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(Seminar) bservational Signatures from Modulated Preheating
2019-03-05  【 】【打印】【关闭

CAS Key Laboratory of Theoretical Physics

Institute of Theoretical Physics

Chinese Academy of Sciences

Seminar

Title

题目

Observational Signatures from Modulated Preheating

Speaker

报告人

黄志琦

Affiliation

所在单位

中山大学物理与天文学院

Date

日期

10:00, Mar 5 (Tuesday), 2019
 

Venue

地点

五分彩APPRoom 6420, ITP NEW BUILDING

Abstract

摘要

五分彩APPAfter early-universe inflation, the inflaton decays into other fields via a reheating process. If the decay begins with a preheating stage, where the fluctuations of coupled fields are exponentially excited by parametric resonance, the energy transfer can be much more efficient and possibly producing observable signatures to reveal exciting new physics beyond the standard model. In 2009 my collaborators and I proposed that, if the equation of the state of the multi-field system is modulated by the background field values, large-scale metric fluctuations can indeed be generated from the modulated preheating process. Continuing on this topic, I will discuss my recent work on the impact of modulated preheating on the formation of high-redshift mini-haloes, which is a key ingredient for the direct-collapse scenario of supermassive black holes.

Contact Person

所内联系人

郭宗宽
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