| Budget Amount *help |
¥19,370,000 (Direct Cost: ¥14,900,000、Indirect Cost: ¥4,470,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
Fiscal Year 2017: ¥8,710,000 (Direct Cost: ¥6,700,000、Indirect Cost: ¥2,010,000)
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| Outline of Final Research Achievements |
A pseudo Nambu-Goldstone boson (pNGB) may appear in the realm of nature whenever a global symmetry is spontaneously broken. If the coupling to matter is weak enough, sub-eV pNGBs can be natural candidates for the dark component of the Universe. By focusing two-color pulsed lasers into a quasi-vacuum state, we have searched for resonance states of pNGBs via four-wave mixing in vacuum. Within the laser intensity ranges we could manage to control the background level, no significant four-wave mixing signal was observed and we then succeeded to constrain the coupling-mass relation for pNGBs at a 95% confidence level. In addition to publishing the search result, we also published extended ideas to probe pNGBs by combining photon beams with totally different wavelengths.
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