date: 2024-02-06T10:36:45Z
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pdf:docinfo:title: Fermion Proca Stars: Vector-Dark-Matter-Admixed Neutron Stars
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Keywords: self-interacting dark matter; ultralight bosons; dark matter admixed neutron stars; boson stars; Proca stars; fermion boson stars; fermion Proca stars
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subject: Dark matter could accumulate around neutron stars in sufficient amounts to affect their global properties. In this work, we study the effect of a specific model for dark matter?a massive and self-interacting vector (spin-1) field?on neutron stars. We describe the combined systems of neutron stars and vector dark matter using Einstein?Proca theory coupled to a nuclear matter term and find scaling relations between the field and metric components in the equations of motion. We construct equilibrium solutions of the combined systems, compute their masses and radii, and also analyze their stability and higher modes. The combined systems admit dark matter (DM) core and cloud solutions. Core solutions compactify the neutron star component and tend to decrease the total mass of the combined system. Cloud solutions have the inverse effect. Electromagnetic observations of certain cloud-like configurations would appear to violate the Buchdahl limit. This could make Buchdahl-limit-violating objects smoking gun signals for dark matter in neutron stars. The self-interaction strength is found to significantly affect both mass and radius. We also compare fermion Proca stars to objects where the dark matter is modeled using a complex scalar field. We find that fermion Proca stars tend to be more massive and geometrically larger than their scalar field counterparts for equal boson masses and self-interaction strengths. Both systems can produce degenerate masses and radii for different amounts of DM and DM particle masses.
dc:creator: Cédric Jockel and Laura Sagunski
dcterms:created: 2024-02-06T08:36:38Z
Last-Modified: 2024-02-06T10:36:45Z
dcterms:modified: 2024-02-06T10:36:45Z
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title: Fermion Proca Stars: Vector-Dark-Matter-Admixed Neutron Stars
Last-Save-Date: 2024-02-06T10:36:45Z
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pdf:docinfo:keywords: self-interacting dark matter; ultralight bosons; dark matter admixed neutron stars; boson stars; Proca stars; fermion boson stars; fermion Proca stars
pdf:docinfo:modified: 2024-02-06T10:36:45Z
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dc:title: Fermion Proca Stars: Vector-Dark-Matter-Admixed Neutron Stars
modified: 2024-02-06T10:36:45Z
cp:subject: Dark matter could accumulate around neutron stars in sufficient amounts to affect their global properties. In this work, we study the effect of a specific model for dark matter?a massive and self-interacting vector (spin-1) field?on neutron stars. We describe the combined systems of neutron stars and vector dark matter using Einstein?Proca theory coupled to a nuclear matter term and find scaling relations between the field and metric components in the equations of motion. We construct equilibrium solutions of the combined systems, compute their masses and radii, and also analyze their stability and higher modes. The combined systems admit dark matter (DM) core and cloud solutions. Core solutions compactify the neutron star component and tend to decrease the total mass of the combined system. Cloud solutions have the inverse effect. Electromagnetic observations of certain cloud-like configurations would appear to violate the Buchdahl limit. This could make Buchdahl-limit-violating objects smoking gun signals for dark matter in neutron stars. The self-interaction strength is found to significantly affect both mass and radius. We also compare fermion Proca stars to objects where the dark matter is modeled using a complex scalar field. We find that fermion Proca stars tend to be more massive and geometrically larger than their scalar field counterparts for equal boson masses and self-interaction strengths. Both systems can produce degenerate masses and radii for different amounts of DM and DM particle masses.
pdf:docinfo:subject: Dark matter could accumulate around neutron stars in sufficient amounts to affect their global properties. In this work, we study the effect of a specific model for dark matter?a massive and self-interacting vector (spin-1) field?on neutron stars. We describe the combined systems of neutron stars and vector dark matter using Einstein?Proca theory coupled to a nuclear matter term and find scaling relations between the field and metric components in the equations of motion. We construct equilibrium solutions of the combined systems, compute their masses and radii, and also analyze their stability and higher modes. The combined systems admit dark matter (DM) core and cloud solutions. Core solutions compactify the neutron star component and tend to decrease the total mass of the combined system. Cloud solutions have the inverse effect. Electromagnetic observations of certain cloud-like configurations would appear to violate the Buchdahl limit. This could make Buchdahl-limit-violating objects smoking gun signals for dark matter in neutron stars. The self-interaction strength is found to significantly affect both mass and radius. We also compare fermion Proca stars to objects where the dark matter is modeled using a complex scalar field. We find that fermion Proca stars tend to be more massive and geometrically larger than their scalar field counterparts for equal boson masses and self-interaction strengths. Both systems can produce degenerate masses and radii for different amounts of DM and DM particle masses.
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pdf:docinfo:creator: Cédric Jockel and Laura Sagunski
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creator: Cédric Jockel and Laura Sagunski
meta:author: Cédric Jockel and Laura Sagunski
dc:subject: self-interacting dark matter; ultralight bosons; dark matter admixed neutron stars; boson stars; Proca stars; fermion boson stars; fermion Proca stars
meta:creation-date: 2024-02-06T08:36:38Z
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meta:keyword: self-interacting dark matter; ultralight bosons; dark matter admixed neutron stars; boson stars; Proca stars; fermion boson stars; fermion Proca stars
Author: Cédric Jockel and Laura Sagunski
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