解析学火曜セミナー

開催情報 火曜日　16:00～17:30　数理科学研究科棟(駒場) 126号室 石毛 和弘, 坂井 秀隆, 伊藤 健一 https://www.ms.u-tokyo.ac.jp/seminar/analysis/

2021年06月08日(火)

16:00-17:30   オンライン開催

Local well-posedness for the Landau-Lifshitz equation with helicity term (Japanese)
[ 講演概要 ]
We consider the initial value problem for the Landau-Lifshitz equation with helicity term (chiral interaction term), which arises from the Dzyaloshinskii-Moriya interaction. We show that it is locally well-posed in Sobolev spaces $H^s$ when $s>2$. The key idea is to reduce the problem to a system of semi-linear Schr\"odinger equations, called modified Schr\"odinger map equation. The problem here is that the helicity term appears as quadratic derivative nonlinearities, which is known to be difficult to treat as perturbation of the free evolution. To overcome that, we consider them as magnetic terms, then apply the energy method by introducing the differential operator associated with magnetic potentials.
[ 参考URL ]
https://forms.gle/nc85Mw9Jd6NgJzT98