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dc.contributor.authorKleidis, Kostascat
dc.contributor.authorPapadopoulos, Demetrios
dc.contributor.authorVerdaguer Oms, Enric, 1950-cat
dc.contributor.authorVlahos, L. (Loukas), 1949-cat
dc.description.abstractThe equation which governs the temporal evolution of a gravitational wave (GW) in curved space-time can be treated as the Schrodinger equation for a particle moving in the presence of an effective potential. When GWs propagate in an expanding Universe with constant effective potential, there is a critical value (k_c) of the comoving wave-number which discriminates the metric perturbations into oscillating (k > k_c) and non-oscillating (k < k_c) modes. As a consequence, if the non-oscillatory modes are outside the horizon they do not freeze out. The effective potential is reduced to a non-vanishing constant in a cosmological model which is driven by a two-component fluid, consisting of radiation (dominant) and cosmic strings (sub-dominant). It is known that the cosmological evolution gradually results in the scaling of a cosmic-string network and, therefore, after some time (\Dl \ta) the Universe becomes radiation-dominated. The evolution of the non-oscillatory GW modes during \Dl \ta (while they were outside the horizon), results in the distortion of the GW power spectrum from what it is anticipated in a pure radiation-model, at present-time frequencies in the range 10^{-16} Hz < f < 10^5 Hz.-
dc.publisherThe American Physical Societyeng
dc.relation.isformatofReproducció digital del document publicat en format paper, proporcionada per PROLA i
dc.relation.ispartofPhysical Review D, 2008, vol. 78, núm. 2, p. 024027-1-024027-8cat
dc.rights(c) The American Physical Society, 2008eng
dc.sourceArticles publicats en revistes (Física de la Matèria Condensada)-
dc.subject.classificationTeoria de camps (Física)cat
dc.subject.classificationOnes gravitacionalscat
dc.subject.classificationModels de cordacat
dc.subject.classificationCordes còsmiquescat
dc.subject.otherField theory (Physics)eng
dc.subject.otherGravitational waveseng
dc.subject.otherString modelseng
dc.subject.otherCosmic stringseng
dc.titleImprints of cosmic strings on the cosmological gravitational wave backgroundeng
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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