| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Outline of Final Research Achievements |
The origin of dark matter (DM) cannot be found within the framework of the standard model of elementary particles. A DM candidate can be made stable by an unbroken symmetry. The simplest possibility of such a symmetry is a parity, Z2. In that case, the lightest Z2-odd particle can be a DM candidate if it is a neutral, weakly interacting and massive particle. On the other hand, a multi-component DM system can be realized if the DM stabilizing symmetry is larger than Z2. In this work, we studied the multi-component DM system in some models. A multi-component DM system induces various DM annihilation processes that are different from the standard DM annihilation process. We showed that the relic abundance of DM can be very sensitive to these non-standard DM annihilation processes.
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