By Bernard Helffer

This crucial e-book explains how the means of Witten Laplacians will be necessary in statistical mechanics. It considers the matter of examining the decay of correlations, after providing its beginning in statistical mechanics. furthermore, it compares the Witten Laplacian strategy with different strategies, similar to the move matrix process and its semiclassical research. the writer concludes by way of delivering an entire facts of the uniform Log-Sobolev inequality.

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**Extra info for Semiclassical Analysis, Witten Laplacian (Series on Partial Differential Equations and Applications)**

**Example text**

This equality means (fi + ,i4fi_) + ( f i _ , A f i + ) = 0 . 42 Laplace integrals and transfer operators We then get a contradiction unless ft+ = 0 or ft_ = 0 . We can then assume ft > 0 and the assumption gives again 0 < (9, Aft) = \(6, ft) , for any positive 9. e . e . Finally if two linearly independent eigenvectors \& and ft corresponding to A exist, we would obtain the same property for ^ by considering as new Hilbert space the orthogonal of ft in W. But it is impossible to have two orthogonal vectors which are strictly positive.

8) • Step 2 Once we have determined t, we immediately get the corresponding H(t), by writing / exp -P(x, y) dy = ^i(i) . 9) JR We obtain Mi(«) = f e x p - ^ ± V dy = (-^~)i . 10) * a-\-t The eigenvector being strictly positive, it is necessarily the ground state (according to the Perron-Probenius Theorem), that is the eigenvector corresponding to the largest eigenvalue of K. We have consequently found the "first" eigenvalue and the corresponding eigenvector. JR • Step 3 We observe that u\(x) = {^)* exp—|a; 2 satisfies ui(a;)-Mxui(a;)=0.

The operator K y is consequently a compact strictly positive selfadjoint operator. 6 Operators with strictly positive kernel and application We observe now that the kernel (x,y) H-» KV{X, y) satisfies the condition Kv(x,y) > 0 , Vx,y € IR . 1) In particular it satisfies the assumptions of the extended Perron-Probenius Theorem also called Krein-Rutman Theorem and our positive operator K y admits consequently a largest eigenvalue /ii equal to | | K v | | which is simple and corresponds to a unique strictly positive normalized eigenfunction which we denote by u\.