Speaker
Description
Discovering primordial parity violation would have profound implications for our understanding of early Universe physics and would greatly inform inflationary models. Tantalizing evidence of cosmic parity violation in the four-point statistics of galaxy clustering is currently inconclusive due to uncertainty in observational systematics and covariance estimation. The covariance is challenging to estimate because of the high dimensionality of the trispectrum. In this talk, I will present a new class of observables for cosmological signatures of parity violation. These observables are parity-odd power-spectrum-like statistics (POP spectra) that are compressions of the six-dimensional trispectrum down to one-dimensional power spectra. They are much faster to implement and easier to analyze and estimate their covariance compared to the full four-point statistics. We illustrate the signal and sensitivity of our POP spectra using simulated data of a primordial potential with a specific parity-odd trispectrum. Additionally, we provide theoretical calculations that agree well with the numerical simulation results.
