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(Seminar) Primordial black holes from scalaron in R^2 gravity
2018-02-06  【 】【打印】【关闭

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

 

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