Probing higher-spin fields from inflation with higher-order statistics of the CMB

Bordin, Lorenzo; Cabass, Giovanni

Abstract

We investigate the degree to which the Cosmic Microwave Background (CMB) can be used to constrain primordial non-Gaussianity coming from the presence of spinning particles coupled to the inflaton. We compute the TTT and TTTT correlation functions arising from the exchange of a particle with spin s and generic mass, and the corresponding signal-to-noise ratios for a cosmic-variance-limited CMB experiment. We show that already with Planck data one could improve the theoretical bounds on the amplitude of these primordial templates by an order of magnitude. We particularly emphasize the fact that the trispectrum could be sizable even if the bispectrum is not, making it a prime observable to explore the particle content during inflation.

Citation

Bordin, L., & Cabass, G. (2019). Probing higher-spin fields from inflation with higher-order statistics of the CMB. Journal of Cosmology and Astroparticle Physics, 2019(June), https://doi.org/10.1088/1475-7516/2019/06/050

• Journal Article Type: Article
• Acceptance Date: Jun 14, 2019
• Online Publication Date: Jun 25, 2019
• Publication Date: Jun 25, 2019
• Deposit Date: Aug 2, 2019
• Publicly Available Date: Jun 26, 2020
• Journal: Journal of Cosmology and Astroparticle Physics
• Electronic ISSN: 1475-7516
• Publisher: IOP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 2019
• Issue: June
• Article Number: 050
• DOI: https://doi.org/10.1088/1475-7516/2019/06/050
• Keywords: Inflation; Non-gaussianity
• Public URL: https://nottingham-repository.worktribe.com/output/2379673
• Publisher URL: https://iopscience.iop.org/article/10.1088/1475-7516/2019/06/050
• Additional Information: This is an author-created, un-copyedited version of an article accepted for publication in Journal of Cosmology and Astroparticle Physics. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://iopscience.iop.org/article/10.1088/1475-7516/2019/06/050