Theory Seminar

KEK Theory Seminar (Prof. Yuko Urakawa)

Start:2018/03/12 (Mon) 1:30 PM
End:2018/03/12 (Mon) 2:30 PM
Location:Kenkyu-Honkan 1F, Meeting Room 1

Speaker:Prof. Yuko Urakawa ( Nagoya University)
Lecture:Exploring string axiverse from gravitational wave background


I will talk about our recent work with N. Kitajima and J. Soda, where we initiated a study on various cosmological imprints of string axions whose scalar potentials

have plateau regions. In such cases, a delayed onset of oscillation generically leads to a parametric resonance instability. We show that a sustainable resonance can lead to a turbulence phase during which detectable gravitational waves by pulsar timing arrays can be emitted.

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