Aspects Of Cosmic Acceleration
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Aspects Of Cosmic Acceleration
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Author :
language : en
Publisher:
Release Date : 2019
Aspects Of Cosmic Acceleration written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Cosmic Ray Physics
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Author : Sachio Hayakawa
language : en
Publisher: John Wiley & Sons
Release Date : 1969
Cosmic Ray Physics written by Sachio Hayakawa and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Science categories.
On The Acceleration Dynamics And Propagation Of Cosmic Rays
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Author : Paul Simeon
language : en
Publisher:
Release Date : 2014
On The Acceleration Dynamics And Propagation Of Cosmic Rays written by Paul Simeon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
The complete story of the origin, acceleration, and propagation of cosmic rays has remained a mystery for over a century. No conclusive evidence exists for how supernova remnants, the known sources of at least a large fraction of galactic cosmic rays, can accelerate cosmic rays up to the required energies. The origin of extragalactic cosmic rays is still completely unknown, with active galactic nuclei, gamma-ray bursts, certain types of neutron stars, and large scale shocks being the most popular candidates. This dissertation focuses on three separate but related topics: the interaction of anisotropic plasmas and cosmic rays, the propagation of cosmic rays in the presence of dense gas clouds, and the acceleration of extragalactic cosmic rays by strong accretion shocks around clusters and filaments of galaxies. The first major topic relaxes the common assumption that astrophysical plasmas have an isotropic pressure distribution caused by the presence of a magnetic field. We derive the dispersion relation for such a plasma with anisotropic magnetohydrodynamics as well as instabilities that are likely to amplify the magnetic field. This amplification may help to explain how shock fronts amplify the ambient magnetic field and accelerate cosmic rays to higher energies. The second major section examines the effect of dense gas clouds on the magnetic field and consequently on the propagation and emission of cosmic rays. This chapter is an attempt to gain insight on the gamma-ray spectrum of supernova remnants in such environments, where the spatial distribution and the spectral index of cosmic rays remains unexplained. The third topic uses new observations and simulations to modify a model of ultra-high-energy cosmic rays from strong accretion shocks. New evidence suggests that shocks around the large-scale structure of the universe -- not only shocks around galaxy clusters -- are adequate for accelerating cosmic rays up to the highest energies. Though the composition of these particles remains unknown, we propose two potential composition models, one with only protons and one with protons and heavy nuclei. Though the applications and environments discussed in each chapter varies, the underlying principles are similar. The full story of cosmic rays is not a simple one, and we hope that additions we have added to the standard theory provide useful tools for understanding other aspects of cosmic rays and perhaps other areas of astrophysics.
Astrophysical Aspects Of The Most Energetic Cosmic Rays Proceedings Of The Icrr International Symposium
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Author : M Nagano
language : en
Publisher: World Scientific
Release Date : 1991-07-23
Astrophysical Aspects Of The Most Energetic Cosmic Rays Proceedings Of The Icrr International Symposium written by M Nagano and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991-07-23 with categories.
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.
Simulating Large Scale Structure For Models Of Cosmic Acceleration
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Author : Baojiu Li
language : en
Publisher: IOP Publishing Limited
Release Date : 2018-10-30
Simulating Large Scale Structure For Models Of Cosmic Acceleration written by Baojiu Li and has been published by IOP Publishing Limited this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-30 with Science categories.
Simulating Large Scale Structure for Models of Cosmic Acceleration explores alternative cosmological models and how we can learn from these as well as differentiate them from the standard cosmic model. The book also looks at the ways in which techniques can be used to accurately develop and test the model to produce new observations. This self-contained book provides a fundamental guide to researchers looking to enter the field of cosmological simulations. Postgraduate students will also find it of use as the need for numerical simulations and astronomical surveys increases. The book contains a significant amount of Professor Li's own research as well as assistance from other experts and collaborators in the field and will certainly encourage others to explore the ever-expanding world of cosmic acceleration.
