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[5.20]Searching for axion-like particles using black holes and pulsars
文章来源:  |  发布时间:2019-05-17  |  浏览:

                          Seminar  

   

Title: Searching for axion-like particles using black holes and pulsars

 

Speaker:Dr. Yue Zhao (Utah University)

 

Time: 2:00 PM, May 20th (Monday), 2019

 

Place: R319, Theoretical Physics Divisin

 

Abstract:Axion-like particles are among the most popular candidates for newphysics beyond Standard Model. An axion background can induce the oscillation of the position angle for a linearly polarized photon, due to birefringence effect. We propose two ways to look for such an effect. First, with high spatial resolution, polarimetric imaging of a supermassive black hole, like M87* or Sgr A* , by the Event Horizon Telescope can be used to probe the existence of an axion field. The axion can accumulate around a rotating black hole through superradiance mechanism, forming an axion cloud. The supermassive black hole M87* (Sgr A*) can probe axions with masses O(10^?20) eV (O(10^?17) eV) and decay constant smaller than O(10^16) GeV. In addition, linearly polarized pulsar light can also be used as a probe. We show that this can potentially serach for an axion-photon coupling as small as ~10^?13 GeV^?1 for axion mass ~10^?22?10^?20 eV, given the current measurement accuracy.

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