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STATIONARY CRITICAL POINTS OF THE HEAT FLOW IN SPACES OF CONSTANT CURVATURE

Published online by Cambridge University Press:  08 April 2017

SHIGERU SAKAGUCHI
Affiliation:
Department of Mathematical Sciences, Faculty of Science, Ehime University, 2-5 Bunkyo-cho, Matsuyama-shi, Ehime 790-8577, Japan; [email protected]
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Abstract

The paper considers stationary critical points of the heat flow in sphere SN and in hyperbolic space ℍN, and proves several results corresponding to those in Euclidean space SN which have been proved by Magnanini and Sakaguchi. To be precise, it is shown that a solution u of the heat equation has a stationary critical point, if and only if u satisfies some balance law with respect to the point for any time. In Cauchy problems for the heat equation, it is shown that the solution u has a stationary critical point if and only if the initial data satisfies the balance law with respect to the point. Furthermore, one point, say x0, is fixed and initial-boundary value problems are considered for the heat equation on bounded domains containing x0. It is shown that for any initial data satisfying the balance law with respect to x0 (or being centrosymmetric with respect to x0) the corresponding solution always has x0 as a stationary critical point, if and only if the domain is a geodesic ball centred at x0 (or is centrosymmetric with respect to x0, respectively).

Type
Notes and Papers
Copyright
The London Mathematical Society 2001

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Footnotes

This research was partially supported by a Grant-in-Aid for Scientific Research (C) (# 10640175) of Japan Society for the Promotion of Science.