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Beginning of Universe through large field hybrid inflation
| Title: | Beginning of Universe through large field hybrid inflation |
| Authors: | Kobayashi, Tatsuo Browse this author →KAKEN DB | | Seto, Osamu Browse this author →KAKEN DB |
| Keywords: | Inflationary Universe |
| Issue Date: | 10-Jul-2015 |
| Publisher: | World Scientific Publishing |
| Journal Title: | Modern Physics Letters A |
| Volume: | 30 |
| Issue: | 21 |
| Start Page: | 1550106 |
| Publisher DOI: | 10.1142/S0217732315501060 |
| Abstract: | Recent detection of B-mode polarization induced from tensor perturbations by the BICEP2 experiment implies the so-called large field inflation, where an inflaton field takes super-Planckian expectation value during inflation, at a high energy scale. We show however, if another inflation follows hybrid inflation, the hybrid inflation can generate a large tensor perturbation with not super-Planckian but Planckian field value. This scenario would relax the tension between BICEP2 and Planck concerning the tensor-to-scalar ratio, because a negative large running can also be obtained for a certain number of e-fold of the hybrid inflation. A natural interpretation of a large gravitational wave mode with or without the scalar spectral running might be multiple inflation in the early Universe. |
| Rights: | Electronic version of an article published as Modern Physics Letters A, Volume 30, Issue 21, 2015, 1550106 (11 pages) DOI: 10.1142/S0217732315501060 © copyright World Scientific Publishing Company http://www.worldscientific.com/worldscinet/mpla |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/62383 |
| 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)
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Submitter: 小林 達夫
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