Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 60: Gravitational Waves

T 60.6: Vortrag

Mittwoch, 2. April 2025, 17:30–17:45, VG 3.104

Cavern Geometry Effects in Newtonian Noise at the Einstein Telescope — •Valentin Tempel, Markus Bachlechner, David Bertram, and Achim Stahl — III. Physikalisches Institut B, RWTH Aachen University

The Einstein Telescope (ET) is a proposed third-generation gravitational wave detector designed to surpass the sensitivity of current interferometers like LIGO and Virgo by at least an order of magnitude. This enhanced sensitivity will enable the detection of fainter gravitational waves and provide new insights into astrophysical phenomena. One of the major challenges in achieving the desired sensitivity is Newtonian Noise (NN), which dominates the expected noise budget of ET in the frequency range of 1 Hz to 5 Hz. NN arises from density fluctuations in the rock surrounding the cavern walls, leading to fluctuating gravitational forces on the mirrors. This talk presents the impact of cavern geometry on the coupling of seismic waves to the ET mirrors. Analytical and numerical approaches are applied to demonstrate how the size and shape of the cavern influence the coupling transfer functions.

Keywords: Einstein Telescope; Gravitational Waves; Gravity Gradient Noise; Newtonian Noise