| Abstract: |
Gravitational waves (GWs) distort galaxy shapes through tidal effects, offering a novel avenue to probe the nature of gravity. However, the auto-correlation of the projected galaxy-shape field on the celestial sphere is dominated by the gravitational potential, making it difficult to isolate the helicity-2 modes of GWs. This spin-0 contribution can be removed by considering lower-rank tensors constructed from two-dimensional derivatives on the sky. In this talk, I extend this formalism to include additional GW polarization modes beyond those predicted by general relativity, and show that these extra polarizations modify both the amplitude and angular dependence of the correlation functions.
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