Results 131 to 140 of about 881 (177)
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2022
Abstract Chapter 24 introduces the field of cosmology. It starts by considering Olber’s paradox and then constructs a simple Newtonian cosmology model. It then discusses the cosmological principle and Weyl’s postulate as assumptions that go into formulating relativistic cosmology.
Ray d’Inverno, James Vickers
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Abstract Chapter 24 introduces the field of cosmology. It starts by considering Olber’s paradox and then constructs a simple Newtonian cosmology model. It then discusses the cosmological principle and Weyl’s postulate as assumptions that go into formulating relativistic cosmology.
Ray d’Inverno, James Vickers
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PROBLEMS OF RELATIVISTIC COSMOLOGY
Soviet Physics Uspekhi, 1963CONTENTS I. Features of cosmological solutions of the gravitational equations 495 1. Introduction 495 2. General solution with fictitious singularity 496 3. Anisotropic solution with singularity 500 4. Quasi-isotropic solution 504 5. General conclusions concerning singularities of cosmological solutions 505 II.
E.M. Lifshitz, Isaak M. Khalatnikov
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2012
Cosmology has been transformed by dramatic progress in high-precision observations and theoretical modelling. This book surveys key developments and open issues for graduate students and researchers. Using a relativistic geometric approach, it focuses on the general concepts and relations that underpin the standard model of the Universe.
Ellis, George F. R. +2 more
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Cosmology has been transformed by dramatic progress in high-precision observations and theoretical modelling. This book surveys key developments and open issues for graduate students and researchers. Using a relativistic geometric approach, it focuses on the general concepts and relations that underpin the standard model of the Universe.
Ellis, George F. R. +2 more
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Cosmological perturbations of a relativistic condensate
Physical Review D, 1995Based on a model of the early Universe with a relativistic Bose-Einstein condensate as the source of inflationary expansion, we calculate the gauge-invariant measure of the cosmological density perturbations caused by the zero-point fluctuations and excitations of the condensate.
, Parker, , Zhang
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Physics Today, 1967
SOME OF THE MOST exciting recent developments in physics have been in the realms of the very small and the very large. Chief among the latter was the discovery of “quasars,” which has quadrupled our depth penetration of the universe (if quasars are where most astronomers think they are), and which has also stimulated the possibly irrelevant but ...
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SOME OF THE MOST exciting recent developments in physics have been in the realms of the very small and the very large. Chief among the latter was the discovery of “quasars,” which has quadrupled our depth penetration of the universe (if quasars are where most astronomers think they are), and which has also stimulated the possibly irrelevant but ...
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1992
Abstract Cosmology is the study of the dynamical structure of the universe as a whole. As in most modelling exercises, we shall start by trying to find a very simple model of the universe. This is done by smoothing out all the irregularities in space and in time and concentrating simply on the gross features of the universe. So, to start
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Abstract Cosmology is the study of the dynamical structure of the universe as a whole. As in most modelling exercises, we shall start by trying to find a very simple model of the universe. This is done by smoothing out all the irregularities in space and in time and concentrating simply on the gross features of the universe. So, to start
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Some Relativistic Cosmological Models
General Relativity and Gravitation, 1998The author's dissertation from 1966 is published here for the first time in a journal. The now famous ``Kantowski-Sachs models'' in cosmology were deduced under the supervisorship of R. Sachs. The commutation relations and Killing equations then require the metric to have the following form \[ ds^2= dt^2- X(t)^2 dr^2- Y(t)^2 g_{AB} dx^A dx^B \qquad (A ...
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Relativistic kinetics and cosmology. I
Soviet Physics Journal, 1980A study is made of the problem of describing the cosmological expansion of a plasma in the framework of Chernikov's relativistic kinetic theory. It is shown that from the point of view of relativistic kinetics there are two stages in the evolution of the Universe in which thermodynamic equilibrium of the plasma is attained asymptotically: 1) the ...
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Republication of: Relativistic cosmology
General Relativity and Gravitation, 2009This is a republication of a paper by G.F.R. Ellis first published in Proceedings of the International School of Physics: General Relativity and Cosmology, 1971, in which he formulated the framework for relativistic cosmology with an arbitrary background geometry.
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