The Einstein Telescope (ET) is the proposed European next-generation ground-based gravitational-wave observatory, included in the 2021 ESFRI Roadmap. To be built underground, two designs are under study: a 10 km triangular detector or two 15 km L-shaped detectors, both located in Europe. Each arm will contain two nested interferometers, one tuned for low frequencies and the other for high. ET will improve sensitivity by a factor of 10 over current detectors and access frequencies down to 3 Hz. It will observe gravitational waves from the early Universe and provide unprecedented precision for nearby events, revolutionizing astrophysics, fundamental physics, cosmology, and nuclear physics.
Einstein Telescope
Artistic view of the Einstein Telescope. Credits: Marco Kraan, Nikhef.