Quantum tunneling and spontaneous baryogenesis in the relaxion model
Abstract/Contents
- Abstract
- The Cosmological Relaxation mechanism is proposed as an alternative solution to the Electroweak Hierarchy Problem, where the mass of the Higgs boson is dynamically relaxed to its current value of 125 GeV through its interaction with the relaxion -- a hypothetical scalar particle which lies beyond the Standard Model -- in the early universe. So far, many of the theoretical implications of this model remain to be investigated. In this work we present the analytic calculations of quantum tunneling rate of the relaxion in a corrugated potential with growing sinusoidal barriers. We find that the tunneling rate is parametrically suppressed so that quantum tunneling effectively stops shortly after the electroweak phase transition. We also derive the baryon-to-entropy ratio generated by spontaneous baryogenesis from the slow-roll of the relaxion along its potential after reheating. We find that the minimal QCD relaxion model generates slightly insufficient baryon asymmetry and discuss several approaches to improve its agreement with the experimental values.
Description
| Type of resource | text |
|---|---|
| Date created | May 22, 2017 |
Creators/Contributors
| Author | Xu, Qingyang |
|---|---|
| Degree granting institution | Stanford University, Department of Physics |
| Primary advisor | Graham, Peter |
| Advisor | Dimopoulos, Savas |
Subjects
| Subject | quantum tunneling |
|---|---|
| Subject | relaxion |
| Subject | baryogenesis |
| Subject | cosmological relaxation |
| Subject | electroweak hierarchy |
| Genre | Thesis |
Bibliographic information
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- User agrees that, where applicable, content will not be used to identify or to otherwise infringe the privacy or confidentiality rights of individuals. Content distributed via the Stanford Digital Repository may be subject to additional license and use restrictions applied by the depositor.
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
Preferred citation
- Preferred Citation
- Xu, Qingyang. (2017). Quantum tunneling and spontaneous baryogenesis in the relaxion model. Stanford Digital Repository. Available at: https://purl.stanford.edu/nv519tg2534
Collection
Undergraduate Theses, Department of Physics
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- Contact
- youngxu@stanford.edu
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