|
Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
Peer-reviewed Journal Articles, etc >
Relaxion window
| Title: | Relaxion window |
| Authors: | Kobayashi, Tatsuo Browse this author →KAKEN DB | | Seto, Osamu Browse this author →KAKEN DB | | Shimomura, Takashi Browse this author | | Urakawa, Yuko Browse this author |
| Keywords: | Relaxion | | phenomenological constraints | | early Universe |
| Issue Date: | 7-Sep-2017 |
| Publisher: | World Scientific Publishing |
| Journal Title: | Modern Physics Letters A |
| Volume: | 32 |
| Issue: | 27 |
| Start Page: | 1750142 |
| Publisher DOI: | 10.1142/S0217732317501425 |
| Abstract: | We investigate cosmological constraints on the original relaxion scenario proposed by Graham, Kaplan and Rajendran. We first discuss the appropriate sign choice of the terms in the scalar potential, when the QCD axion is the relaxion with a relaxion-inflaton coupling proposed in the original paper. We next derive the cosmologically consistent ranges of the mass and a coupling of the relaxion for both the QCD relaxion and non-QCD relaxion. The mass range is obtained by 10(-5) eV << m(phi) less than or similar to 10(4) eV. We also find that a strong correlation between the Hubble parameter at the relaxion stabilization and the scale A of non-QCD strong dynamics, which generates the non-perturbative relaxion cosine potential. For a higher relaxion mass, a large scale A becomes available. However, for its lower mass, A should be small and constructing such a particle physics model is challenging. |
| Rights: | Electronic version of an article published as Mod. Phys. Lett. A 32(27), 1750142, 2017, DOI:10.1142/S0217732317501425 © copyright World Scientific Publishing Company http://www.worldscientific.com/worldscinet/mpla |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/71447 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
|
Submitter: 小林 達夫
|
