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(Seminar) Primordial black holes from scalaron in R^2 gravity
02/06
2018
- Title (Seminar) Primordial black holes from scalaron in R^2 gravity
- Speaker
- Date
- Venue
Abstract
| CAS Key Laboratory of Theoretical Physics | |||
| Institute of Theoretical Physics | |||
| Chinese Academy of Sciences | |||
| Seminar | |||
| Title 题目 | Primordial black holes from scalaron in R^2 gravity | ||
| Speaker 报告人 | Shi Pi (皮石) | ||
| Affiliation 所在单位 | Yukawa Institute for Theoretical Physics, Kyoto University | ||
| Date 日期 | 10:00am, Feb 06, 2018, Tuesday | ||
| Venue 地点 | ITP New Building 6420
| ||
| Abstract 摘要 | Primordial black holes (PBHs) may form when the primordial perturbation excesses some critical value at horizon re-entry. I will briefly review the mechanism of primordial black holes formation in the radiation dominated era, and talk about its application to a specific model of inflation in which a scalar field chi is non-minimally coupled to Starobinsky's R^2 gravity. This is equivalent to a two-field inflation of chi and the scalaron phi which couple to chi with a nontrivial field metric. Peaks on primordial density perturbation may appear at the scale that exits the horizon at the transition of two stages of inflation, while PBHs may form when it re-enters horizon, which may serve as part or all of the dark matter at some mass range 10^19 to 10^23 g, according to the recent observational constraints. | ||
| Contact person 所内联系人 | Rong-Gen Cai | ||