期刊
PHYSICS LETTERS B
卷 738, 期 -, 页码 301-304出版社
ELSEVIER
DOI: 10.1016/j.physletb.2014.09.061
关键词
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资金
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan [24740151, 25105011]
- Japan Society for the Promotion of Science (JSPS) [26287039]
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- JSPS
- Grants-in-Aid for Scientific Research [12J06240, 24740151, 25105011] Funding Source: KAKEN
The observation of the B-mode in the cosmic microwave background radiation combined with the so-called Lyth bound suggests the trans-Planckian variation of the inflaton field during inflation. Such a large variation generates concerns over inflation models in terms of the effective field theory below the Planck scale. If the inflaton resides in a Riemann surface and the inflaton potential is a multivalued function of the inflaton field when it is viewed as a function on a complex plane, the Lyth bound can be satisfied while keeping field values in the effective field theory within the Planck scale. We show that a multivalued inflaton potential can be realized starting from a single-valued Lagrangian of the effective field theory below the Planck scale. (C) 2014 The Authors. Published by Elsevier B.V.
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