On the relativistic precession and oscillation frequencies of test particles around rapidly rotating compact stars

dc.creatorPachón Contreras, Leonardo Augusto
dc.creatorRueda Hernández, Jorge Armando
dc.creatorValenzuela Toledo, Cesar Alonso
dc.date2023-06-01T15:01:18Z
dc.date2023-06-01T15:01:18Z
dc.date2012
dc.date.accessioned2024-04-23T18:04:00Z
dc.date.available2024-04-23T18:04:00Z
dc.identifier0004-637X
dc.identifierhttps://hdl.handle.net/10495/35226
dc.identifier10.1088/0004-637X/756/1/82
dc.identifier1538-4357
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/9230353
dc.descriptionABSTRACT:Whether analytic exact vacuum(electrovacuum) solutions of the Einstein(Einstein-Maxwell) field equations can accurately describe or not the exterior spacetime of compact stars remains still an interesting open question in Relativistic Astrophysics. As an attempt to establish their level of accuracy, the radii of the Innermost Stable Circular Orbits (ISCOs) of test particles given by analytic exterior spacetime geometries have been compared with the ones given by numerical solutions for neutron stars (NSs) obeying a realistic equation of state (EoS). It has been so shown that the six-parametric solution of Pach´on, Rueda, and Sanabria (2006) (hereafter PRS) is more accurate to describe the NS ISCO radii than other analytic models. We propose here an additional test of accuracy for analytic exterior geometries based on the comparison of orbital frequencies of neutral test particles. We compute the Keplerian, frame-dragging, as well as the precession and oscillation frequencies of the radial and vertical motions of neutral test particles for the Kerr and PRS geometries; then we compare them with the numerical values obtained by Morsink and Stella (1999) for realistic NSs. We identify the role of highorder multipole moments such as the mass quadrupole and current octupole in the determination of the orbital frequencies especially in the rapid rotation regime. The results of this work are relevant to cast a separatrix between black hole (BH) and NS signatures as well as probe the nuclear matter EoS and NS parameters from the Quasi-Periodic Oscillations (QPOs) observed in Low Mass X-Ray Binaries.
dc.descriptionCOL0008441
dc.format14
dc.formatapplication/pdf
dc.formatapplication/pdf
dc.languageeng
dc.publisherInstitute of Physics Publishing (IOP)
dc.publisherAmerican Astronomical Society
dc.publisherGrupo de Física Atómica y Molecular
dc.publisherChicago, Estados Unidos
dc.relationAstrophys. J.
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rightshttp://creativecommons.org/licenses/by/2.5/co/
dc.rightshttp://purl.org/coar/access_right/c_abf2
dc.rightshttps://creativecommons.org/licenses/by/4.0/
dc.subjectCosmología cuántica
dc.subjectQuantum Cosmology
dc.subjectAstrofísica
dc.subjectAstrophysics
dc.subjectEcuaciones de Maxwell
dc.subjectMaxwell equations
dc.subjectAgujeros negros (astronomía)
dc.subjectBlack holes (astronomy)
dc.subjectMecánica celeste
dc.subjectMechanics, celestial
dc.subjectEstrrellas
dc.subjectStars
dc.subjectRelatividad general (física)
dc.subjectGeneral relativity (Physics)
dc.subjecthttp://id.loc.gov/authorities/subjects/sh2005001325
dc.titleOn the relativistic precession and oscillation frequencies of test particles around rapidly rotating compact stars
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typehttp://purl.org/coar/resource_type/c_2df8fbb1
dc.typehttps://purl.org/redcol/resource_type/ART
dc.typeArtículo de investigación


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