Cosmological Signatures of Neutrino Seesaw Mechanism
Chengcheng Han, Hong-Jian He, Linghao Song, Jingtao You

TL;DR
This paper proposes a novel cosmological approach to detect neutrino seesaw signatures via inflaton decay modulated by Higgs fluctuations, potentially observable in large-scale structure surveys.
Contribution
It introduces a new method linking inflaton decay, Higgs modulation, and neutrino seesaw to produce measurable non-Gaussian signatures in the universe.
Findings
Large parameter space of neutrino seesaw can be probed by upcoming surveys.
Primordial non-Gaussianities provide signatures of the seesaw mechanism.
Higgs modulated reheating offers a new observational window.
Abstract
The tiny neutrino masses are most naturally explained by seesaw mechanism through singlet right-handed neutrinos, which can further explain the matter-antimatter asymmetry in the Universe. In this Letter, we propose a new approach to study cosmological signatures of neutrino seesaw through the interaction between inflaton and right-handed neutrinos that respects the shift symmetry. In our framework, after inflation the inflaton predominantly decays into right-handed neutrinos and its decay rate is modulated by the fluctuations of Higgs field that act as the source of curvature perturbations. This gives a new realization of Higgs modulated reheating, and it produces primordial non-Gaussian signatures that can be measured by the forthcoming large-scale structure surveys. We find that these surveys have the potential to probe a large portion of the neutrino seesaw parameter space, opening…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsAstrophysics and Cosmic Phenomena · Neutrino Physics Research · Dark Matter and Cosmic Phenomena
