Low-frequency noise mitigation and bandgap engineering using seismic metamaterials for terrestrial gravitational wave observatories

Abstract Gravitational-wave now became one of the important observational methods for studying Universe since its first detection. However, ground-based observatories have an inherent barrier to their detection frequency band due seismic and gravity gradient noises nearby perturbation surroundings. A recent intriguing development artificial structures media called metamaterial is opening a new branch wave mechanics application in various fields, particular, suggesting novel way mitigating by controlling structure propagating waves. In this paper, we propose framework handling gravitational detectors using under media. Specifically, suggest bandgap engineering technique underground effects acoustic resulting from vibration KAGRA observatory. Subject Index metamaterial, engineering, noise reduction