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GR: Fachverband Gravitation und Relativitätstheorie

GR 8: GW III

GR 8.4: Vortrag

Mittwoch, 2. April 2025, 14:30–14:50, ZHG007

Fighting Gravity Gradient Noise with Gradient-Based Optimization at the Einstein Telescope — •Patrick Schillings and Johannes Erdmann — III. Physikalisches Institut A, RWTH Aachen University

The Einstein Telescope is a third-generation, underground gravitational wave detector that will allow us to measure gravitational waves with significantly improved precision. Its 'xylophone' arrangement is designed to extend the frequency range down to a few Hertz. To improve the sensitivity of the low-frequency interferometer, one needs to mitigate the gravitational effect of density fluctuations in the surrounding rock caused by seismic activity, which result in so-called Newtonian noise in the detector. To achieve that, an array of seismometers will be installed around the mirrors. Expensive boreholes will have to be drilled in order to place these seismometers, which will limit the total number of seismometers that can be placed for a given budget. Therefore, the available resources should be used optimally in terms of predicting the Newtonian noise from the seismometer data. This talk will focus on a differential approach to this optimization problem, which leads to an improvement in terms of noise reduction and runtime compared to methods that were used before.

Keywords: Einstein Telescope; gravitational wave; seismometer; differential optimization; Newtonian noise