Is XTE J1814-338 a dark matter-admixed neutron star?
Abstract
We explore the possibility that the ultracompact object XTE J1814-338 is a dark matter-admixed neutron star (DNS) based on a general-relativistic two-fluid approach, in which one fluid describes ordinary nuclear matter and the other dark matter. The equations of state of nuclear matter and dark matter are described by the Brueckner-Hartree-Fock (BHF) theory with realistic three-body forces and a generic bosonic self-interacting dark matter model, respectively. Based on the observational data, we determine the parameter space for XTE J1814-338 as a DNS, and find that only a halo stellar configuration with a high dark matter fraction is allowed. Furthermore, we predict other observable properties of XTE J1814-338 and provide robust lower bounds for these quantities.
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BibTeX
@misc{liu2026j1814338,
title = {{Is XTE J1814-338 a dark matter-admixed neutron star?}},
author = {Hong-Ming Liu and Peng-Cheng Chu and He Liu and Zeng-Hua Li and Xiao-Hua Li},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.41293},
eprint = {2610.41293},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.41293},
}
RIS
TY - UNPB
TI - Is XTE J1814-338 a dark matter-admixed neutron star?
AU - Hong-Ming Liu
AU - Peng-Cheng Chu
AU - He Liu
AU - Zeng-Hua Li
AU - Xiao-Hua Li
PY - 2026
DA - 2026/10/30
PB - arXiv
DO - 10.48550/arxiv.2610.41293
UR - https://arxiv.org/abs/2610.41293
AB - We explore the possibility that the ultracompact object XTE J1814-338 is a dark matter-admixed neutron star (DNS) based on a general-relativistic two-fluid approach, in which one fluid describes ordinary nuclear matter and the other dark matter. The equations of state of nuclear matter and dark matter are described by the Brueckner-Hartree-Fock (BHF) theory with realistic three-body forces and a generic bosonic self-interacting dark matter model, respectively. Based on the observational data, we determine the parameter space for XTE J1814-338 as a DNS, and find that only a halo stellar configuration with a high dark matter fraction is allowed. Furthermore, we predict other observable properties of XTE J1814-338 and provide robust lower bounds for these quantities.
ER -