Last edited by Vilkis
Wednesday, July 29, 2020 | History

2 edition of Cosmic strings and baryon decay catalysis found in the catalog.

Cosmic strings and baryon decay catalysis

Cosmic strings and baryon decay catalysis

  • 172 Want to read
  • 2 Currently reading

Published by Fermi National Accelerator Laboratory in Batavia IL .
Written in English

    Subjects:
  • Baryons -- Decay.

  • Edition Notes

    StatementR. Gregory ... [et al.].
    SeriesFERMILAB-conf -- 89/215-A., NASA-CR -- 186074., NASA contractor report -- NASA CR-186074.
    ContributionsGregory, R., Fermi National Accelerator Laboratory., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15278181M

    that predict strings. Cosmic strings have certain remarkable properties that could have caused them to survive to the present day. There are several ways to detect cosmic strings. When a cosmic string is formed during one of the phase transitions, it creates a wedge in space-time. Light that passes a cosmic string is deformed due to theFile Size: KB. decay of the Higgs particles in a half-life model, we show that the dramatic results of [2] are modi ed considerably. We summarize our results in section 5. 2 The Structure of Low Higgs Mass Strings In order to consider cosmic strings [6] in grand uni ed theories with low mass Higgs particles we can model the relevant features of the Higgs.

    arXiv:hep-ph/v2 2 Feb sector by gauge interactions is the existence of superconducting cosmic strings which carry baryon number. In this paper we propose a novel mechanism for or they can be used as the catalysis sites of sphaleron processes in . dominated by radiation. For a consistent cosmic string scenario, it is necessary that there exist some energy loss mechanism for the system of strings. The production and decay of closed loops is the only such mechanism. A closed loop can be formed when two segments of string intersect. If the segments.

    CHAPTER 15 Cosmic Ray Decay. On the basis of the information developed in Chapter 14 we may describe the cosmic rays in general terms as cosmic atoms and particles which enter the material environment at the speed of light, at random spatial locations, and with random directions. Here, then, are the contents of the cosmic sector of the universe as they appear, very fleetingly, to our observation. experiments like COBE and WMAP revealed that cosmic strings do not make a measurable contribution to the CMB, thus ruling out a significant role for cosmic strings. Cosmic strings were revisited in the early s when it was realized that they could also form in the context of string theory. In a string File Size: KB.


Share this book
You might also like
sonata in the classic era

sonata in the classic era

Paris of troy.

Paris of troy.

These our people

These our people

Caravan to Oregon

Caravan to Oregon

Jingle jangle

Jingle jangle

Combinatorial mathematics V

Combinatorial mathematics V

library of rare chemicals.

library of rare chemicals.

Family grandstand

Family grandstand

framework for studying minority youths transitions to fatherhood

framework for studying minority youths transitions to fatherhood

Beaufrons, or, A new-discovery of treason

Beaufrons, or, A new-discovery of treason

1992 budget.

1992 budget.

Sedimentary processes

Sedimentary processes

Energy Economics and Management in Industry

Energy Economics and Management in Industry

Social life and ceremonial bundles of the Menomini Indians.

Social life and ceremonial bundles of the Menomini Indians.

Lord Clarendons history of the Grand Rebellion compleated.

Lord Clarendons history of the Grand Rebellion compleated.

Cosmic strings and baryon decay catalysis Download PDF EPUB FB2

Cosmic Strings and Baryon Decay Catalysis. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

Baryon decay can be catalyzed by grand unified monopoles and cosmic strings because in the core of these topological defects, the gauge and scalar fields which mediate baryon number violating.

The current literature is reviewed on baryon decay catalysis by cosmic string. A summary is presented of the main arguments for decay catalysis. Baryon decay catalysis and cosmic strings. Author: Perkins, Warren Bryan.

ISNI: Awarding Body: University of Cambridge Current Institution: University of Cambridge Date of Award: Availability of Full Text: Full text unavailable from EThOS.

The current literature is reviewed on baryon decay catalysis by cosmic string. A summary is presented of the main arguments for decay by: 1. Description Cosmic strings, like monopoles, can catalyze proton decay. For integer charged fermions, the cross section for catalysis is not amplified, unlike in the case of monopoles.

