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Tuesday, July 21, 2020 | History

3 edition of Grand unified theories, topological defects and ultrahigh-energy cosmic rays found in the catalog.

Grand unified theories, topological defects and ultrahigh-energy cosmic rays

Grand unified theories, topological defects and ultrahigh-energy cosmic rays

  • 207 Want to read
  • 13 Currently reading

Published by Fermi National Accelerator Laboratory, National Aeronautics and Space Administration, National Technical Information Service, distributor in Chicago, IL, [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Grand unified theories (Nuclear physics),
  • Cosmic rays.

  • Edition Notes

    StatementPijushpani Bhattacharjee, Christopher T. Hill and David N. Schramm.
    SeriesNASA contractor report -- NASA CR-189841., Fermilab pub -- 91/304-A.
    ContributionsHill, Christopher T., Schramm, David N., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15368956M

      Abstract: The motivation and the current status of top-down models as sources of ultrahigh energy cosmic rays (UHECR) are reviewed. Stimulated by the AGASA excess, they were proposed as the main source of UHECRs beyond the GZK cutoff. Meanwhile searches for their signatures have limited their contribution to the UHECR flux to be subdominant, while the theoretical . The motivation and the current status of top-down models as sources of ultrahigh energy cosmic rays (UHECR) are reviewed. Stimulated by the AGASA excess, they were proposed as the main source of UHECRs beyond the GZK cutoff. Meanwhile searches for their signatures have limited their contribution to the UHECR flux to be subdominant, while the theoretical motivation for these searches remained.

    constrain topological defect models of highest energy cosmic ray (HECR) production. Such models have been proposed as possible sources of ultrahigh energy particles and γ-rays with energies above eV. The constraints on these models derived from 4He-photodisintegra-. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): A formalism is presented to construct a non-perturbative Grand Unified Theory when gravitational Planck-scale phenomena are included. The fundamental object on the Planck scale is the threetorus T 3 from which the known properties of superstrings, such as the geometric action and duality, follow directly.

    experiment. Topological defect models provide such a class of models. In defect models, topological defects which form during a phase transition in the very early Universe provide the seeds about which galaxies and even larger structures form by gravitational clustering. The most promising of the defect models is the cosmic string theory [2].   Alternative scenarios for UHECR origin include emission and decay of massive particles (“X-particles”) by topological defects (TD) or decay of massive primordial particles. Because of the resulting flat spectrum of particles (including neutrinos, γ-rays and protons) extending possibly up to GUT (grand unified theory) scale energies.


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Grand unified theories, topological defects and ultrahigh-energy cosmic rays Download PDF EPUB FB2

Grand Unified Theories, Topological Defects, and Ultrahigh-Energy Cosmic Rays Article (PDF Available) in Physical Review Letters 69(4) August with 24 Reads How we measure 'reads'.

The ultrahigh-energy (UHE) proton and neutrino spectra resulting from collapse or annihilation of topological defects surviving from the grand unification (GUT) era are calculated.

Irrespective of the specific process under consideration, the UHE proton spectrum ``recovers'' at ~×10 11 GeV after a partial Greisen-Zatsepin-Kuz'min ``cutoff'' at ~5× GeV and continues to a GUT Cited by:   The ultrahigh-energy (UHE) proton and neutrino spectra resulting from collapse or annihilations of topological defects surviving from the GUT era are calculated.

Irrespective of the specific process under consideration (which determines the overall normalization of the spectrum), the UHE proton spectrum always 'recovers' at approximately x 10 exp 11 GeV after a partial Greisen Author: Pijushpani Bhattacharjee, Christopher T.

Hill, David N. Schramm. (NASA-CR) GRAND UNIFIED THEORIES, N TOPOLOGICAL DEFECTS AND ULTRAHIGH-ENERGY COSMIC RAYS (Fermi National Accelerator Lab.) 12 p CSCL 03B Unclas ^ G3/93 Operated by Universities Research Association Inc.

under contract with the United States Department of Energy. The grand unified theories predict that the early universe underwent successive phase transitions which were accompanied by the formation of topological defects, such as cosmological strings and string loops.

A cosmic string under certain conditions exhibit a supercurrent which alters the string's. model, the ideas of grand unification, supersymmetry, topological defects and inflation are in-troduced. Special emphasis is given to the physics of massive neutrinos and to supersymmetric GUTs.

