| Speaker: | Jiaming Zheng (Physics Department, University of Tokyo) |
|---|---|
| Title: | Limit on the Axion Decay Constant from the Cooling Neutron Star in Cassiopeia A |
| Date (JST): | Wed, Feb 06, 2019, 13:30 - 14:30 |
| Place: | Seminar Room A |
| Related File: | 2254.pdf |
| Abstract: |
The observed rapid cooling of the neutron star (NS) located at the center of the supernova remnant Cassiopeia A (Cas A) can be explained in the minimal NS cooling scenario. This consequence may be changed if there exists an extra cooling source, such as axion emission. We study the Cas A NS cooling in the presence of axion emission, taking account of the temperature evolution in the whole life of the Cas A NS. The axion is dominantly emitted through the continuous breaking and formation of cooper-pairs of protons. The lower limit we obtained is as strong as existing limits imposed by other astrophysical observations such as SN1987A. |
