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解析学火曜セミナー
過去の記録 ～12/24｜次回の予定｜今後の予定 12/25～
| 開催情報 | 火曜日 16:00～17:30 数理科学研究科棟(駒場) 号室 |
|---|---|
| 担当者 | 石毛 和弘，宮本 安人，坂井 秀隆，三竹 大寿，高田 了 |
| セミナーURL | https://www.ms.u-tokyo.ac.jp/seminar/analysis/ |
次回の予定
2026年01月13日(火)
16:00-17:30 数理科学研究科棟(駒場) 002号室
ザンペイソフ エルボル 氏 (東北大学)
Blow-up rate for the subcritical semilinear heat equation in non-convex domains (Japanese)
ザンペイソフ エルボル 氏 (東北大学)
Blow-up rate for the subcritical semilinear heat equation in non-convex domains (Japanese)
[ 講演概要 ]
We study the blow-up rate for solutions of the subcritical semilinear heat equation. Type I blow-up means that the rate agrees with that of the associated ODE. In the Sobolev subcritical range, type I estimates have been proved for positive solutions in convex or general domains (Giga–Kohn ’87; Quittner ’21) and for sign-changing solutions in convex domains (Giga–Matsui–Sasayama ’04). We extend these results to sign-changing solutions in possibly non-convex domains. The proof uses the Giga-Kohn energy together with a geometric inequality that controls the effect of non-convexity. As a corollary, we obtain blow-up of the scaling critical norm in the subcritical range. Based on joint work with Hideyuki Miura and Jin Takahashi (Institute of Science Tokyo).
We study the blow-up rate for solutions of the subcritical semilinear heat equation. Type I blow-up means that the rate agrees with that of the associated ODE. In the Sobolev subcritical range, type I estimates have been proved for positive solutions in convex or general domains (Giga–Kohn ’87; Quittner ’21) and for sign-changing solutions in convex domains (Giga–Matsui–Sasayama ’04). We extend these results to sign-changing solutions in possibly non-convex domains. The proof uses the Giga-Kohn energy together with a geometric inequality that controls the effect of non-convexity. As a corollary, we obtain blow-up of the scaling critical norm in the subcritical range. Based on joint work with Hideyuki Miura and Jin Takahashi (Institute of Science Tokyo).
