STRONG LENSING OF GRAVITATIONAL WAVES - NEW OPPORTUNITIES FOR MULTIMESSENGER ASTRONOMY

We have entered the era of gravitational wave astronomy with routine detections of GW signals by the LIGO-Virgo-KAGRA interferometric detectors. Future perspectives are bright with the new generations of GW detectors: ground-based - Einstein Telescope and Cosmic Explorer or space-borne - LISA, DECIGO, BBO. Gravitational waves travelling along null geodesics can undergo strong gravitational lensing like electromagnetic waves do. Hence, strong lensing of gravitational waves is becoming a popular research topic. In this contribution, I concisely review the state-of-the-art in this subject and present new opportunities opening for the multimessenger astronomy from detections of lensed GW signals.