We present results obtained from a finite-element simulation of seismic displacement fields and of gravity gradients generated by those fields. The displacement field is constructed by a plane wave model with a 3D isotropic stochastic field and a 2D fundamental Rayleigh field. The plane wave model provides an accurate representation of stationary fields from distant sources. Underground gravity gradients are calculated as acceleration of a free test mass inside a cavity. The results are discussed in the context of gravity-gradient noise subtraction in third generation gravitational-wave detectors. Error analysis with respect to the density of the simulated grid leads to a derivation of an improved seismometer placement inside a 3D array which would be used in practice to monitor the seismic field.
Response of the underground environment of the KAGRA observatory against the air-pressure disturbance from the Tonga volcano eruption on January 15th, 2022
Prospects for Observing Gravity-gradient Noise and Earthquake Gravity Signals with CHRONOS
National Institute of Physics, University of the Philippines - Diliman（菲律宾大学迪里曼分校国家物理研究所）；Center for High Energy and High Field (CHiP), National Central University（国立中央大学高能高场中心）；Institute of Physics, Academia Sinica（中央研究院物理研究所）；Institute of Particle and Nuclear Studies, High Energy Acceleration Research Organization (KEK)（高能加速器研究机构粒子与核研究部）
Gravity Wave and Neutrino Bursts from Stellar Collapse: A Sensitive Test of Neutrino Masses
提出了新的方法，目的是确定绝对中微子质量的中微子爆发和引力波在恒星坍缩过程中发出的同时观测。结果表明，中子化电子中微子闪光和引力波信号的最大振幅与核坍缩结束时发生的反弹在优于1 ms的时间尺度上是紧密同步的。和重力波天线即将运作（LIGO，Virgo，.）在探测银河系超新星和利用所提出的方法方面，它们的性能非常匹配。描述了几种方法，适用于不同的情况下，取决于中微子混合。鉴于目前对中微子振荡的了解，所提出的方法对中微子基本上是质量简并的质量范围是敏感的。95% C. L.可以达到的上限从大电子中微子存活概率的0.75eV/c2变化到实际上所有电子中微子都转换成μ子或τ中微子时的1.1eV/c2。灵敏度几乎与超新星距离无关。
