Speaker
Description
The Einstein Telescope is based on a configuration of multiple interferometers with fixed geometric relations. In a triangular configuration, this enables the construction of a null stream in which gravitational-wave contributions cancel, while local disturbances remain with finite amplitude. Events appearing in the null stream can therefore be identified as noise and are excluded from astrophysical interpretation. Among the relevant disturbances is Newtonian noise (NN), which is expected to dominate the low-frequency regime. To investigate its behavior in the null stream, we use simulations to generate three-dimensional seismic fields and the corresponding NN forces acting on the test masses. We examine a broad range of NN configurations using both individual wave packets and superpositions forming complex wave fields. Our results indicate that correlated NN contributions remain visible.