On the capture of dark matter by neutron stars

Abstract

We calculate the number of dark matter particles that a neutron star accumulates over its lifetime as it rotates around the center of a galaxy, when the dark matter particle is a self-interacting boson but does not self-annihilate. We take into account dark matter interactions with baryonic matter and the time evolution of the dark matter sphere as it collapses within the neutron star. We show that dark matter self-interactions play an important role in the rapid accumulation of dark matter in the core of the neutron star. We consider the possibility of determining an exclusion region of the parameter space for dark matter mass and dark matter interaction cross sections based on the observation of old neutron stars with strong dark matter self-interactions. We show that for a dark matter density of $10^3$ GeV/cm${}^3$ and dark matter mass $m_{\chi }$ less than approximately 10 GeV, there is a potential exclusion region for dark matter interactions with nucleons that is three orders of magnitude more stringent than without self-interactions. The potential exclusion region for dark matter self-interaction cross sections is many orders of magnitude stronger than the current Bullet Cluster limit. For example, for high dark matter density regions, we find that for $m_{\chi }\sim 10$ GeV when the dark matter interaction cross section with the nucleons ranges from ${\sigma }_{\chi n}\sim 10^{-52}$ cm${}^2$ to $10^{-57}$ cm${}^2$, the dark matter self-interaction cross section limit is ${\sigma }_{\chi \chi }<10^{-33}$ cm${}^2$, which is about ten orders of magnitude stronger than the Bullet Cluster limit.

12 pages, 9 figures, v2. change in treatment of dark matter collapse in neutron star, conclusions changed; v3. minor revisions of text for clarification, added references, v4. version accepted for publication in JCAP

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• Asymmetric Dark Stars and Neutron Star Stability
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• New Analysis of Neutron Star Constraints on Asymmetric Dark Matter
• Science-Driven Tunable Design of Cosmic Explorer Detectors
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• Non-Primordial Solar Mass Black Holes
• Improved Treatment of Dark Matter Capture in Neutron Stars II: Leptonic Targets
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• Improved Treatment of Dark Matter Capture in Neutron Stars III: Nucleon and Exotic Targets
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• Reheating neutron stars with the annihilation of self-interacting dark matter
• Tidal Deformability of Fermion-Boson Stars: Neutron Stars Admixed with Ultra-Light Dark Matter
• Bounds on Long-lived Dark Matter Mediators from Neutron Stars
• Detecting Dark Matter with Neutron Star Spectroscopy
• Tidal Love Numbers of Novel and Admixed Celestial Objects
• Gravitational Waves from Compact Dark Objects in Neutron Stars
• Hidden-Sector Modifications to Gravitational Waves From Binary Inspirals
• Investigating Dark Matter-Admixed Neutron Stars with NITR Equation of State in Light of PSR J0952-0607
• Compact Dark Objects in Neutron Star Mergers
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• Higgs portals to pulsar collapse
• Celestial Objects as Strongly-Interacting Non-Annihilating Dark Matter Detectors
• A Supersymmetric Theory of Baryogenesis and Sterile Sneutrino Dark Matter from $B$ Mesons
• R-modes as a New Probe of Dark Matter in Neutron Stars
• Feeble DM-SM Interaction via New Scalar and Vector Mediators in Rotating Neutron Stars
• Thermalization and Annihilation of Dark Matter in Neutron Stars
• Dark matter effects on the properties of neutron stars: compactness and tidal deformability
• Dark matter effects on the properties of neutron stars: optical radii
• Fermionic Light Dark Matter particles and the New Physics of Neutron Stars
• Heating neutron stars with GeV dark matter
• Evaporation Barrier for Dark Matter in Celestial Bodies
• Heating Neutron Stars with Inelastic Dark Matter and Relativistic Targets
• Dark Matter Candidates and Searches
• Probing the Impact of WIMP Dark Matter on Universal Relations, GW170817 Posterior and Radial Oscillations
• Beyond Hawking evaporation of black holes formed by dark matter in compact stars
• Gravitational waves from dark matter collapse in a star
• On the change of old neutron star masses with galactocentric distance
• Old neutron stars as probes of isospin-violating dark matter
• Continuous Gravitational Waves: A New Window to Look for Heavy Non-annihilating Dark Matter
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• Exploring non-radial oscillation modes in dark matter admixed neutron stars
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• Neutron star mass in dark matter clumps
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• Boson stars in massless and massive scalar-tensor gravity
• Circular polarization of cosmic photons due to their interactions with Sterile neutrino dark matter
• Stellar convective cores as dark matter probes
• Supramassive dark objects with neutron star origin
• Dark Freeze-out Cogenesis
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• Exploring dark sector parameters in light of neutron star temperatures
• Multi-Messenger and Cosmological Constraints on Dark Matter through Two-Fluid Neutron Star Modeling
• Neutron stars with spin polarized self-interacting dark matter
• Blocking the Hawking Radiation
• Indirect Signals of Dark Matter Can Change Depending on Where You Look
• Dark Dwarfs: Dark Matter-Powered Sub-Stellar Objects Awaiting Discovery at the Galactic Center
• Detecting Bosonic Dark Matter with Neutron Stars
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• From Capture to Collapse: Revisiting Black Hole formation by Fermionic Asymmetric Dark Matter in Neutron Stars
• Imprints of Non-Symmetric Dark Matter Halos on Magnetars: A Two-Fluid Perspective
• Matter environments around black holes: geodesics, light rings, and ultracompact configurations
• Dark matter scattering in astrophysical media: collective effects
• Impact of Sub-MeV Dark Matter on the Cooling of Pulsating White Dwarfs
• Dark, deep, deconfining: Phase transitions in neutron stars as powerful probes of hidden sectors
• Strongly Interacting Dark Matter admixed Neutron Stars