教師資料查詢 | 類別: 期刊論文 | 教師: 劉國欽 LIOU GUO CHIN (瀏覽個人網頁)

標題:Axion dark matter induced cosmic microwave background B modes
學年105
學期2
出版(發表)日期2017/06/01
作品名稱Axion dark matter induced cosmic microwave background B modes
作品名稱(其他語言)
著者Liu Guo-Chin; Ng Kin-Wang
單位
出版者
著錄名稱、卷期、頁數Physics of the Dark Universe 16, p.22-25
摘要It was known that isocurvature perturbation of a nearly massless cosmological axion field can lead to rotation of E-mode polarization into B-mode polarization in the cosmic microwave background (CMB) by the presence of a parity violating coupling of the field to the topological density of electromagnetism, resulting in a phenomenon known as anisotropic cosmic birefringence. In this Letter, we propose a new source of anisotropic cosmic birefringence induced by dark matter adiabatic density perturbation. If dark matter is ultralight axions that carry a coupling to photon, its adiabatic density fluctuations will induce anisotropic cosmic birefringence with a blue-tilted rotation power spectrum, thus generating CMB B-mode polarization on sub-degree angular scales. Using current POLARBEAR and SPTPol B-mode polarization data, we derive a constraint on the axion–photon coupling strength (β) and the axion mass (m), β2(10−22eV∕m)2<8×1015. It is shown that the birefringence B modes can dominate over CMB lensing B modes at high l, manifesting as an excess power for l>1500 in future CMB lensing B-mode searches. In addition, we derive the lensing–rotation cross correlation that can be a potential test to the present model.
關鍵字CMB polarization;Ultra-light axion
語言英文
ISSN
期刊性質國外
收錄於SCI;
產學合作
通訊作者
審稿制度
國別荷蘭
公開徵稿
出版型式,紙本
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