The elastic and inelastic scattering of fermions off cosmic strings arising in a nonsuper-symmetric SO(10) model are first studied. The origin of cosmic rays is one of the major unresolved questions in astrophysics. In particular, the highest energy cosmic rays observed have macroscopic energies up to several electron volts and thus provide a probe of physics and astrophysics at energies unattained in laboratory experiments.

Theoretical explanations range from astrophysical acceleration of charged particles, to. Topological defects are produced during phase transitions in the very early Universe. They arise in most unified theories of strong, weak and electromagnetic interactions. This article focuses on the role of topological defects in cosmology, with particular emphasis on the models of structure formation based on defects.

We consider the advantages of and the problems associated with hypotheses to explain the origin of ultrahigh energy cosmic rays (UHECR: E > 10 EeV) and the “trans-GZK” cosmic rays (TGZK: E > EeV) both through “old physics” (acceleration in cosmic sources) and “new physics” (new particles, topological defects, fat neutrino cross sections, Lorentz invariance violation).

A Grand Unified Theory is a model in particle physics in which, at high energies, the three gauge interactions of the Standard Model comprising the electromagnetic, weak, and strong forces are merged into a single force. Although this unified force has not been directly observed, the many GUT models theorize its existence.

If unification of these three interactions is possible, it raises the possibility that there was a grand unification. Certain [which?] grand unified theories predict the formation of stable topological defects in the early universe during these phase transitions.

Symmetry breakdown. Depending on the nature of symmetry breakdown, various solitons are believed to have formed in the early universe according to the Kibble-Zurek mechanism.

The well-known topological defects are. 1. Introduction. Ultrahigh energy cosmic rays (UHECRs) are among the most energetic form of radiation ever detected, with energies apparently reaching beyond 10 20 eV.

Cosmic rays with ultrahigh energies were first detected over 35 years ago by the Volcano Ranch typical event rates of one per km 2 per century, subsequent experiments including the Fly's Eye and AGASA.

Grand unified theory. One of the major theoretical hurdles to a reachable synthesis of current theories of particles and force interactions into a grand unification theory (also known as Grand Unified Field Theory, Grand Unified Theory, or GUT) is the need to reconcile the evolving principles of quantum theory with the principles of general relativity advanced by German-American physicist.

Grand unified theories, topological defects and ultrahigh-energy cosmic rays Author: Pijushpani Bhattacharjee ; Christopher T Hill ; David N Schramm ; United States.

The phase transitions in the early universe and the symmetry breaking associated with grand unified theories may produce networks of cosmic strings and other topological defects that have been. Grand Unified Theories, Topological Defects, and Ultrahigh-Energy Cosmic Rays.

Article. We predict no directional correlation of the ultrahigh-energy cosmic rays with the galactic halo. At the. Grand unified theories, topological defects and ultrahigh-energy cosmic rays By Pijushpani Bhattacharjee, Christopher T. Hill and David N. Schramm Get PDF ( KB). The massive particles can come from collapse and/or annihilation of cosmic topological defects (such as monopoles, cosmic strings, etc.) associated with Grand Unified Theories or they could be.

Grand unified theories, topological defects, and ultrahigh-energy cosmic rays. By Christopher T. Hill, David N. Schramm and Pijushpani Bhattacharjee. Abstract. The ultrahigh-energy (UHE) proton and neutrino spectra resulting from collapse or annihilations of topological defects surviving from the GUT era are calculated.

Irrespective of the. P. Bhattacharjee, C.T. Hill and D.N. Schramm, Grand unified theories, topological defects and ultrahigh- energy cosmic rays Phys. Rev. Lett. 69 Crossref PubMed Google Scholar P.

Bhattacharjee and G. Sigl, Monopole annihilation and highest energy cosmic rays Phys. Rev. D 51 [astro-ph/]. The massive particles can come from collapse and/or annihilation of cosmic topological defects (such as monopoles, cosmic strings, etc.) associated with Grand Unified Theories or they could be some long-lived metastable supermassive relic particles that were created in the early Universe and are decaying in the current epoch.

Grand Unified Theory is truely the culmination of Ross Tobia's attempts to explain a fundamental question: what is the place of life in the Universe?

This book answers profound questions. This is it – the Grand Unified Theory presented as an open door. Whether you are interested in physics, psychology, or the paranormal, read this book and see all of these "sciences" revealed in a unified Reviews: 1.Some of the proposed explanations for the origin of ultrahigh-energy cosmic rays invoke new sources of energetic photons (e.g., topological defects, relic particles, etc.).