Primordial Nucleosynthesis And Evolution Of Early Universe

Author: Katsuhiko Sato
Publisher: Springer Science & Business Media
ISBN: 9401134103
Size: 70.69 MB
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Primordial Nucleosynthesis And Evolution Of Early Universe from the Author: Katsuhiko Sato. The International Conference "Primordial Nucleosynthesis and Evolution of Early Universe" was held in the presence of Prof. William Fowler on 4 - 8 September 1990 at the Sanjo Conference Hall, the University of Tokyo. This conference was co-sponsored by IUPAP, the International Union of Pure and Applied Physics, and by the University of Tokyo. The number of participants was 156, 58 from 15 foreign countries and 98 from Japan. About 120 contributions were submitted orally or as posters. Originally this conference was planned as a small gathering on Primordial Nucleosynthesis as indicated in the title, since primordial nucleosynthesis is the most important probe of the early stage of the universe. As is well known, light element abundances strongly depend on the time evolution of temperature and density. In this sense we can say that primordial nucleosynthesis is both the thermometer and speedometer of the early universe. Moreover, recently it has been claimed that primordial nucleosynthesis is an indicator of inhomogeneity of the early universe too. Now research of the primordial nucleosynthesis is in a boom. We, however, decided to include observational cosmology, of observations. taking into account the recent remarkable results Nowadays, to reveal the large scale structure of the universe and discover its origin is a main subject in cosmology. We invited distinguished scientists from all over the world, and very fortunately almost all these people accepted to attend this conference.

Inhomogeneous Primordial Nucleosynthesis And New Abundance Constraints On Omega Sub B H Sup 2

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Inhomogeneous Primordial Nucleosynthesis And New Abundance Constraints On Omega Sub B H Sup 2 from the Author: . We discuss the upper limit to the baryonic contribution to the closure density. We consider effects of new observational and theoretical uncertainties in the primordial light element abundances, and the effects of fluctuation geometry on the inhomogeneous nucleosynthesis yields. We also consider implications of the possible detection of a high D/H abundance in a Lyman-[alpha] absorption cloud at high redshift and the implied chemical evolution effects of a high deuterium abundance. We show that there exists a region of the parameter space for inhomogeneous models in which a somewhat higher baryonic contribution to the closure density is possible than that allowed in standard homogeneous models. This result is contrary to some other recent studies and is due to both geometry and recently revised uncertainties in primordial light-element abundances, particularly[sup 7]Li. We find that the presently adopted abundance constraints are consistent with a contribution of baryons to the closure density as high as[Omega][sub b]h[sub 50][sup 2][le] 0.11 ([eta][le] 7[times] 10[sup[minus]10]). This corresponds to a 20% increase over the limit from standard homogeneous models ([Omega][sub b]h[sub 50][sup 2][le] 0.08, [eta][le] 5.8[times] 10[sup[minus]10]). With a high deuterium abundance the upper limits for the inhomogeneous and homogeneous models would be[Omega][sub b]h[sub 50][sup 2][le] 0.04 and 0.03 ([eta][le] 2.6[times] 10[sup[minus]10] and 1.9[times] 10[sup[minus]10]), respectively. Even higher limits could be obtained by further relaxing the presently accepted primordial lithium abundance constraint as some have proposed.

The Big Bang And Other Explosions In Nuclear And Particle Astrophysics

Author: David N. Schramm
Publisher: World Scientific
ISBN: 9789810220242
Size: 30.90 MB
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The Big Bang And Other Explosions In Nuclear And Particle Astrophysics from the Author: David N. Schramm. This volume of important papers by one the world's leading astrophysicists provides a sweeping survey of the incisive and exciting applications of nuclear and particle physics to a wide range of problems in astrophysics and cosmology.The prime focus of the book is on Big Bang cosmology and the role of primordial nucleosynthesis in establishing the modern consensus on the Big Bang. This leads into the connection of cosmology to particle physics and the constraints put on various elementary particles by astrophysical arguments. Big Bang Nucleosynthesis has also led to the argument for nonbaryonic dark matter and is thus related to the major problem in physical cosmology today, namely, structure formation. The nuclear-particle interface with astrophysics also extends to the other topics of major interest such as the age of the universe, cosmic rays, supernovae, and solar neutrinos, each of which will be discussed in some detail. Each section contains historical papers, current papers, and frequently a popular article on the subject which provides an overview of the topic.This volume is testimony to the success of the integration of nuclear and particle physics with astrophysics and cosmology, and to the ingenuity of the work in this area which has earned the author numerous prestigious awards. The book, which is accessible to beginning graduate students, should be of particular interest to researchers and students in astronomy, astrophysics, cosmology and gravitation, and also in high energy and nuclear physics.

The Early Universe

Author: Edward Kolb
Publisher: CRC Press
ISBN: 0429972490
Size: 25.92 MB
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The Early Universe from the Author: Edward Kolb. The Early Universe has become the standard reference on forefront topics in cosmology, particularly to the early history of the Universe. Subjects covered include primordial nubleosynthesis, baryogenesis, phases transitions, inflation, dark matter, and galaxy formation, relics such as axions, neutrinos and monopoles, and speculations about the Universe at the Planck time. The book includes more than ninety figures as well as a five-page update discussing recent developments such as the COBE results.

Particle Physics And Cosmology Dark Matter

Author: M. Srednicki
Publisher: Elsevier
ISBN: 0444596097
Size: 12.80 MB
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Particle Physics And Cosmology Dark Matter from the Author: M. Srednicki. At least eighty percent of the mass of the universe consists of some material which, unlike ordinary matter, neither emits nor absorbs light. This book collects key papers related to the discovery of this astonishing fact and its profound implications for astrophysics, cosmology, and the physics of elementary particles. The book focuses on the likely possibility that the dark matter is composed of an as yet undiscovered elementary particle, and examines the boundaries of our present knowledge of the properties such a particle must possess.

The Impact Of Very High S N Spectroscopy On Stellar Physics

Author: International Astronomical Union. Symposium
Publisher: Springer Science & Business Media
ISBN: 9789027726957
Size: 60.12 MB
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The Impact Of Very High S N Spectroscopy On Stellar Physics from the Author: International Astronomical Union. Symposium. Proceedings of the 132nd Symposium of the International Astronomical Union, held in Paris, France, June 29-July 3, 1987

Inflationary Cosmology

Author: L. F. Abbott
Publisher: World Scientific
ISBN: 9789971978648
Size: 38.37 MB
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Inflationary Cosmology from the Author: L. F. Abbott. Inflation has revolutionized cosmology primarily because it has eliminated the dependence of cosmological modelling on initial conditions. Thus inflationary cosmology is able to account for the present universe starting from a wide range of initial conditions. This volume reviews the presents state of subject. Each chapter consists of a brief introduction followed by reprints of important papers. Experts in the field are also provided with a unifying view point.

Gravitational Lenses

Author: P. Schneider
Publisher: Springer Science & Business Media
ISBN: 9783540665069
Size: 33.95 MB
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Gravitational Lenses from the Author: P. Schneider. This monograph describes comprehensively and in sufficient detail both the theory and observation of gravitational lensing, an effect that is of growing importance for astronomical observations and cosmological modelling. This book is the first monograph (outside the USSR) on this topic.