A gigaparsec-scale local void and the Hubble tension

作     者：QianHang Ding Tomohiro Nakama Yi Wang QianHang Ding;Tomohiro Nakama;Yi Wang

作者机构：Department of PhysicsThe Hong Kong University of Science and TechnologyHong KongChina Jockey Club Institute for Advanced StudyThe Hong Kong University of Science and TechnologyHong KongChina 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2020年第63卷第9期

页      面：7-15页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 

主　　题：Hubble tension void cosmology inflation 

摘      要：We explore the possibility of using a gigaparsec-scale local void to reconcile the Hubble *** a gigaparsec-scale void can be produced by multi-stream inflation where different parts of the observable universe follow different inflationary *** trajectories become different parts of the observable universe after inflation,when these scales return to the *** these trajectories have different e-folding numbers,these parts of the universe have different energy densities,possibly creating a local large *** impacts of such a void for cosmological observations are studied,especially those involving supernovae,Baryon Acoustic Oscillations(BAO)and the kinetic Sunyaev-Zel’dovich(kSZ)*** show that with the presence of the void,supernovae observations may be more consistent with the *** also estimate the impacts of a local large void on BAO *** addition,we show that a local large void and hence its capabilities to ease the Hubble tension is limited by the kSZ *** a benchmark model,a 1.7 Gpc scale void with boundary width 0.7 Gpc and density contrast-0.14 may ease the Hubble tension,evading the kSZ limit.