Tidal Properties of White Dwarfs Admixed with Fermionic Dark Matter
Abstract
This study investigates the impact of fermionic dark matter (DM) on the structural and tidal properties of white dwarfs (WDs). Using a two-fluid general relativistic framework, we model stars with fixed DM mass fractions (${\rm MF}=M_{\rm DM}/M_{\rm NM} $), ranging from 0\% to 8\%, with zero representing the no DM scenario. Our results indicate that DM accumulation leads to a significant compactification of the star, reflected in increased surface gravity and compactness. Furthermore, we calculate the second-order tidal Love number k2 and the dimensionless tidal deformability Λ. For some total mass range, we find that the presence of DM significantly reduces Λ, suggesting that DM-admixed WDs (DMWDs) are less susceptible to tidal deformations. These structural shifts alter the gravitational wave signatures in binary systems, potentially providing a new window for DM detection with future instruments like LISA.
Related
- Two-Fluid Radial Stability of Dark-Matter-Admixed Compact Objects: Dark Compact Planets, Dark White Dwarfs, Dark Neutron Stars, and Dark Oysters
- Slowly rotating white dwarfs in f (R, T ) = R + 2λT gravity: structure and stationary tidal response
- Bayesian exploration of weakly interacting models of dark matter admixed neutron stars based on multi-density constraints
- A self-consistent single-fluid framework for neutron stars admixed with mirror dark matter
- Radii and Scaling Relations of Dark-Matter-Admixed Neutron Stars
BibTeX
@misc{carvalho2026tidal,
title = {{Tidal Properties of White Dwarfs Admixed with Fermionic Dark Matter}},
author = {G. A. Carvalho and J. D. V. Arbañil and I. A. Lacerda and J. G. Coelho},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.17850},
eprint = {2609.17850},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.17850},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Tidal Properties of White Dwarfs Admixed with Fermionic Dark Matter
AU - G. A. Carvalho
AU - J. D. V. Arbañil
AU - I. A. Lacerda
AU - J. G. Coelho
PY - 2026
DA - 2026/09/15
PB - arXiv
DO - 10.48550/arxiv.2609.17850
UR - https://arxiv.org/abs/2609.17850
AB - This study investigates the impact of fermionic dark matter (DM) on the structural and tidal properties of white dwarfs (WDs). Using a two-fluid general relativistic framework, we model stars with fixed DM mass fractions (${\rm MF}=M_{\rm DM}/M_{\rm NM} $), ranging from 0\% to 8\%, with zero representing the no DM scenario. Our results indicate that DM accumulation leads to a significant compactification of the star, reflected in increased surface gravity and compactness. Furthermore, we calculate the second-order tidal Love number k_2 and the dimensionless tidal deformability Λ. For some total mass range, we find that the presence of DM significantly reduces Λ, suggesting that DM-admixed WDs (DMWDs) are less susceptible to tidal deformations. These structural shifts alter the gravitational wave signatures in binary systems, potentially providing a new window for DM detection with future instruments like LISA.
ER -