Internal heating and thermal emission from old neutron stars -: Constraints on dense-matter and gravitational physics

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dc.contributor.authorReisenegger, Andreas
dc.contributor.authorFernandez, Rodrigo
dc.contributor.authorJofre, Paula
dc.date.accessioned2025-01-21T01:05:35Z
dc.date.available2025-01-21T01:05:35Z
dc.date.issued2007
dc.description.abstractThe equilibrium composition of neutron star matter is achieved through weak interactions (direct and inverse beta decays), which proceed on relatively long time scales. If the density of a matter element is perturbed, it will relax to the new chemical equilibrium through non-equilibrium reactions, which produce entropy that is partly released through neutrino emission, while a similar fraction heats the matter and is eventually radiated as thermal photons. We examined two possible mechanisms causing such density perturbations: (1) the reduction in centrifugal force caused by spin-down (particularly in millisecond pulsars), leading to rotochemical heating, and (2) a hypothetical time-variation of the gravitational constant, as predicted by some theories of gravity and current cosmological models, leading to gravitochemical heating. If only slow weak interactions are allowed in the neutron star (modified Urca reactions, with or without Cooper pairing), rotochemical heating can account for the observed ultraviolet emission from the closest millisecond pulsar, PSR J0437-4715, which also provides a constraint on vertical bar dG/dt vertical bar of the same order as the best available in the literature.
dc.fechaingreso.objetodigital2025-07-04
dc.fuente.origenWOS
dc.identifier.doi10.1007/s10509-007-9331-0
dc.identifier.eissn1572-946X
dc.identifier.issn0004-640X
dc.identifier.urihttps://doi.org/10.1007/s10509-007-9331-0
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95961
dc.identifier.wosidWOS:000246351000051
dc.issue.numeroNo. 1-4
dc.language.isoen
dc.nota.accesocontenido parcial
dc.pagina.final418
dc.pagina.inicio413
dc.revistaAstrophysics and space science
dc.rightsacceso restringido
dc.subjectstars : neutron
dc.subjectdense matter
dc.subjectrelativity
dc.subjectstars : rotation
dc.subjectpulsars : general
dc.subjectpulsars : individual (PSR B0950+08, PSR J0108-1431, PSR J0437-4715)
dc.titleInternal heating and thermal emission from old neutron stars -: Constraints on dense-matter and gravitational physics
dc.typeartículo
dc.volumenVol. 308
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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