Probing Axions with Event Horizon Telescope Polarimetric Measurements

被引：91

作者：

Chen, Yifan ^{[1
,2
,3
]}

Shu, Jing ^{[1
,4
,5
,6
,7
]}

Xue, Xiao ^{[1
,4
]}

Yuan, Qiang ^{[7
,8
,9
]}

Zhao, Yue ^{[10
]}

机构：

[1] Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China

[2] Sorbonne Univ, LPTHE, UMR 7589, 4 Pl Jussieu, F-75252 Paris 05, France

[3] CNRS, 4 Pl Jussieu, F-75252 Paris 05, France

[4] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China

[5] Ctr Excellence Particle Phys, Beijing 100049, Peoples R China

[6] Univ Chinese Acad Sci, Hangzhou Inst Adv Study, Sch Fundamental Phys & Math Sci, Hangzhou 310024, Peoples R China

[7] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China

[8] Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Peoples R China

[9] Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China

[10] Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 124卷 / 06期

基金：

中国国家自然科学基金;

关键词：

ROTATING BLACK-HOLE; CP CONSERVATION; PERTURBATIONS; POLARIZATION;

D O I：

10.1103/PhysRevLett.124.061102

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

With high spatial resolution, polarimetric imaging of a supermassive black hole, like M87(star) or Sgr A(star), by the Event Horizon Telescope can be used to probe the existence of ultralight bosonic particles, such as axions. Such particles can accumulate around a rotating black hole through the superradiance mechanism, forming an axion cloud. When linearly polarized photons are emitted from an accretion disk near the horizon, their position angles oscillate due to the birefringent effect when traveling through the axion background. In particular, the observations of supermassive black holes M87(star) (Sgr A(star)) can probe the dimensionless axion-photon coupling c = 2 pi g(a gamma)f(a) for axions with mass around O(10(-20)) eV [O(10(-17)) eV] and decay constant f(a) < O(10(16)) GeV, which is complimentary to other axion measurements.

引用

页数：7

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