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DC Field | Value | Language |
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dc.contributor.author | Kleidis, Kostas | cat |
dc.contributor.author | Papadopoulos, Demetrios B. | cat |
dc.contributor.author | Verdaguer Oms, Enric, 1950- | cat |
dc.contributor.author | Vlahos, L. (Loukas), 1949- | cat |
dc.date.accessioned | 2010-05-06T09:40:27Z | - |
dc.date.available | 2010-05-06T09:40:27Z | - |
dc.date.issued | 2008 | cat |
dc.identifier.issn | 0556-2821 | cat |
dc.identifier.uri | http://hdl.handle.net/2445/12387 | - |
dc.description.abstract | The 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.format.extent | 8 p. | cat |
dc.format.mimetype | application/pdf | eng |
dc.language.iso | eng | eng |
dc.publisher | The American Physical Society | eng |
dc.relation.isformatof | Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevD.78.024027 | cat |
dc.relation.ispartof | Physical Review D, 2008, vol. 78, núm. 2, p. 024027-1-024027-8 | cat |
dc.relation.uri | http://doi.org/10.1103/PhysRevD.78.024027 | - |
dc.rights | (c) The American Physical Society, 2008 | eng |
dc.source | Articles publicats en revistes (Física de la Matèria Condensada) | - |
dc.subject.classification | Teoria de camps (Física) | cat |
dc.subject.classification | Ones gravitacionals | cat |
dc.subject.classification | Models de corda | cat |
dc.subject.classification | Cordes còsmiques | cat |
dc.subject.other | Field theory (Physics) | eng |
dc.subject.other | Gravitational waves | eng |
dc.subject.other | String models | eng |
dc.subject.other | Cosmic strings | eng |
dc.title | Imprints of cosmic strings on the cosmological gravitational wave background | eng |
dc.type | info:eu-repo/semantics/article | eng |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 559815 | cat |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Física de la Matèria Condensada) |
Files in This Item:
File | Description | Size | Format | |
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559815.pdf | 166.2 kB | Adobe PDF | View/Open |
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