Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 19: Gravitational Waves I

T 19.7: Vortrag

Montag, 16. März 2026, 17:45–18:00, KS 00.005

Towards a more realistic Seismometer Position Optimization for Newtonian Noise Mitigation 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. To predict the Newtonian noise, an array of seismometers will be installed around the interferometer 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. Until now, optimizations were based on a simplifed, analytical model of the seismic wave field. In this talk, I introduce a simulation of seismic waves that allows to lift several assumptions of this model. It provides a stepstone towards more complex site-specific geological models to be used for seismometer position optimization.

Keywords: Einstein Telescope; Newtonian noise; simulation; seismometer array; optimization