Download or read book Ultrahigh energy Particles from Cosmic Strings written by and published by . This book was released on 1991 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: The idea of production of ultrahigh-energy particles in the present universe due to annihilation or collapse of topological defects is discussed. Topological defects, formed in symmetry-breaking phase transitions in the early universe, can survive till today owing to their topological stability. However, under certain circumstances, topological defects may be physically destroyed. When topological defects are destroyed, the energy contained in the defects can be released in the form of massive gauge- and Higgs bosons of the underlying spontaneously broken gauge theory. Subsequent decay of these massive particles can give rise to energetic particles ranging up to an energy on the order of the mass of the original particles released from the defects. This may give us a natural'' mechanism of production of extremely energetic cosmic ray particles in the universe today, without the need for any acceleration mechanism. To illustrate this idea, I describe in detail the calculation of the expected ultrahigh-energy proton spectrum due to a specific process which involves collapse or multiple self-intersections of a class of closed cosmic string loops formed in a phase transition at a grand unification energy scale. I discuss the possibility that some of the highest-energy cosmic ray particles are of this origin. By comparing with the observational results on the ultrahigh-energy cosmic rays, we derive an upper limit to the average fraction of the total energy in all primary'' cosmic string loops that may be released in the form of particles due to collapse or multiple self-intersections of these loops. No nuclei such as [alpha]'s or Fe's are in the spectrum. 43 refs., 3 figs.
Download or read book Physics and Astrophysics of Ultra High Energy Cosmic Rays written by M. Lemoine and published by Springer. This book was released on 2008-01-11 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International School on Physics and Astrophysics of Ultra High Energy Cosmic Rays (UHECR2000) was held at the Observatoire de Paris–Meudon on June 26-29, 2000. This was the ?rst international school speci?cally dedicated to ultra high energy cosmic rays. Its aim was to familiarize with and attract students, physicists and astronomers into this quickly developing newresearch ?eld. The mysterious and currently unknown origin of the most energetic par- cles observed in Nature has triggered in recent years theoretical speculations ranging from electromagnetic acceleration to as yet undiscovered physics - yond the Standard Model. It has also lead to the development of several new detection concepts and experimental projects, some of which are currently - der construction. By its nature, the ?eld of ultra high energy cosmic rays is therefore highly interdisciplinary and borrows from astrophysics and cosmology, via particle physics, to experimental physics and observational astronomy. One main aspect of the school was to emphasize and take advantage of this interd- ciplinarity. The lectures were grouped into subtopics and are reproduced in this volume in the following order: After a general introductory lecture on cosmic rays follow two contributions on experimental detection techniques, followed by three lectures on acceleration in astrophysical objects. The next four contri- tions cover all major aspects of propagation and interactions of ultra high energy radiation, including speculative issues such as newinteractions.
Download or read book The Mathematical Theory of Cosmic Strings written by M.R. Anderson and published by CRC Press. This book was released on 2015-05-06 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a comprehensive survey of the current state of knowledge about the dynamics and gravitational properties of cosmic strings treated in the idealized classical approximation as line singularities described by the Nambu-Goto action. The author's purpose is to provide a standard reference to all work that has been published since the mid-1
Download or read book Cosmic Strings and Other Topological Defects written by A. Vilenkin and published by Cambridge University Press. This book was released on 1994 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive introduction to the role of cosmic strings and other topological defects in the universe.
Download or read book Introduction To Ultrahigh Energy Cosmic Ray Physics written by Pierre Sokolsky and published by CRC Press. This book was released on 2018-03-08 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cosmic ray physics has recently attracted a great deal of attention from the high energy physics community because of the discovery of new sources and the advent of new techniques. The result of a series of lectures prepared for graduate students and postdoctoral researchers, this book is a general introduction to experimental techniques and results in the field of ultrahigh energy cosmic rays. It succinctly summarizes the rapidly developing field, and provides modern results that include data from newer detectors. Combining experiment and theory, the text explores the results of a single, easy-to-understand experiment to tie together various issues involved in the physics of ultrahigh energy cosmic rays.
Download or read book Astrophysical Aspects Of The Most Energetic Cosmic Rays Proceedings Of The Icrr International Symposium written by M Nagano and published by World Scientific. This book was released on 1991-07-23 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings present new results obtained from recent observations by the Haverah Park, Yakutsk, Fly's Eye and Akeno groups on the shape of the energy spectrum, the arrival direction (point source) and the nature of the most energetic cosmic rays. They also contain an in-depth discussion of the present status of observations on discrete sources at TeV and PeV energies. A detailed discussion of the physics problems related to the origin, acceleration mechanism and propagation of the most energetic cosmic rays in the galactic and extragalactic space is given in relation to observable features.
