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Setting Limits on Supersymmetry Using Simplified Models

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Published on: November 15, 2013

Probing Leptogenesis with the Cosmological Collider.

Yanou Cui¹, Zhong-Zhi Xianyu^2,3

¹Department of Physics and Astronomy, University of California, Riverside, California 92521, USA.

Physical Review Letters

|September 26, 2022

Summary

This study proposes using cosmological collider physics to test leptogenesis. Detectable primordial non-Gaussianity during inflation could reveal crucial details about leptogenesis models.

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Area of Science:

Cosmology
Particle Physics
Astrophysics

Background:

Leptogenesis, a key mechanism for baryogenesis, is difficult to test directly due to high energy scales.
Existing methods for probing leptogenesis are limited by the extreme energies involved.

Purpose of the Study:

To propose a novel method for directly probing leptogenesis using cosmological collider physics.
To demonstrate how primordial non-Gaussianity can serve as a detectable signature of leptogenesis during inflation.

Main Methods:

Utilizing a cosmological Higgs collider as a theoretical example.
Analyzing the production of primordial non-Gaussianity during inflation within leptogenesis models.
Identifying distinctive oscillatory patterns in non-Gaussianity as informative signatures.

Main Results:

Leptogenesis models during inflation can generate detectable primordial non-Gaussianity.
The non-Gaussianity exhibits unique oscillatory patterns.
These patterns encode information about lepton-number violating couplings, Majorana right-hand neutrino masses, and CP phases.

Conclusions:

Cosmological collider physics offers a new avenue to test leptogenesis.
Primordial non-Gaussianity with oscillatory patterns provides a direct probe for leptogenesis parameters.
This approach can shed light on the fundamental physics responsible for the matter-antimatter asymmetry.