Speaker
Description
The newest generation of galaxy surveys are ushering in an era of precision large-scale structure cosmology, making a rigorous full-sky treatment of galaxy clustering useful and essential. In this talk, I present a framework for computing the angular power spectrum of galaxies on the full sky which incorporates all linear order relativistic effects that become significant on ultra-large scales. These corrections are necessary to ensure an accurate detection of local-type primordial non-Gaussianity (PNG), which manifests itself on these horizon scales via a characteristic scale-dependent bias. I will discuss the effect of ignoring relativistic effects on cosmological parameters, including $f_\text{NL}$, and apply it to a SPHEREx forecast. Additionally, I will predict dynamical and geometrical dark energy constraints from SPHEREx. Looking beyond the power spectrum, I may also present the leading order angular bispectrum, accounting for second order relativistic light-cone effects. Together, these results represent a powerful and self-consistent tool for extracting PNG and relativistic signatures from the newest-generation of galaxy surveys, such as SPHEREx.