Measuring cosmic filament spin with the kinetic Sunyaev–Zel’dovich effect

The spin of intergalactic filaments has been predicted from simulations, and supported by tentative evidence redshift-space filament shapes in a galaxy redshift survey: generally, is redshifted on one side its axis, blueshifted the other. Here, we investigate whether spins could have measurable kinetic Sunyaev-Zel'dovich (kSZ) signal, CMB photons being scattered moving ionised gas; this pure velocity information complementary to shapes. We propose measure kSZ dipole combining surveys with experiments. base our S/N analyses first an existing catalogue, combination Planck data. then detectability using DESI or SKA-2 next-stage find that gas halos galaxies co-rotating induce stronger signal than diffuse filamentary gas, but both signals seem too small be detected near-term such as DESI+future But future experiments give more 10$\sigma$ detection. gain comes mainly increased area overlap number filaments, also low noise high resolution are important capture sky. Successful detection may help gravitomagnetic effect large-scale structure advance understanding baryons cosmic web.