Home | Contact | Sitemap | 中文 | CAS
Search: 
Home │  About Us │  Research │  People │  International Cooperation │  Education & Training │  KITPC │  Papers
  Seminar
Conference
Forum on FS
Colloquium
Seminar
Lunch Seminar
Coffee Time
Advanced Course
KITPC Activities
Other activities
  Location: Home >  Research Activities >  Seminar
ALP miracle: a simple unification of inflation and dark matter
2017-10-20     Text Size:  A

CAS Key Laboratory of Theoretical Physics

Institute of Theoretical Physics

 Chinese Academy of Sciences

Seminar

Title

题目

ALP miracle: a simple unification of inflation and dark matter

Speaker

报告人

殷文

Affiliation

所在单位

IHEP, Beijing

Date

日期

2017年10月20日(周五)下午4:00

Venue

地点

Room 6420, ITP NEW BUILDING

Abstract

摘要

We propose a scenario where both inflation and dark matter are described by a single axion-like particle (ALP) in a unified manner. In a class of the minimal axion hilltop inflation, the effective masses at the maximum and minimum of the potential have equal magnitude but opposite sign, so that the ALP inflaton is light both during inflation and in the true vacuum. After inflation, most of the ALPs decay and evaporate into plasma through a coupling to photons, and the remaining ones become dark matter. We find that the observed CMB and matter power spectrum as well as the dark matter abundance point to an ALP of mass 
mϕ=(0.01−0.1) eV and the axion-photon coupling gϕγγ=(10^−11) GeV^−1, which are within reach of future solar axion helioscope experiments IAXO, TASTE and laser-based stimulated photon-photon collider experiments: ALP miracle. This region is hinted by several anomalies. The thermalized ALP particles contribute to hot dark matter and its abundance is given in terms of the effective number of extra neutrino species, ΔNeff≃0.03, which can be tested by the future CMB and BAO observations. We also discuss possible extensions of the ALP miracle scenario by introducing other interactions of the axion-like particle to the standard model fields.
 

Contact person

所内联系人

杨金民
  Appendix:
       Address: Zhong Guan Cun East Street 55 #, P. O. Box 2735, Beijing 100190, P. R. China
Copyright © Institute of Theoretical Physics, Chinese Academy of Sciences, All Rights Reserved