Type-II seesaw leptogenesis along the Ridge

被引：0

作者：

Han, Chengcheng ^{[1
,2
]}

Lei, Zhanhong ^{[1
]}

Yang, Jin Min ^{[3
,4
]}

机构：

[1] Sun Yat Sen Univ, Sch Phys, Guangzhou 510275, Peoples R China

[2] Asia Pacific Ctr Theoret Phys, Pohang 37673, South Korea

[3] Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China

[4] Henan Normal Univ, Dept Phys, Xinxiang 453007, Peoples R China

来源：

PHYSICS OF THE DARK UNIVERSE | 2025年 / 49卷

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

Inflation; Leptogenesis; Type-II seesaw; Non-Gaussianity; NEUTRINO MASSES; CHAOTIC INFLATION; BARYOGENESIS; MODELS; MIXINGS; TRIPLET;

D O I：

10.1016/j.dark.2025.101960

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Type-II seesaw leptogenesis is a model that integrates inflation, baryon number asymmetry, and neutrino mass simultaneously. It employs the Affleck-Dine mechanism to generate lepton asymmetry, with the Higgs bosons serving as the inflaton. Previous studies assumed inflation to occur in a valley of the potential, employing the single-field approximation. In this work, we explore an alternative scenario for the type-II seesaw leptogenesis, where the inflation takes place along a ridge of the potential. Firstly, we conduct a comprehensive numerical calculation in the canonical scenario, where inflation occurs in a valley, confirming the effectiveness of the single-field approximation. Then, we introduce a novel scenario wherein inflation initiates along the potential's ridge and transitions to the valley in the late stages. In this case, the single-field inflation approximation is no longer valid, yet leptogenesis is still successfully achieved, and the generated isocurvature is well below the constraint from CMB observations. We find that this scenario can generate a sizable non-Gaussianity signatures, offering testable predictions for future experiments.

引用

页数：10

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