Vector field dark matter search with Sagnac interferometer
Abstract
We present the first calculation showing that a material-asymmetric Sagnac speed meter can improve quantum-noise-limited sensitivity to B−L vector dark matter by nearly two orders of magnitude over a Fabry--Perot Michelson position meter at the low-mass end of the band. We introduce material contrast into a dual-ring interferometer to probe composition-dependent B−L forces and compare the two configurations at equal incident power, input-mirror transmissivity, and cavity round-trip length. For sapphire mirrors and a one-week benchmark, the quantum-noise-only median expected 95% CL upper limit reaches 1.2×10−27 at mA=4.1×10−14 eV/c2 (10 Hz), a factor-$57$ improvement. This band-edge forecast assumes negligible classical noise; sensitivity at 10 Hz is not established for a realizable suspension and isolation system. The material-induced displacement is essentially identical in both configurations, with the gain arising from reduced low-frequency quantum backaction. These results identify speed-meter readout as a promising route to lower-mass vector-dark-matter searches.
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BibTeX
@misc{inoue2026vector,
title = {{Vector field dark matter search with Sagnac interferometer}},
author = {Yuki Inoue and Quynh Lan Nguyen and Ippei Obata},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.04626},
eprint = {2610.04626},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.04626},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Vector field dark matter search with Sagnac interferometer
AU - Yuki Inoue
AU - Quynh Lan Nguyen
AU - Ippei Obata
PY - 2026
DA - 2026/10/14
PB - arXiv
DO - 10.48550/arxiv.2610.04626
UR - https://arxiv.org/abs/2610.04626
AB - We present the first calculation showing that a material-asymmetric Sagnac speed meter can improve quantum-noise-limited sensitivity to B−L vector dark matter by nearly two orders of magnitude over a Fabry--Perot Michelson position meter at the low-mass end of the band. We introduce material contrast into a dual-ring interferometer to probe composition-dependent B−L forces and compare the two configurations at equal incident power, input-mirror transmissivity, and cavity round-trip length. For sapphire mirrors and a one-week benchmark, the quantum-noise-only median expected 95% CL upper limit reaches 1.2×10^−27 at m_A=4.1×10^−14 eV/c^2 (10 Hz), a factor-$57$ improvement. This band-edge forecast assumes negligible classical noise; sensitivity at 10 Hz is not established for a realizable suspension and isolation system. The material-induced displacement is essentially identical in both configurations, with the gain arising from reduced low-frequency quantum backaction. These results identify speed-meter readout as a promising route to lower-mass vector-dark-matter searches.
ER -