Big Bang Nucleosynthesis Revisited
DOWNLOAD
Download Big Bang Nucleosynthesis Revisited PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Big Bang Nucleosynthesis Revisited book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Big Bang Nucleosynthesis Revisited
DOWNLOAD
Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-08-16
Big Bang Nucleosynthesis Revisited written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-08-16 with categories.
The homogeneous big-bang nucleosynthesis yields of D, He-3, He-4, and Li-7 are computed taking into account recent measurements of the neutron mean-life as well as updates of several nuclear reaction rates which primarily affect the production of Li-7. The extraction of primordial abundances from observation and the likelihood that the primordial mass fraction of He-4, Y(sub p) is less than or equal to 0.24 are discussed. Using the primordial abundances of D + He-3 and Li-7 we limit the baryon-to-photon ratio (eta in units of 10 exp -10) 2.6 less than or equal to eta(sub 10) less than or equal to 4.3; which we use to argue that baryons contribute between 0.02 and 0.11 to the critical energy density of the universe. An upper limit to Y(sub p) of 0.24 constrains the number of light neutrinos to N(sub nu) less than or equal to 3.4, in excellent agreement with the LEP and SLC collider results. We turn this argument around to show that the collider limit of 3 neutrino species can be used to bound the primordial abundance of He-4: 0.235 less than or equal to Y(sub p) less than or equal to 0.245. Olive, Keith A. and Schramm, David N. and Steigman, Gary and Walker, Terry P. Unspecified Center NASA-CR-186256, NAS 1.26:186256, FERMILAB-PUB-89/262-A, CFA-89-2985, UMN-TH-816/89 NASG-931; DE-AC02-83ER-40105; DE-AC02-76ER-01545; NSF AST-88-20595; NAGW-1321; NAGW-1340...
Neutrino Degeneracy And Cosmological Nucleosynthesis Revisited
DOWNLOAD
Author : National Aeronautics and Space Adm Nasa
language : en
Publisher: Independently Published
Release Date : 2019
Neutrino Degeneracy And Cosmological Nucleosynthesis Revisited written by National Aeronautics and Space Adm Nasa and has been published by Independently Published this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
A reexamination of the effects of non-zero degeneracies on Big Bang Nucleosynthesis is made. As previously noted, non-trivial alterations of the standard model conclusions can be induced only if excess lepton numbers L sub i, comparable to photon number densities eta sub tau, are assumed (where eta sub tau is approx. 3 times 10(exp 9) eta sub b). Furthermore, the required lepton number densities (L sub i eta sub tau) must be different for upsilon sub e than for upsilon sub mu and epsilon sub tau. It is shown that this loophole in the standard model of nucleosynthesis is robust and will not vanish as abundance and reaction rate determinations improve. However, it is also argued that theoretically (L sub e) approx. (L sub mu) approx. (L sub tau) approx. eta sub b is much less than eta sub tau which would preclude this loophole in standard unified models. Olive, K. A. and Schramm, David N. and Thomas, D. and Walker, T. P. NASA-CR-188703, NAS 1.26:188703, FERMILAB-PUB-91/192-A NAGW-1340...
From The Big Bang To The Nucleosynthesis
DOWNLOAD
Author : A. Bracco
language : en
Publisher: IOS Press
Release Date : 2011
From The Big Bang To The Nucleosynthesis written by A. Bracco and has been published by IOS Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Science categories.
Physicists have devoted much effort to reproducing the conditions of the primordial universe in laboratory conditions in their quest to work out a comprehensive theory of the appearance and evolution of nuclear matter. Whether it be trying to recreate the predicted primordial state of high-energy density matter in which quarks and gluons are effectively deconfined - the so-called Quark Gluon Plasma (QGP) - or exploring the structure and reaction properties of very unstable nuclei in experiments using radioactive beams, they have striven to understand the events which characterized the Big Bang and the various nucleosynthesis mechanisms which occur in the stars. This book contains the proceedings of the 2010 Enrico Fermi summer school held in Varenna, Italy, in July 2010, and devoted to the present understanding of the primordial universe and the origin of the elements, as achieved by studying nuclei and their constituents in extreme regimes of energy and composition. Subjects covered include: QGP formation; exotic nuclei, their degrees of freedom from the ground state and the properties of the excited states; the complex, but appealing theory describing the supernovae explosion and neutron stars; dark energy and matter; Big Bang nucleosynthesis and energy and solar neutrino production; nuclear cosmochronology; beta and gamma decay relevant for the nucleosynthesis of heavy nuclei. The annual Enrico Fermi summer school is internationally renowned and this book will be of great interest to all those involved in the field of nuclear physics.
Big Bang Nucleosynthesis And The Baryon Density Of The Universe
DOWNLOAD
Author : Craig J. Copi
language : en
Publisher:
Release Date : 1995
Big Bang Nucleosynthesis And The Baryon Density Of The Universe written by Craig J. Copi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Big bang theory categories.
Big Bang Nucleosynthesis
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1987
Big Bang Nucleosynthesis written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with categories.
