Arthur-George Suvorov (Tübingen University, Germany)

The era of gravitational-wave astronomy is well underway as LVK has detected of order 400 binary merger events to date. Another type of signal that is hoped to be detected in the near future involves continuous emissions: neutron stars can be deformed away from spherical symmetry through many mechanisms, and, provided such deformations are not aligned with the rotational axis, and continuously emit. I will give an overview of some of the different mechanisms and the latest limits for a number of sources. Importantly, many candidate sources reside in populated Galactic regions (e.g. globular clusters) because accretion torques can spin the stars up and push them into the LIGO band. This invites the interesting possibility that GWs may be sporadically lensed as other stars come close to the line of sight. Borrowing techniques from the so-called Picard-Lefschetz theory, I will show how to efficiently compute lensed waveforms and how this may skew parameter estimates in the future.