Speaker
Zhaohui Xu
(University of Maryland, College Park)
Description
We study the one-loop model of a pair of charged scalars with chemical potential mechanism in cosmological collider physics. We evaluate the one-loop amplitude analytically using spectral decomposition in de Sitter. Compared to previous analysis, our result predicts the correct power dependence on scalar masses and the chemical potential for both the signal and the background. Using these results, we further demonstrate that a signal strength $f_{\mathrm{NL}} \sim \mathcal{O}(0.01-0.1)$ can be obtained in the bispectrum within perturbative regime, which is potentially reachable by the $21\:\text{cm}$ tomography.
Authors
Arushi Bodas
Edward Broadberry
(University of Maryland, College Park)
Raman Sundrum
Zhaohui Xu
(University of Maryland, College Park)
