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- W938962754 abstract "Consider then cubic defocusing nonlinear wave equation on three dimensional Euclidean space, with radial initial data. In this thesis, we construct a Gibbs measure for this system and prove its invariance under the flow of the NLW. In particular, we are in the infinite volume setting.For the finite volume analogue, specifically on the unit ball with zero boundary values, an invariant Gibbs measure was constructed by Burq, Tvetkov, and de Suzzoni as a Borel measure on super-critical Sobolev spaces.We first show that this finite volume Gibbs measure is supported on a space of weighted Holder continuous functions. Next, we show that the NLW is locally well-posed there, a counter-point to the Sobolev super-criticality noted by Burq and Tzvetkov. Furthermore, the flow of the NLW leaves this measure invariant.We use a multi-time Feynman--Kac formula to construct the infinite volume limit measure by computing the asymptotics of the fundamental solution of an appropriate parabolic PDE. We use finite speed of propagation and results from descriptive set theory to establish invariance of the infinite volume measure." @default.
- W938962754 created "2016-06-24" @default.
- W938962754 creator A5070619646 @default.
- W938962754 date "2014-01-01" @default.
- W938962754 modified "2023-09-27" @default.
- W938962754 title "Hamiltonian Systems and Gibbs Measures" @default.
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- W938962754 hasPublicationYear "2014" @default.
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