Download or read book Cosmology And Particle Astrophysics Proceedings Of The 2002 International Symposium On Cospa 2002 written by Kin-wang Ng and published by World Scientific. This book was released on 2003-03-12 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 2002 International Symposium on Cosmology and Particle Astrophysics (CosPA2002) was held from May 31 to June 2, 2002, in Taipei, Taiwan. The topics covered during the symposium included: (1) CMB Physics: SZ Surveys, Polarizations, Large-Scale Structures, Gravitational Lensing, and Data Analysis; (2) Dark Energy and Dark Matter: Dark Matter Physics, Quintessence and the Cosmological Constant; (3) Cosmology of Ultra High Energy Cosmic Rays; (4) Inflation and New Physics: Inflation, Noncommutative Geometry, Branes and Extra Dimensions.The proceedings have been selected for coverage in:• Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)
Download or read book Astrophysics at Ultra high Energies written by Maurice Mandel Shapiro and published by World Scientific. This book was released on 2007 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces young researchers to the exciting field of ultra-high energy astrophysics including charged particles, gamma rays and neutrinos. At ultra-high energy the radiation is produced by interactions of cosmic ray particles accelerated in explosive events such as supernovae or hypernovae, black holes or, possibly, the big bang. Through direct contact with senior scientists, now actively planning the next generation of experiments/models, the excitement and motivation for research at ultra-high energy was conveyed. The underpinning of these fields is a synthesis of knowledge and techniques from nuclear and particle physics, astronomy and cosmology. Informing the participants of this background, how it was derived, and the new challenges for the future are the major goal. Further, the course has helped to foster new astrophysical research and promoted contacts, which have resulted in new collaborations.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1991 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the 2002 International Symposium on Cosmology and Particle Astrophysics written by Xiao-Gang He and published by World Scientific. This book was released on 2003 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 2002 International Symposium on Cosmology and Particle Astrophysics (CosPA2002) was held from May 31 to June 2, 2002, in Taipei, Taiwan. The topics covered during the symposium included: (1) CMB Physics: SZ Surveys, Polarizations, Large-Scale Structures, Gravitational Lensing, and Data Analysis; (2) Dark Energy and Dark Matter: Dark Matter Physics, Quintessence and the Cosmological Constant; (3) Cosmology of Ultra High Energy Cosmic Rays; (4) Inflation and New Physics: Inflation, Noncommutative Geometry, Branes and Extra Dimensions.The proceedings have been selected for coverage in: ? Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)
Download or read book Astrophysical Sources of High Energy Particles and Radiation written by M.M. Shapiro and published by Springer Science & Business Media. This book was released on 2013-04-18 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: A wide range of topics are covered, ranging from supernovae to active galactic nuclei, cosmic gamma rays to neutrinos and dark matter. The basic emphasis is on physics / astrophysics and experimental / observational techniques, scientific implications of current results, and prospects for future advances. The fields surveyed are in rapid development and the exploration of our high energy universe is proceeding rapidly, with exciting new discoveries. What unifies much of the new data is the idea of particle acceleration to enormous energies and the subsequent interactions of the particles with the local medium. It this focus that makes the book both timely and an important contribution to the field.
Download or read book Ultra high Energy Particle Astrophysics written by Shigeru Yoshida and published by Nova Publishers. This book was released on 2003 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many kinds of radiation exist in the universe, including photons and particles with a wide range of energies. Some of the radiation is produced in stars and galaxies, and some is cosmological background radiation, a relic from the history of cosmic evolution. Among all this radiation, the most energetic are cosmic ray particles: nucleons, nuclei, and even extremely energetic gamma rays. There are some observational facts about cosmic rays to give suggestions on their origin. The most important one among them is that the energy spectrum of high energy cosmic rays above 10 GeV (where the magnetic field of the sun is no longer a concern) is well represented by a power law form. This indicates cosmic ray particles are products of non-thermal processes. Their energy extends over more than 13 decades from 107 eV up to 1020 eV. In terms of its structure, the spectrum can be divided into three regions: two 'knees' and one 'ankle'. The first 'knee' appears around 3×1015 eV where the spectral power law index changes from -2.7 to -3.0. The second 'knee' is somewhere between 1017 eV and 1018 eV where the spectral slope changes from -3.0 to around -3.3. The 'ankle' is seen at or after 3×1018 eV. Above that energy the spectral slope is around -2.7, but with a large uncertainty because of poor statistics and resolution. This book deals with the final and most energetic population, the Ultra High Energy Cosmic Rays (UHECRs).
Download or read book The Formation and Evolution of Cosmic Strings written by G. W. Gibbons and published by CUP Archive. This book was released on 1990 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Particle Astrophysics and Cosmology written by M.M. Shapiro and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Study Institute, Erice, Sicily, Italy, June 20-30, 1992
Download or read book High Energy Cosmic Rays written by Todor Stanev and published by Springer Science & Business Media. This book was released on 2010-03-10 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offers an accessible text and reference (a cosmic-ray manual) for graduate students entering the field and high-energy astrophysicists will find this an accessible cosmic-ray manual Easy to read for the general astronomer, the first part describes the standard model of cosmic rays based on our understanding of modern particle physics. Presents the acceleration scenario in some detail in supernovae explosions as well as in the passage of cosmic rays through the Galaxy. Compares experimental data in the atmosphere as well as underground are compared with theoretical models
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamentals of Cosmic Particle Physics written by Maxim Khlopov and published by Springer Science & Business Media. This book was released on 2012-03-09 with total page 441 pages. Available in PDF, EPUB and Kindle. Book excerpt: This current updated and expanded text reflects the large number of scientific advances, both theoretically and experimentally, within the discipline of cosmoparticle physics in the last 10 years. Some of the topics that have been added, updated include but are not limited to; HND or CMD+HND scenarios being implemented into sterile neutrino scenarios, the ramifications of extending the forms of dark matter with respect to our view of neutrinos, the origin of baryon matter and the need for non-baryonic matter in current theories, problems the existence of dark matters raises with respect to cosmoparticle physics and the relationship with (meta) stable (super) weakly interacting particles predicted by the extension of the standard model, restrictions on baryon and lepton photons, as well as problems associated with cosmological expansion just to name a few. These and many other topics are readdressed in light of recent both experimental and theoretical developments. Other areas of that will be of interest to the reader include the puzzles presented by direct and indirect effects of dark matter (e.g, results of experiments such as DAMA/NaI, DAMA/LIBRA and PAMELA) may lead to nontrivial new solutions for the problem of its nature, like the existence of new stable families of quarks and leptons and composite dark matter scenario. The present work will be of interest to any researcher interested in this fascinating field dealing with fundamental interactions of the micro- and macroworld.
