discussion of a wide range of topics in cosmology, especially the make up of the energy content of the unive ...
http://arxiv.org/abs/0704.1132
Paul H. Frampton
(Submitted on 9 Apr 2007 (v1), last revised 14 May 2007 (this version, v2))
Did time begin at a Big Bang? Will the present expansion of the universe last for a finite or infinite time? These questions sound philosophical but are becoming, now in the twenty-first century, central to the scientific study of cosmology. The answers, which should become clarified in the next decade or two, could have profound implications for how we see our own role in the universe. Since the original publication of Stephen Hawking's {\it A Brief History of Time} in 1988, the answers to these questions have progressed as a result of research by the community of active theoretical physicists including myself. To present the underlying ideas requires discussion of a wide range of topics in cosmology, especially the make up of the energy content of the universe. A brief summary of my conclusions, that of three different possibilities concerning the history and future of time, the least likely is the conventional wisdom (time began and will never end) and most likely is a cyclic model (time never begins or ends), is in the short final Chapter which could be read first. To understand the reasoning leading to my conclusions could encourage reading of my entire book. My hope in writing this, my first popular book, is that it will engender reflection about time. Many a non-scientist may already hold a philosophical opinion about whether time begins and ends. This book's aim is to present some recently discovered scientific facts which can focus the reader's consideration of the two short questions in my title.
Top matches in this document to your query 'General Relativity and Quantum Cosmology 21st Century'
... . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Chapter 7: Advantages of Cyclic Cosmology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Chapter ... time? These questions sound philosophical but are becoming, now in the twenty-first century, central to the scientific study of cosmology. The answers, which should become clarified ... abstract: ... time? These questions sound philosophical but are becoming, now in the twenty-first century, central to the scientific study of cosmology. The answers, which should become clarified in the next decade or two, could have ... To present the underlying ideas requires discussion of a wide range of topics in cosmology, especially the make up of the energy content of the universe. A brief summary of my conc ...
Comments: 63 pages latex. Pagination corrected for line tightening. Typos
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0704.1132v2 [astro-ph]
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, Coordinate-free Solutions for Cosmological Superspace (1998)
abstract: Hamilton-Jacobi theory for general relativity provides an elegant covariant formulation of the ... principle. This formalism may be applied to problems in cosmology.
http://arxiv.org/abs/astro-ph/9801161
D. S. Salopek
(Submitted on 16 Jan 1998)
Hamilton-Jacobi theory for general relativity provides an elegant covariant formulation of the gravitational field. A general `coordinate-free' method of integrating the functional Hamilton-Jacobi equation for gravity and matter is described. This series approximation method represents a large generalization of the spatial gradient expansion that had been employed earlier. Additional solutions may be constructed using a nonlinear superposition principle. This formalism may be applied to problems in cosmology.
Top matches in this document to your query 'General Relativity and Quantum Cosmology 21st Century'
... British Columbia, Vancouver, Canada V6T 1Z1 (March 5, 1997) Hamilton-Jacobi theory for general relativity provides an elegant covariant formulation of the gravitational field. A general ... using a nonlinear superposition principle. This formalism may be applied to problems in cosmology. I. INTRODUCTION General relativity was formulated to describe the gravitational field in ... abstract: Hamilton-Jacobi theory for general relativity provides an elegant covariant formulation of the gravitational field. A general ... using a nonlinear superposition principle. This formalism may be applied to problems in cosmology.
Comments: 11 pages, self-unpacking, uuencoded tex file, to be published in Physical Review D (1997)
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Subjects: Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th)Journal reference: Phys.Rev. D56 (1997) 2057-2064
DOI: 10.1103/PhysRevD.56.2057
Cite as: arXiv:astro-ph/9801161v1
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Physics > History and Philosophy of Physics
, Concepts of Symmetry in the Work of Wolfgang Pauli (2008)
abstract: "Symmetry" was one of the most important methodological themes in 20th-century physics and is probably going to play no lesser role in physics of the 21st century. As used today, there are a variety of interpretations of this term, which differ in meaning as well as their ...
http://arxiv.org/abs/0802.4341
Domenico Giulini
(Submitted on 29 Feb 2008)
"Symmetry" was one of the most important methodological themes in 20th-century physics and is probably going to play no lesser role in physics of the 21st century. As used today, there are a variety of interpretations of this term, which differ in meaning as well as their mathematical consequences. Symmetries of crystals, for example, generally express a different kind of invariance than gauge symmetries, though in specific situations the distinctions may become quite subtle. I will review some of the various notions of "symmetry" and highlight some of their uses in specific examples taken from Pauli's scientific oevre.
Top matches in this document to your query 'General Relativity and Quantum Cosmology 21st Century'
... 7, 2009 Abstract "Symmetry" was one of the most important methodological themes in 20th-century physics and is probably going to play no lesser role in physics of the 21st century. As used today, there ... Science, May 20.-25. 2007, at Monte Verita, Ascona, Switzerland. 1 Contents 1 General Introduction 3 2 Remarks on the notion of symmetry 10 2.1 Spacetime . . . . . . . . . . . ... abstract: "Symmetry" was one of the most important methodological themes in 20th-century physics and is probably going to play no lesser role in physics of the 21st century. As used today, there are a variety of interpretations of this term, which differ in meaning as well as their mathematical consequences. Symmetries of crystals, for example, ...
Comments: 54 pages, 4 figures
Subjects: History and Philosophy of Physics (physics.hist-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
Cite as: arXiv:0802.4341v1 [physics.hist-ph]
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