The first collider tests of cosmological theory are now underway. The number of neutrino families in nature, N/sub nu/, plays a key role in elementary particle physics as well as in the synthesis of the light elements during the early evolution of the Universe. Standard Big Bang Nucleosynthesis argues for N/sub nu/ = 3 +- 1. Current limits on N/sub nu/ from the CERN anti pp collider and ee− colliders are presented and compared to the cosmological bound. Supernova SN 1987A is also shown to give a limit on N/sub nu/ comparable to current accelerator bounds. All numbers are found to be small thus verifying the Big Bang model at an earlier epoch than is possible by traditional astronomical observations. Future measurements at SLC and LEP will further tighten this argument. Another key prediction of the standard Big Bang Nucleosynthesis is that the baryon density must be small (.cap omega./sub B/ less than or equal to 0.1). Recent attempts to try to subvert this argument using homogeneities of various types are shown to run afoul of the 7Li abundance which has now become a rather firm constraint. 18 refs., 2 figs.
Primordial Nucleosynthesis
DOWNLOAD
Author : B W Carney
language : en
Publisher: World Scientific
Release Date : 1990-02-01
Primordial Nucleosynthesis written by B W Carney and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990-02-01 with categories.
This workshop was one of the first meetings where cosmologists, astronomers, astrophysicists, and nuclear physicists discussed research areas of mutual interest. Very new results on inhomogeneous models and neutron-proton segregation were presented, and related to primordial abundances. The current rapid progress in measuring nuclear reaction rates for radioactive nuclei was summarized, together with prospects for developing relevant facilities for nuclear astrophysics and low-energy nuclear physics.
Big Bang Nucleosynthesis
DOWNLOAD
Author : Masa-aki Hashimoto
language : en
Publisher: Springer
Release Date : 2018-11-27
Big Bang Nucleosynthesis written by Masa-aki Hashimoto and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-11-27 with Science categories.
The book reviews theories of nucleosynthesis in big-bang cosmology. It introduces the standard model of cosmology, astronuclear reactions, numerical techniques for nucleosynethsis, and describes in detail the theories that go beyond the standard models, enabling readers to grasp the physics of big-bang nucleosynthesis on the basis of cosmology, general relativity and nuclear physics. In addition, the authors provide insights into the theoretical constrains required by observations. As a consequence, readers find out that big-bang nucleosynthesis still has windows opened to another cosmology. Although the book focuses on highly advanced topics, it is concisely written and mathematical derivations are explained step-by-step, making it accessible to graduate readers. Thus it is a short monograph appealing to a variety of readers interested in nucleosynthesis of big-bang cosmology.
Standard Deviations
DOWNLOAD
Author : S. P. Riley
language : en
Publisher:
Release Date : 1989*
Standard Deviations written by S. P. Riley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989* with Nucleosynthesis categories.
The Synthesis Of The Elements
DOWNLOAD
Author : Giora Shaviv
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-04-13
The Synthesis Of The Elements written by Giora Shaviv and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-04-13 with Science categories.
This book describes the origins and evolution of the chemical elements we and the cosmos are made of. The story starts with the discovery of the common elements on Earth and their subsequent discovery in space. How do we learn the composition of the distant stars? How did progress in quantum theory, nuclear physics, spectroscopy, stellar structure and evolution, together with observations of stars, converge to provide an incredibly detailed picture of the universe? How does research in the micro-world explain the macro-world? How does progress in one affect the other, or lack of knowledge in one inhibit progress in the other? In short, Shaviv describes how we discovered the various pieces of the jigsaw that form our present picture of the universe; and how we sometimes put these in the wrong place before finding in the right one. En route we meet some fascinating personalities and learn about heated controversies. Shaviv shows how science lurched from one dogma to the next, time and again shattering much of what had been considered solid knowledge, until eventually a stable understanding arose. Beginning with generally accepted science, the book ends in today’s terra incognita of nuclear physics, astrophysics and cosmology. A monumental work that will fascinate scientists, philosophers, historians and lay readers alike.
Cosmology And The Early Universe
DOWNLOAD
Author : Pasquale Di Bari
language : en
Publisher: CRC Press
Release Date : 2018-09-03
Cosmology And The Early Universe written by Pasquale Di Bari and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-09-03 with Science categories.
This book discusses cosmology from both an observational and a strong theoretical perspective. The first part focuses on gravitation, notably the expansion of the universe and determination of cosmological parameters, before moving onto the main emphasis of the book, the physics of the early universe, and the connections between cosmological models and particle physics. The book provides links with particle physics and with investigations of the theories beyond the Standard Model, especially in connection to dark matter and matter-antimatter asymmetry puzzles. Readers will gain a comprehensive account of cosmology and the latest observational results, without requiring prior knowledge of relativistic theories, making the text ideal for students. Features: Provides a self-contained discussion of modern cosmology results without requiring any prior knowledge of relativistic theories, enabling students to learn the first rudiments needed for a rigorous comprehension of cosmological concepts Contains a timely discussion of the latest cosmological results, including those from WMAP and the Planck satellite, and discuss the cosmological applications of the Nobel Prize 2017 awarded discovery of gravitational waves by the LIGO interferometer and the very high energy neutrinos discovered by the IceCube detector Includes original figures complementing mathematical derivations and accounting for the most important cosmological observations, in addition to a wide variety of problems with a full set of solutions discussed in detail in an accompanying solutions manual (available upon qualifying course adoption) To view the errata please visit the authors personal webpage.