Prospects for Direct Detection of Ultralight Dark Matter candidates in deci-Hz Band with IndIGO-D

[2608.15240] Prospects for Direct Detection of Ultralight Dark Matter candidates in deci-Hz Band with IndIGO-D Skip to main content Search Submit Donate Log in Search arXiv Press Enter to search · Advanced search Astrophysics > Cosmology and Nongalactic Astrophysics arXiv:2608.15240 (astro-ph) [Submitted on 15 Aug 2026] Title: Prospects for Direct Detection of Ultralight Dark Matter candidates in deci-Hz Band with IndIGO-D Authors: Md. Emanuel Hoque , Andrew L. Miller , Arunava Mukherjee View a PDF of the paper titled Prospects for Direct Detection of Ultralight Dark Matter candidates in deci-Hz Band with IndIGO-D, by Md. Emanuel Hoque and 1 other authors View PDF HTML (experimental) Abstract: We investigate the sensitivity of IndIGO-D, a proposed space-based decihertz gravitational-wave interferometer, to different classes of ultralight dark matter. IndIGO-D will probe the $\sim0.01$--$10~\mathrm{Hz}$ frequency band between those accessible to current ground- and future space-based gravitational-wave interferometers, providing access to ultralight dark-matter masses beyond the reach of existing instruments. We consider two complementary signatures: interferometric displacements induced by coherently oscillating scalar (dilaton), vector (dark-photon, $U(1)_B$ and $U(1)_{B-L}$ gauge groups), and tensor fields with masses $m_{\rm DM}\sim10^{-17}$--$10^{-14}~\mathrm{eV}$; and changes in laser polarization induced by pseudoscalar axion dark matter at higher masses, around $m_a\sim10^{-12}~\mathrm{eV}$. For the dilatons, dark photons and tensors, we compute the expected sensitivities using two pipelines -- cross-correlation and BSD excess-power -- assuming L-shaped and triangular interferometer layouts and three representative noise power spectral densities (S1, S2, S3), each for two years of continuous observation. We find that the projected sensitivities agree to within a factor of order unity across the search pipelines and interferometer geometries. In particular, we show that IndIGO-D could open previously unconstrained coupling parameter space for vector and tensor dark matter across $m_{\rm DM}\sim10^{-16}$--$10^{-14}~\mathrm{eV}$, bridging the sensitivity of space- and ground-based experiments. For axion dark matter, we demonstrate that a complementary detection for laser light polarization shifts, limited primarily by photon shot noise, could probe the axion-photon coupling $g_{a\gamma}$ at masses around $m_a\sim10^{-12}~\mathrm{eV}$ at a level potentially better than that of other future experiments without degrading sensitivity to gravitational waves. Comments: 18 pages, 5 figures Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO) ; General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Experiment (hep-ex); High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th) Cite as: arXiv:2608.15240 [astro-ph.CO] (or arXiv:2608.15240v1 [astro-ph.CO] for this version) https://doi.org/10.48550/arXiv.2608.15240 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Arunava Mukherjee [ view email ] [v1] Sat, 15 Aug 2026 13:58:41 UTC (356 KB) Full-text links: Access Paper: View a PDF of the paper titled Prospects for Direct Detection of Ultralight Dark Matter candidates in deci-Hz Band with IndIGO-D, by Md. Emanuel Hoque and 1 other authors View PDF HTML (experimental) TeX Source view license Current browse context: astro-ph.CO < prev | next > new | recent | 2026-08 Change to browse by: astro-ph gr-qc hep-ex hep-ph hep-th References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... 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