Acceleration Mechanisms For Ultra High Energy Cosmic Rays
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Author : Ahmed Saleh
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2012-07
Acceleration Mechanisms For Ultra High Energy Cosmic Rays written by Ahmed Saleh and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-07 with categories.
The discovery and detection of ultra high energy cosmic rays (UHECRs) of energy up to 10 DEGREES20 eV have posed a serious challenge to the astrophysicists about their origin as well as the physical acceleration mechanisms. Some theoretical approaches in the past assuming elastic scatterings of cosmic charged particles with magnetic clouds then developed by assuming the presence of shock waves originated from supernova remnant succeeded to explain the existence of energies up to 10 DEGREES15 eV. The assumption of particle-electromagnetic field interaction with constant fields succeeded to interpret the possibility of finding cosmic particles of energies up to 10 DEGREES20 eV. From the astrophysical plasma aspects, the interaction of cosmic charged particles with the time varying magnetic field, like that present in the magnetosphere of pulsar and magnetar, as potent sources can lead to higher energies. Moreover, the coupling of the cosmic charged particle-spatially varying electromagnetic field interaction and the well-known Fermi mechanisms furnish a reasonable theoretical approach to interpret the existence of UHECRs of ener
Energy Budget In The High Energy Universe Proceedings Of The International Workshop
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Author : Katsuhiko Sato
language : en
Publisher: World Scientific
Release Date : 2007-03-06
Energy Budget In The High Energy Universe Proceedings Of The International Workshop written by Katsuhiko Sato and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-03-06 with Science categories.
The existence of materials with very high specific energies greatly exceeding the local virial temperature is best represented by cosmic rays, whose origin has long been a mystery. Recent astrophysical observations in X-ray, gamma-ray, neutrino, and high energy cosmic ray experiments, in conjunction with theoretical studies, have revealed various new aspects of the high energy universe, including promising candidates for cosmic ray acceleration sites. As each approach has its own advantages and limitations, it is expected that joint efforts by experimentalists and theorists in various related fields are essential.The contributions in this volume include observation of the universe through a wide range of techniques for detecting cosmic rays, neutrinos, X-rays and gamma-rays, as well as theoretical considerations in understanding their nature and astrophysical aspects.
Astrophysical Aspects Of The Most Energetic Cosmic Rays
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Author :
language : en
Publisher:
Release Date : 1991
Astrophysical Aspects Of The Most Energetic Cosmic Rays written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with SCIENCE categories.
Simulating Large Scale Structure For Models Of Cosmic Acceleration
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Author : Baojiu Li
language : en
Publisher:
Release Date : 2018-10-30
Simulating Large Scale Structure For Models Of Cosmic Acceleration written by Baojiu Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-30 with categories.
Some Aspects Of F R Theories
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Author : Ghosh Soumendu
language : en
Publisher: Independent Author
Release Date : 2022-12-14
Some Aspects Of F R Theories written by Ghosh Soumendu and has been published by Independent Author this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-12-14 with categories.
General Relativity is widely accepted as a fundamental theory to describe the geometric properties of spacetime.In a homogeneous and isotropic spacetime the Einstein field equations give rise to the Friedmann equations that describe the evolution of the universe.In fact, the standard big bang cosmology based on radiation and matter dominated epochs can be well described within the framework of General Relativity. However the rapid development of observational cosmology shows that the universe has undergone two phases of cosmic acceleration.The first one is called inflation, which is believed to have occurred prior to the radiation domination.This phase is required not only to solve the flateness and horizon problems plauged in big bang cosmology, but also to explain a nearly flat spectrum of temperature anisotropies observed in Cosmic Microwave Background(CMB).The second accelerating phase has started after the matter domination.The unknown component giving rise to this late-time Cosmic acceleration is called dark energy.The existence of dark energy has been confirmed by a number of observations - such as supernova Ia (SN Ia), large scale structure, baryon acoustic oscillations (BAO) and CMB.