## Differential and Integral Equations

### Quantitative uniqueness for time-periodic heat equation with potential and its applications

#### Abstract

In this paper, we establish a quantitative unique continuation property for some time-periodic linear parabolic equations in a bounded domain $\Omega$. We prove that for a time-periodic heat equation with particular time-periodic potential, its solution $u(x,t)$ satisfies $\left\| u(\cdot,0) \right\| _{L^{2}(\Omega) }\leq C\left\| u(\cdot,0) \right\| _{L^{2}(\omega) }$ where $\omega\subset\Omega$. Also we deduce the asymptotic controllability for the heat equation with an even, time-periodic potential. Moreover, the controller belongs to a finite dimensional subspace and is explicitly computed.

#### Article information

Source
Differential Integral Equations, Volume 19, Number 6 (2006), 627-668.

Dates
First available in Project Euclid: 21 December 2012

Permanent link to this document
https://projecteuclid.org/euclid.die/1356050356

Mathematical Reviews number (MathSciNet)
MR2234717

Zentralblatt MATH identifier
1212.93025

#### Citation

Phung, K.-D.; Wang, G. Quantitative uniqueness for time-periodic heat equation with potential and its applications. Differential Integral Equations 19 (2006), no. 6, 627--668. https://projecteuclid.org/euclid.die/1356050356