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Tidal deformability of fermion-boson stars: neutron stars admixed with ultralight dark matter

  • In this work we investigate the tidal deformability of a neutron star admixed with dark matter, modeled as a massive, self-interacting, complex scalar field. We derive the equations to compute the tidal deformability of the full Einstein-Hilbert-Klein-Gordon system self-consistently, and probe the influence of the scalar field mass and self-interaction strength on the total mass and tidal properties of the combined system. We find that dark matter core-like configurations lead to more compact objects with smaller tidal deformability, and dark matter cloud-like configurations lead to larger tidal deformability. Electromagnetic observations of certain cloud-like configurations would appear to violate the Buchdahl limit. The self-interaction strength is found to have a significant effect on both mass and tidal deformability. We discuss observational constraints and the connection to anomalous detections. We also investigate how this model compares to those with an effective bosonic equation of state and find the interaction strength where they converge sufficiently.

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Metadaten
Author:Robin Fynn DiedrichsORCiD, Niklas BeckerORCiDGND, Cédric JockelORCiD, Jan-Erik ChristianORCiDGND, Laura SagunskiORCiDGND, Jürgen Schaffner-BielichORCiDGND
URN:urn:nbn:de:hebis:30:3-868124
URL:https://arxiv.org/abs/2303.04089v2
DOI:https://doi.org/10.48550/arXiv.2303.04089
ArXiv Id:http://arxiv.org/abs/2303.04089v2
Parent Title (English):arXiv
Publisher:arXiv
Document Type:Preprint
Language:English
Date of Publication (online):2023/09/22
Date of first Publication:2023/09/22
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2024/08/31
Issue:2303.04089v2
Edition:Version 2
Page Number:17
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International