Speaker
Description
Axion couplings to photons can induce photon-axion conversion in the propagation of photons, with either the presence of a magnetic field or axion relic abundance. I first will show that this conversion impacts various cosmic distance measurements, such as luminosity distances to type Ia supernovae (~Gpc scale) and angular distances to galaxy clusters (~Mpc scale). I will consider different combinations of the most up-to-date distance measurements to constrain the axion-photon coupling, and show they can put the strongest constraints of axion-photon couplings to date. At an even shorter distance, I will briefly discuss the axion stimulated decay, a novel approach to constrain axion-photon coupling, by observing the echo signals in directions opposite to galactic supernova remnants (~kpc away) in the radio band. I will demonstrate that the strength of the "echo" signal from axion stimulated decay depends on the history of the photon source. Even though some supernova remnants are dim today, they can lead to the strongest bound of photon-axion coupling for axions around 10^{-6} eV.
| Participation | I plan to attend in person |
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