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Axion-driven hybrid inflation over a barrier
- Title
- Axion-driven hybrid inflation over a barrier
- Authors
- Gong, Jinn-Ouk; Jeong, Kwang Sik
- Ewha Authors
- 공진욱
- SCOPUS Author ID
- 공진욱
- Issue Date
- 2021
- Journal Title
- PHYSICAL REVIEW D
- ISSN
- 2470-0010
2470-0029
- Citation
- PHYSICAL REVIEW D vol. 104, no. 4
- Publisher
- AMER PHYSICAL SOC
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- We present a novel cosmological scenario that describes both inflation and dark matter. A concrete realization of our scenario is given based on a well-established particle physics model, where an axionlike field drives inflation until a potential barrier, which keeps a waterfall field at the origin, disappears to trigger a waterfall transition. Such a barrier makes the inflaton potential much flatter, improving significantly the naturalness and viability of the otherwise problematic setup adopted previously. The observed spectrum of the cosmic microwave background indicates that the inflationary Hubble scale, which is allowed to span a wide range, uniquely fixes the inflaton mass and decay constant. This raises an intriguing possibility of probing inflation via experimental searches for axionlike particles. Further, our model involves dark matter candidates including the inflaton itself. Also, for a complex waterfall field, we can determine cosmologically the Peccei-Quinn scale associated with the strong CP problem.
- DOI
- 10.1103/PhysRevD.104.043511
- Appears in Collections:
- 사범대학 > 과학교육과 > Journal papers
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