Speaker
Description
We present a hybrid Lagrangian bias expansion emulator for the upcoming China Space Station Telescope (CSST) survey. We combine the Lagrangian bias expansion and the accurate dynamical evolution from N-body simulation, to predict the power spectrum of the biased tracer in real space. We employ the Kun simulation suite to construct the emulator, emulating across the space of 8 cosmological parameters including dynamic dark energy w_0, w_a, and total neutrino mass. The sample variance due to the finite simulation box is further reduced using the Zel'dovich variance control, and it enables the precise measurement of the Lagrangian basis spectra up to the quadratic order. The emulation of basis spectra realizes 1% level accuracy, covering wavelength k < 1 h/Mpc and redshift 0 < z< 3 up to the quadratic order field.
