Programme

P.44 -- Posters, VCTP-50

Date: Tuesday, 5 August 2025

Time: 08:30 - 10:00

\texttt{Darksuite}: an Algorithm for Dark-Matter Admixed Neutron Stars

Nguyen Thi Lan Anh (1), Peter Lott (1), Nguyen Quynh Lan (1)

(1) Phenikaa University

Gravitational-wave observations provide a unique window into the fundamental nature of massive objects. In particular, neutron star equations of state have been constrained due to the success of gravitational wave observatories. Recently, the possibility of detecting dark matter admixed neutron stars via ground-based laser interferometry has been explored. Dark matter would impact the gravitational waveform of an inspiraling neutron star system through tidal parameters, namely the tidal deformability ($\lambda$), incurring a phase shift to the frequency evolution of the signal. The phase shift depends both on the percentage of dark matter within the star and its particle nature, e.g. bosonic or fermionic. If detected, indirect detection of dark matter through admixture within neutron stars can provide insight into the neutron equation of state, as well as constraints on the density of dark matter in the universe. In this paper, we introduce \texttt{Darksuite}, a proposed extension of \texttt{LALSuite} aimed at incorporating light dark matter effects into gravitational waveform models. This framework employs simulations from the two-fluid, generally relativistic Tolman-Oppenheimer-Volkoff equations, wherein one fluid is ordinary nuclear matter and the other is dark matter. We demonstrate interpolation of values from a bank of simulations, enabling the study of binary systems where at least one component may be a dark-matter-admixed neutron star. By leveraging existing methodologies within \texttt{LALSuite} for tidal phase corrections and supplementing them with dark matter effects, \texttt{Darksuite} provides a means to generate and analyze gravitational waveforms for these exotic systems. In the future, we hope to systematically assess the influence of dark matter on waveform morphology, explore the detectability of these effects with current and next-generation observatories, and refine constraints on dark matter properties through gravitational wave observations.

Presenter: Nguyen Thi Lan Anh