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DC Field | Value | Language |
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dc.contributor.author | Kleidis, Kostas | - |
dc.contributor.author | Kuiroukidis, Apostolos | - |
dc.contributor.author | Papadopoulos, Demetrios B. | - |
dc.contributor.author | Verdaguer Oms, Enric, 1950- | - |
dc.date.accessioned | 2019-04-08T10:57:40Z | - |
dc.date.available | 2019-04-08T10:57:40Z | - |
dc.date.issued | 2011-12-23 | - |
dc.identifier.issn | 1550-7998 | - |
dc.identifier.uri | http://hdl.handle.net/2445/131760 | - |
dc.description.abstract | In a previous paper [K. Kleidis, D. B. Papadopoulos, E. Verdaguer, and L. Vlahos, Phys. Rev. D 78, 024027 (2008).] we considered the possibility that (within the early-radiation epoch) there has been (also) a short period of a significant presence of cosmic strings. During this radiation-plus-strings stage the Universe matter-energy content can be modeled by a two-component fluid, consisting of radiation (dominant) and a cosmic-string fluid (subdominant). It was found that, during this stage, the cosmological gravitational waves that had been produced in an earlier (inflationary) epoch with comoving wave numbers below a critical value (which depends on the physics of the cosmic-string network) were filtered, leading to a distorsion in the expected (scale-invariant) cosmological gravitational wave power spectrum. In any case, the cosmological evolution gradually results in the scaling of any long-cosmic-string network and, hence, after a short time interval, the Universe enters into the late-radiation era. However, along the transition from an early-radiation epoch to the late-radiation era through the radiation-plus-strings stage, the time dependence of the cosmological scale factor is modified, something that leads to a discontinuous change of the corresponding scalar curvature, which, in turn, triggers the quantum-mechanical creation of gravitons. In this paper we discuss several aspects of such a process, and, in particular, the observational consequences on the expected gravitational-wave power spectrum. | - |
dc.format.extent | 13 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | American Physical Society | - |
dc.relation.isformatof | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.84.124044 | - |
dc.relation.ispartof | Physical Review D, 2011, vol. 84, num. 12, p. 124044 | - |
dc.relation.uri | https://doi.org/10.1103/PhysRevD.84.124044 | - |
dc.rights | (c) American Physical Society, 2011 | - |
dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | - |
dc.subject.classification | Gravitació | - |
dc.subject.classification | Cosmologia | - |
dc.subject.other | Gravitation | - |
dc.subject.other | Cosmology | - |
dc.title | Graviton production in the scaling of a long-cosmic-string network | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 602841 | - |
dc.date.updated | 2019-04-08T10:57:40Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) Articles publicats en revistes (Física Quàntica i Astrofísica) |
Files in This Item:
File | Description | Size | Format | |
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602841.pdf | 255.04 kB | Adobe PDF | View/Open |
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