Physics – Condensed Matter – Superconductivity
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990liaco..29...33s&link_type=abstract
In ESA, From Ground-Based to Space-Borne Sub-mm Astronomy p 33-36 (SEE N91-21986 13-89)
Physics
Condensed Matter
Superconductivity
Background Radiation, Cosmic Background Explorer Satellite, Cosmology, Galactic Evolution, Gravitational Waves, Strings, Superconductivity, Chemical Properties, Constraints, Electromagnetic Interactions
Scientific paper
Constraints placed upon Superconducting Cosmic Strings (SCS) by preliminary results from the Cosmic Background Explorer (COBE) are reviewed. The cosmological evolution of SCS is placed under new constraints by millisecond pulsar timing measurements from COBE. The following constraints are obtained: the comptonization parameter due to SCS less than or equal to 0.001; the chemical potential due to SCS is less than or equal to 0.0005; the electromagnetic to gravitational radiation ratio of SCS is less than or equal to 0.023; on the string parameter GMu less than or equal to 0.000001 for generic values of string evolution parameters, GMu is less than or equal to 10-7 when tacking into account numerical simulation results. The latests PSR1937+21 timing measurements and the early COBE results converge to the same upper limits on Gmu; the limits continue to descend but the breaking point is not yet reached.
Sánchez Nadia
Signore Michele
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