Archive for Rational Mechanics and Analysis

, Volume 140, Issue 2, pp 161–195 | Cite as

Long-Time Behaviour of Heat Flow: Global Estimates and Exact Asymptotics

  • J. R. Norris
Article

Abstract

We obtain global upper and lower bounds on the heat kernel of an elliptic second-order differential operator, which become sharp in certain long-time and large-space asymptotics. We prove a generalization of Aronson's Gaussian bounds which identifies correctly an effective drift for heat flow. In the case of periodic coefficients we give variational characterizations of the effective conductivity, which is then made to appear in heat kernel bounds. These results are for heat kernels with measurable coefficients. For differentiable coefficients we prove tighter estimates, in which the rate of homogenization is known to be optimal.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • J. R. Norris
    • 1
  1. 1.Statistical Laboratory, University of Cambridge, 16 Mill Lane, Cambridge CB2 1SB, UKGB

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