Peculiar-velocity cosmology with Types Ia and II supernovae

We present the Democratic Samples of Supernovae (DSS), a compilation 775 low-redshift Type Ia and II supernovae (SNe & II), which 137 SN distances are derived via newly developed snapshot distance method. Using objects in DSS as tracers peculiar-velocity field, we compare against corresponding reconstruction from 2M++ galaxy redshift survey. Our analysis -- takes special care to properly weight each subcatalogue cross-calibrate relative scales between them results measurement cosmological parameter combination $f\sigma_8 = 0.390_{-0.022}^{+0.022}$ well an external bulk flow velocity $195_{-23}^{+22}$ km s$^{-1}$ direction $(\ell, b) (292_{-7}^{+7}, -6_{-4}^{+5})$ deg, originates beyond reconstruction. Similarly, find $245_{-31}^{+32}$ toward (294_{-7}^{+7}, 3_{-5}^{+6})$ deg on scale $\sim 30 h^{-1}$ Mpc if ignore reconstructed field altogether. constraint $f\sigma_8$ tightest SNe date (considering only statistical error bars), one utilise is broadly consistent with other literature. intend for our data accumulation treatment techniques become prototype future studies that will exploit unprecedented volume upcoming wide-field surveys.