New Technologies for Next-Generation Gravitational-Wave Detectors

Since the first detection of gravitational waves in 2015 and the multi-messenger observation of a binary neutron star merger in 2017, gravitational-wave (GW) astronomy has advanced rapidly, delivering groundbreaking discoveries in astrophysics, cosmology, and fundamental physics. The international GW network—LIGO, Virgo, and KAGRA—has detected over 200 sources, with ongoing upgrades to enhance sensitivity and astrophysical reach.Future next-generation observatories, including the Einstein Telescope in Europe and Cosmic Explorer in the U.S., are set to begin operations beyond 2035. The Einstein Telescope will detect hundreds of thousands of compact-object mergers up to redshifts of a few tens, enabling precise measurements of the Hubble constant (H₀) and dark energy parameters, searches for dark matter candidates, new GW sources like spinning neutron stars and supernovae, and detailed mapping of compact-object mass distributions. Multi-messenger observations will further enrich our understanding of the universe.The GRAVITY project fosters international collaborations on key experimental advancements for future detectors, including cryogenic techniques for thermal noise reduction, quantum noise suppression, and fused-silica-based suspensions. It will also focus on detector characterization, glitch identification, advanced data-analysis algorithms, and interdisciplinary data interpretation.A crucial aspect is the transfer of knowledge to private companies, driving innovation in precision optics, quantum technologies, and advanced materials. These collaborations will enhance detector performance and create broader technological applications, benefiting both science and industry.Gravitational-wave science, bridging classical physics, general relativity, and quantum mechanics, is also a powerful tool for outreach and education. Alongside cutting-edge research, GRAVITY will engage in educational initiatives and public outreach to inspire future generations.