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Theory Seminars (High Energy/Cosmology)

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Events on Tuesday, January 17th, 2017

The Fate of Axion Stars
Time: 3:30 pm
Place: 5280 Chamberlin
Speaker: Hong Zhang, Ohio State
Abstract: If the dark matter consists of axions, some of it will condense into axion stars, which are gravitationally bound Bose-Einstein condensates of axions. If an axion star accretes enough axions to exceed a critical mass, it will collapse. The fate of a collapsing axion star has not been established. One possibility for the remnant is a much denser axion star in which the attractive forces of gravity and axion pair interactions are balanced by the mean-field pressure of the axion Bose-Einstein condensate. A nonrelativistic effective field theory for axions can provide insights into the fate of axion stars. The collapsing process of axion stars and the possible denser remnant produce unique monochromatic radio-frequency signals at odd-integer harmonics of the fundamental frequency set by the axion mass.
Host: Josh Berger
Presentation: Axion_Hong_Zhang.pdf
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