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Gießen 2024 – wissenschaftliches Programm

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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. Völkel21Theoretical 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

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