Atmospheric noise contribution to Newtonian Noise for gravitational wave detectors

Third-generation gravitational-wave detectors are expected to have a sensitivity and a frequency bandwidth significantly larger than their predecessors. As a consequence, the atmospheric turbulence contribution to Newtonian noise (NN) could become substantial. In this work, we present
results about the atmospheric NN signal obtained using realistic turbulence models. Moreover, we compare the computed NN spectral density with the Einstein Telescope sensitivity curve with the xylophone design. We find that the signal decreases exponentially for small values of the frequency and the detector’s depth, while it shows a power-law behavior for sufficiently large values of these parameters. We also show that, when the detector is built on the earth’s surface, the NN signal is above the minimum sensitivity of the instrument. Despite the noise being attenuated when the detector is built underground, passive suppression may be insufficient in strong-wind situations.