Intrinsic Tidal Shear at the Largest Scales: Galaxy Multiplet Alignment in DESI DR2
We measure the intrinsic alignment (IA) of galaxy multiplets with the large-scale tidal field traced by galaxy positions in DESI Data Release 2. Using the BGS, LRG, and ELG samples spanning $0.01<z<1.6$, we optimize the scales which define multiplets in each sample to minimize measurement noise. We measure multiplet ti...