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          Institute: MPI für Gravitationsphysik     Collection: Geometric Analysis and Gravitation     Display Documents

ID: 442503.0, MPI für Gravitationsphysik / Geometric Analysis and Gravitation
On the solution space of differentially rotating neutron stars in general relativity
Authors:Ansorg, Marcus; Gondek-Rosinska, Dorota; Villain, Loic
Date of Publication (YYYY-MM-DD):2009-07-11
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:4
Start Page:2359
End Page:2366
Review Status:not specified
Audience:Not Specified
Abstract / Description:A highly accurate, multidomain spectral code is used in order to construct sequences of general relativistic, differentially rotating neutron stars in axisymmetry and stationarity. For bodies with a spheroidal topology and a homogeneous or an N= 1 polytropic equation of state, we investigate the solution space corresponding to broad ranges of degree of differential rotation and stellar densities. In particular, starting from static and spherical configurations, we analyse the changes of the corresponding surface shapes as the rate of rotation is increased. For a sufficiently weak degree of differential rotation, the sequences terminate at a mass-shedding limit, while for moderate and strong rates of differential rotation they exhibit a continuous parametric transition to a regime of toroidal fluid bodies. In this article, we concentrate on the appearance of this transition, analyse in detail its occurrence and show its relevance for the calculation of astrophysical sequences. Moreover, we find that the solution space contains various types of spheroidal configurations, which were not considered in previous work, mainly due to numerical limitations.
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Huisken
Affiliations:MPI für Gravitationsphysik/Geometric Analysis and Gravitation
Identifiers:ISI:000267710400042 [ID No:1]
ISSN:0035-8711 [ID No:2]
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