Cosmological constraints on ultra-light axion fields

作     者：Jian-Gang Kang Yan Gong Gong Cheng Xuelei Chen Jian-Gang Kang;Yan Gong;Gong Cheng;Xuelei Chen

作者机构：Key Laboratory for Computational AstrophysicsNational Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy and Space ScienceUniversity of Chinese Academy of SciencesBeijing 100049China Centre for High Energy PhysicsPeking UniversityBeijing 100871China 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2020年第20卷第4期

页      面：99-106页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：support of the National Natural Science Foundation of China(NSFC,Grant Nos.11822305,11773031 and 11633004) the Chinese Academy of Sciences(CAS)Strategic Priority Research Program(XDA15020200) the NSFC-ISF joint research program(No.11761141012) the CAS Interdisciplinary Innovation Team 

主　　题：cosmology dark energy cosmological parameters 

摘      要：Ultra-light axions(ULAs)with mass less than 10-20 eV have interesting behaviors that may contribute to either dark energy or dark matter at different epochs of the *** properties can be explored by cosmological observations,such as expansion history of the Universe,cosmic large-scale structure,cosmic microwave background,*** this work,we study the ULAs with mass around 10-33 eV,which means that the ULA field still rolls slowly at present with the equation of state w=-1 as dark *** investigate the mass and other properties of this kind of ULA field,we adopt the measurements of Type Ia supernova(SN Ia),baryon acoustic oscillation(BAO),and Hubble parameter H(z).The Markov Chain Monte Carlo(MCMC)technique is employed to perform the constraints on the ***,by exploring four cases of the model,we find that the mass of this ULA field is about 3×10-33 eV if assuming the initial axion fieldφi=*** also investigate a general case by assumingφi≤Mpl,and find that the fitting results ofφi/Mpl are consistent with or close to 1 for the datasets that we use.