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dc.contributor.CRUESPUNIVERSIDADE DE ESTADUAL DE CAMPINASpt_BR
dc.identifier.isbnnullpt
dc.typeArtigo de periódicopt_BR
dc.titleFundamental Oscillation Modes Of Neutron Stars: Validity Of Universal Relationspt_BR
dc.contributor.authorChirenti C.pt_BR
dc.contributor.authorDe Souza G.H.pt_BR
dc.contributor.authorKastaun W.pt_BR
unicamp.authorDe Souza, G.H., Instituto de Física Gleb Wataghin, UNICAMPCampinas-SP, Brazilpt_BR
unicamp.author.externalChirenti, C., Centro de Matemática, Computação e Cognição, UFABCSanto André-SP, Brazilpt
unicamp.author.externalKastaun, W., Physics Department, University of Trento, via Sommarive 14Trento, Italypt
dc.description.abstractWe study the f-mode frequencies and damping times of nonrotating neutron stars (NS) in general relativity by solving the linearized perturbation equations, with the aim to establish "universal" relations that depend only weakly on the equations of state (EOS). Using a more comprehensive set of EOSs, we reexamine some proposed empirical relations that describe the f-mode parameters in terms of mass and radius of the NS, and we test a more recent proposal for expressing the f-mode parameters as quadratic functions of the effective compactness. Our extensive results for each equation of state considered allow us to study the accuracy of each proposal. In particular, the empirical relation proposed in the literature for the damping time in terms of the mass and radius deviates considerably from our results. We introduce a new universal relation for the product of the f-mode frequency and damping time as a function of the (ordinary) compactness, which proved to be more accurate. The more recently proposed relations using the effective compactness, on the other hand, also fit our data accurately. Our results show that the maximum oscillation frequency depends strongly on the EOS, such that the measurement of a high oscillation frequency would rule out several EOSs. Lastly, we compare the exact mode frequencies to those obtained in the Cowling approximation, and also to results obtained with a nonlinear evolution code, validating the implementations of the different approaches.en
dc.relation.ispartofPhysical Review D - Particles, Fields, Gravitation and Cosmologypt_BR
dc.publisherAmerican Physical Societypt_BR
dc.date.issued2015pt_BR
dc.identifier.citationPhysical Review D - Particles, Fields, Gravitation And Cosmology. American Physical Society, v. 91, n. 4, p. - , 2015.pt_BR
dc.language.isoenpt_BR
dc.description.volume91pt_BR
dc.description.issuenumber4pt_BR
dc.description.lastpagept_BR
dc.rightsabertopt_BR
dc.sourceScopuspt_BR
dc.identifier.issn15507998pt_BR
dc.identifier.doi10.1103/PhysRevD.91.044034pt_BR
dc.identifier.urlhttp://www.scopus.com/inward/record.url?eid=2-s2.0-84923279029&partnerID=40&md5=740d0911b8a64c123ec215ef7bee9c00pt_BR
dc.date.available2015-06-25T12:53:28Z
dc.date.available2015-11-26T15:09:56Z-
dc.date.accessioned2015-06-25T12:53:28Z
dc.date.accessioned2015-11-26T15:09:56Z-
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dc.description.provenanceMade available in DSpace on 2015-11-26T15:09:56Z (GMT). No. of bitstreams: 2 2-s2.0-84923279029.pdf: 602497 bytes, checksum: 0ed898a054a5cc68928011f24368d96d (MD5) 2-s2.0-84923279029.pdf.txt: 41714 bytes, checksum: d36e7f872291ffc1737203c374379b47 (MD5) Previous issue date: 2015en
dc.identifier.urihttp://www.repositorio.unicamp.br/handle/REPOSIP/85477
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/85477-
dc.identifier.idScopus2-s2.0-84923279029pt_BR
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