Resonant instabilities in cosmology
and their observational consequences

Yukawa Institute for Theoretical Physics, Kyoto University
May 7 - 20, 2019


Resonance instabilities widely take place in the presence of a coherently oscillating field and leads to fruitful phenomenological consequences in cosmology. The resonance instabilities in cosmology have been discussed especially in the context of reheating during which an efficient energy transfer from the oscillating inflaton to the standard model particles takes place. More recently, it was shown that axions, which are noble candidates of dark matter and inflaton, can leave detectable signals through observations of gravitational waves and electromagnetic field as a consequence of the resonance instabilities. This provides a new window of axion search.

During the two-week workshop, gathering international experts, we intensively discuss the recent progress of the resonance instability in cosmological context both from theoretical and phenomenological perspectives.


This workshop is supported by YITP-T-19-02 and JSPS KAKENHI (No. 19H01894 and No. 15H05889).


We will be grateful if you acknowledge this workshop in a paper which is initiated or conducted during this workshop. Here are the samples of acknowledgements:

- The authors thank Yukawa Institute for Theoretical Physics at Kyoto University, where this work was initiated [completed] during the YITP-T-19-02 on "Resonant instabilities in cosmology".
- The authors thank Yukawa Institute for Theoretical Physics at Kyoto University. Discussions during the YITP workshop YITP-T-19-02 on "Resonant instabilities in cosmology" were useful to complete this work.