Millimeter and radioastronomical constraints on the cosmological evolution of strings

Journal Article · Wed Apr 10 04:00:00 EDT 1991 · International Journal of Modern Physics A; (United States)

DOI:https://doi.org/10.1142/S0217751X91000848· OSTI ID:5008899

Signore, M; Sanchez, N ^[1]

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1. Ecole Normale Superieure, 75 - Paris (France)

In this paper, the authors study and place constraints on cosmic strings and on their cosmological evolution with emphasis on the results of five measurements: millisecond pulsar timings, binary pulsar timings, spatial fluctuations in the intensity of the cosmic microwave background radiation (MBR). For superconducting strings (hereafter SCS), we add two other results: the spectrum of the MBR in the Rayleigh-Jean side and in the Wien side. This authors find compatibility conditions between these five results which constrain the string evolution parameters independently of any numerical simulation result. The authors compare and comment about the gravitational decay rate of fundamental quantum strings in D = 4, which appears closely related to that of classical cosmic strings. The absence of distortion recently reported by COBE's FIRAS experiment leads to the following upper limits on: (a) the comptonization parameter, y {le} 10{sup {minus}3}; (b) the chemical potential due to SCS {mu}{sub OSCS} {le} 0.5 10{sup {minus}3}; (c) the electromagnetic radiation to gravitational radiation ratio, f {le} 2.3 10{sup {minus}2}; (d) the string parameter: G{mu} {lt} 10{sup {minus}6} for generic values of string evolution parameters, G{mu} {lt} 10{sup {minus}7} for values derived from numerical simulations. The small value of f shows that the decay of SCS must be governed by gravitation. The latest PSR 1937 + 21 timing measurements and the preliminary COBE data converge to the same upper limits on G{mu}. These limits continue to descent but the breaking point is not yet reached.

• OSTI ID: 5008899
• Journal Information: International Journal of Modern Physics A; (United States), Journal Name: International Journal of Modern Physics A; (United States) Vol. 6:9; ISSN 0217-751X; ISSN IMPAE
• Country of Publication: United States
• Language: English

Related Subjects

640106* -- Astrophysics & Cosmology-- Cosmology
645400 -- High Energy Physics-- Field Theory
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASTRONOMY
BACKGROUND RADIATION
BINARY STARS
COMPOSITE MODELS
COSMIC RADIATION
COSMIC RADIO SOURCES
COSMOLOGY
ELECTROMAGNETIC RADIATION
EXTENDED PARTICLE MODEL
FLUCTUATIONS
GRAVITATIONAL RADIATION
IONIZING RADIATIONS
MATHEMATICAL MODELS
PARTICLE MODELS
PULSARS
QUARK MODEL
RADIATIONS
RADIOASTRONOMY
SIMULATION
STARS
STRING MODELS
SUPERCONDUCTORS
VARIATIONS