Speaker
Marc Kamionkowski
(Johns Hopkins University)
Description
Gravitational waves induce correlations in pulse-arrival times characterized by the well-known Hellings-Downs curve. If, however, there are spin-0 or spin-1 gravitational-wave modes, which may arise in alternative-gravity theories, and/or anisotropies in the gravitational-wave background, there may be different patterns of correlations. I will describe an elegant (at least I think so) mathematical formalism for characterizing and rapidly calculating these correlations. The formalism also generalizes to angular-deflection correlations sought in astrometric searches for gravitational waves.
