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GR: Fachverband Gravitation und Relativitätstheorie
GR 11: Relativistic Astrophysics II
GR 11.1: Vortrag
Mittwoch, 13. März 2024, 15:45–16:05, HBR 14: HS 2
Universal relations for bulk quantities of rapidly rotating neutron stars — •Christian J. Krüger1 and Sebastian H. Völkel2 — 1Theoretical Astrophysics, IAAT, University of Tübingen, D-72076 Tübingen, Germany — 2Max Planck Institute for Gravitational Physics (Albert Einstein Institute), D-14476 Potsdam, Germany
Neutron stars are compact objects whose interior composition is largely unknown and various rather different potential compositions are being debated. Furthermore, astrophysical neutron stars rotate, causing them to be oblate and their fluid bulk quantities to differ significantly from their nonrotating counterparts. Calculating these bulk quantities requires the computationally rather expensive solution of elliptic PDEs while neglecting rotational effects will inevitably result in bias when performing parameter estimation. Despite their complex physical nature, the impact of rotation on neutron stars exhibits quite universal patterns. In this talk, I will present universal relations that allow to estimate fluid bulk quantities of rapidly rotating neutron stars based on mass M, radius R and moment of inertia I of an associated nonrotating neutron star [1], which considerably reduces the computational expense. In extension of the cited work, I will present estimates for additional fluid bulk quantities which will be based on a newly generated set of neutron star models, thereby reducing potential bias in the relations.
[1] Krüger and Völkel, PRD 108 124056 (2023), arXiv:2309.05643
Keywords: neutron stars; fast rotation; universal relation; asteroseismology; gravitational waves