Speaker
Description
The nonlinear matter power spectrum is the basic statistic in cosmological analysis. However, the theoretical prediction with percent-level accuracy is only from the expansive numerical simulation, which is feasible in the likelihood analysis. The solution is to construct an emulator using a finite number of simulations in a given parameter space. However, most emulators cannot cover the posterior of recent DESI BAO+CMB constraints at the w0-wa plane. In this talk, we discuss a spectra equivalence method to extend the usable range of the original CSST Emulator for dynamic dark energy models. Simulations with five different cosmologies, located within the DESI DR2+CMB constraint ellipse, are used to validate the accuracy of this method. The accuracy of the CSST Emulator still lies within 1% in the broad extended parameter range.
