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arXiv · 2607.15683

Torsional-X Seismometer for Lunar Decihertz Gravitational-Wave Detection

Yulin Xia·Denis Martynov·Huan Yang·Haixing Miao
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Abstract

The lunar gravitational-wave antenna concept uses the Moon as a resonant detector instrumented with precision seismometers, targeting the decihertz band between ground- and space-based observatories. We propose a compact monolithic fused-silica torsional-X seismometer that re-engineers garden-gate acceleration-to-rotation transduction for this regime through a high-tension dual-fiber suspension. Its designed millihertz-scale resonance and ultra-low mechanical dissipation enable a nearly order-of-magnitude improvement around $0.1\,\mathrm{Hz}$ compared with existing lunar seismometer concepts. Achieving this performance requires room-temperature operation, where fused-silica exhibits low mechanical loss, together with subdominant actuation noise. We demonstrate a room-temperature vacuum prototype validating the operating principle and core mechanical design, and derive requirements for a future lunar implementation capable of approaching the target sensitivity.

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Yulin Xia, Denis Martynov, Huan Yang, Haixing Miao. 2026-07-17. Torsional-X Seismometer for Lunar Decihertz Gravitational-Wave Detection. https://arxiv.org/abs/2607.15683

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