The catalysis processes are reviewed both in the free quark and skyrmion pictures and the implications for baryogenesis are discussed. N2 - It is known that GUT cosmic strings carrying fractional flux can catalyse baryon decay processes with strong interaction cross sections.

We briefly review the current literature on baryon decay catalysis by cosmic strings, presenting a summary of the main arguments for decay catalysis. Bibtex entry for this abstract Preferred format for this abstract (see Preferences).

Instead, I will present a line of argument which, while incomplete, brings out what I believe to be the essential physical mechanisms underlying this rather paradoxical phenomenon. I hope to convince the baffled experimentalist as well as the skeptical theorist that sensible physics, not magic, is responsible for monopole catalysis of baryon by: 2.

Abstract Grand unified cosmic strings cataluze baryon decay, albeit only with a geometrical cross section. Nevertheless, the density of strings in the early universe could be so large that catalysis processes could wash out a substantial fraction of a primordially generated baryon-to-entropy Cited by: The effect involves baryon decay via catalysis by the topological defects.

It is well known [ 2, 3 ] that cosmic strings like mon- opoles can catalyze baryon decay. In a previous paper [ 3 ] we calculated the cross section for this process. In contrast to monopole catalyzed proton decay, the cross section is not by: A string is a geometrical deviation from Euclidean geometry in spacetime characterized by an angular deficit: a circle around the outside of a string would comprise a total angle less than °.

From the general theory of relativity such a geometrical defect must be in tension, and would be manifested by mass. Even though cosmic strings are thought to be extremely thin, they would have.

It is known that GUT cosmic strings carrying fractional flux can catalyse baryon decay processes with strong interaction cross sections.

We address the question of how the wave-function amplification factors employed in the analysis of this effect depend on the details of the distribution of the fields making up the string core, focusing on a class of models for which the relevant fields Cited by: 1.

Volumenumber 3,4 PHYSICS LETTERS B 4 October Catalysis of proton decay by cosmic strings at finite temperature Andrew Matheson, Leandros Perivolaropoulos, Warren Perkins ', Anne-Christine Davis ''2 and Robert H.

Brandenberger Physics Department, Brown University, Providence, RI, USA Received 24 April We determine the finite temperature corrections to elastic and Cited by: 2. Baryogenesis from Long Cosmic Strings Masoud Mohazzab1 Institute for Studies in Theoretical Physics and Mathematics,TehranIran.

Abstract Based on the mechanism of cusp production on long cosmic strings, the baryon asymmetry caused by cusp annihilation has been calculated. The result is compatibleCited by: 1.

A class of grand unified theories with symmetry breaking scale of order GeV have a Higgs particle with mass in the TeV scale. The cosmology of such theories is very different from usual. We study the cosmic strings obtained in such theories.

These strings are much fatter than usual and their mass per unit length is reduced, resulting in a significant reduction in their cosmological effects.

COSMIC STRINGS AND OTHER TOPOLOGICAL DEFECTS A. VILENKIN Tufts University E. SHELLARD University of Cambridge Summary of string properties and evolution Baryon decay catalysis Formation and evolution of monopoles Baryon decay can be catalyzed by grand unified monopoles and cosmic strings because in the core of these topological defects, the gauge and scalar fields which mediate baryon number violating processes are excited.

However, the baryons must be able to penetrate into. Fundamentals of Cosmic Particle Physics 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.

@article{osti_, title = {Large-scale structure from cosmic-string loops in a baryon-dominated universe}, author = {Melott, A L and Scherrer, R J}, abstractNote = {The results are presented of a numerical simulation of the formation of large-scale structure in a universe with Omega(0) = and h = dominated by baryons in which cosmic strings provide the initial density perturbations.

Grand unified theories can admit cosmic stringswith fermion zero modes. Such zero modes result in thestring being current-carrying and the formation ofstable remnants, vortons.

However, the string zero modes do not automatically survive subsequentphase transitions. In this case the vortons is possible that the dissipating cosmic vortonscreate the observed baryon asymmetry of Author: A.

C. Davis.density. Cosmic strings 4 are also topological defects of grand unified theories; thus like monopoles, they too can catalyse baryon decay. If however, one intends to use cosmic strings as a means of explaining structure formation, then inflation must not dilute the string network.

Therefore the question of baryon decay becomes important: If cosmic.