Cosmological constraints on cosmic-string gravitational radiation

Journal Article · Fri May 15 00:00:00 EDT 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.45.3447· OSTI ID:7302291

Caldwell, R R; Allen, B ^[1]

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1. Department of Physics, University of Wisconsin at Milwaukee, P.O. Box 413, Milwaukee, Wisconsin 53201 (United States)

The primordial nucleosynthesis and pulsar timing noise constraints on cosmic-string gravitational radiation are computed. The computation consists of a numerical integration of the Friedmann-Robertson-Walker Einstein equations which describe a universe containing radiation, dust, and a one-scale''-model cosmic-string component. The procedure takes into account the effects of the annihilations of massive particle species on the equation of state of the cosmological fluid. An expression for the power emitted per mode of oscillation by a cosmic-string loop, suggested by both analytic calculations and recent numerical simulations, is used. The results of the computation are spectra of the cosmic-string gravitational radiation at nucleosynthesis and at present. Comparison of these spectra with the observed bounds on pulsar timing noise, and the observed bound on the effective number of light neutrino species permitted by the model of nucleosynthesis, allows one to exclude a range of values of {mu}, the cosmic-string linear mass density, for certain values of {alpha}, the size of a newly formed loop as a fraction of the particle horizon radius. We find constraints to {mu} which are more restrictive than any previous limit.

• OSTI ID: 7302291
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 45:10; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMOLOGY
GRAVITATIONAL RADIATION
STRING MODELS
ENERGY DENSITY
EQUATIONS OF STATE
GALAXIES
HUBBLE EFFECT
MASS
MATHEMATICAL MODELS
NUCLEOSYNTHESIS
PHASE TRANSFORMATIONS
STANDARD MODEL
UNIVERSE
COMPOSITE MODELS
EQUATIONS
EXTENDED PARTICLE MODEL
PARTICLE MODELS
QUARK MODEL
RADIATIONS
SYNTHESIS
UNIFIED GAUGE MODELS
662110* - General Theory of Particles & Fields- Theory of Fields & Strings- (1992-)
661100 - Classical & Quantum Mechanics- (1992-)