| 日時: |
2006-11-14 11:00 - 12:00 |
| 場所: |
研究本館2階220室 |
| 会議名: |
Cosmological Constraints on Gravitino LSP scenario with Sneutrino NLSP |
| 連絡先: |
津田 |
| 講演者: |
神崎 徹 (東京大学宇宙線研究所) |
| 講演言語: |
日本語 |
| アブストラクト: |
We study the scenario where a sneutrino is the next lightest supersymmetric particle (NLSP) and decays into a gravitino and standard model particles. The daughter particles such as neutrinos and quarks cause electro- and hadronic showers and affect big-bang nucleosynthesis. It is found that despite a small branching ratio, four-body processes including quarks in the final state give the most stringent constraint on the sneutrino abundance for gravitino mass of 1 ~ 100 GeV. Pion production by high energy neutrinos is important when the sneutrinos decay at ~ 1 sec. We also discuss the thermal leptogenesis in the sneutrino NLSP scenario. |
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