Dynamical non-axisymmetric instabilities in rotating relativistic stars
| dc.creator | Manca, G. M. | |
| dc.creator | Baiotti, L. | |
| dc.creator | De Pietri, R. | |
| dc.creator | Rezzolla, L. | |
| dc.date | 2007-05-13 | |
| dc.date.accessioned | 2026-07-07T10:55:32Z | |
| dc.date.available | 2026-07-07T10:55:32Z | |
| dc.description | We present new results on dynamical instabilities in rapidly rotating neutron-stars. In particular, using numerical simulations in full General Relativity, we analyse the effects that the stellar compactness has on the threshold for the onset of the dynamical bar-mode instability, as well as on the appearance of other dynamical instabilities. By using an extrapolation technique developed and tested in our previous study [1], we explicitly determine the threshold for a wide range of compactnesses using four sequences of models of constant baryonic mass comprising a total of 59 stellar models. Our calculation of the threshold is in good agreement with the Newtonian prediction and improves the previous post-Newtonian estimates. In addition, we find that for stars with sufficiently large mass and compactness, the m=3 deformation is the fastest growing one. For all of the models considered, the non-axisymmetric instability is suppressed on a dynamical timescale with an m=1 deformation dominating the final stages of the instability. These results, together with those presented in [1], suggest that an m=1 deformation represents a general and late-time feature of non-axisymmetric dynamical instabilities both in full General Relativity and in Newtonian gravity. | |
| dc.description | To appear on CQG, NFNR special issue. 16 pages, 5 color figures, movies from http://www.fis.unipr.it/numrel/BarMode/ResearchBarMode.html | |
| dc.identifier | https://arxiv.org/abs/0705.1826 | |
| dc.identifier | http://arxiv.org/abs/0705.1826 | |
| dc.identifier | Class.Quant.Grav.24:S171-S186,2007 | |
| dc.identifier | doi:10.1088/0264-9381/24/12/S12 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/186107 | |
| dc.subject | Astrophysics | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.title | Dynamical non-axisymmetric instabilities in rotating relativistic stars | |
| dc.type | text |