Angular control noise in Advanced Virgo and implications for the Einstein Telescope

• DOI: 10.48550/arxiv.2401.13013
• Publication Date: 2024-01-01
• Authors: R. Maggiore; Paolo Ruggi; A. Freise; Daniel Brown; J. W. Perry; E. N. Tapia San M...; C. M. Mow–Lowry; M. Mantovani; Julia Casanueva Diaz; D. Bersanetti; M. Tacca
• Keywords: Einstein Telescope

With significantly improved sensitivity, the Einstein Telescope (ET), along with other upcoming gravitational wave detectors, will mark beginning of precision astronomy. However, pursuit surpassing current detector capabilities requires careful consideration technical constraints inherent in existing designs. The significant improvement ET lies low-frequency range, where it anticipates a one million-fold increase sensitivity compared to detectors. Angular control noise is primary limitation for LIGO detectors this frequency originating from need maintain optical alignment. Given expected improvements ET's precise assessment angular becomes crucial achieving target sensitivity. To address this, we developed model system Advanced Virgo, closely matching experimental data and providing robust foundation modeling future-generation Our model, first time, enables replication measured coupling level between angle length. Additionally, our findings confirm that unlike LIGO, not constrained by alignment noise, even if were operating at full power.