Dynamical zeta functions for piecewise monotone maps of the by David Ruelle

By David Ruelle

Ponder an area $M$, a map $f:M\to M$, and a functionality $g:M \to {\mathbb C}$. The formal strength sequence $\zeta (z) = \exp \sum ^\infty _{m=1} \frac {z^m}{m} \sum _{x \in \mathrm {Fix}\,f^m} \prod ^{m-1}_{k=0} g (f^kx)$ yields an instance of a dynamical zeta functionality. Such features have unforeseen analytic houses and engaging family members to the idea of dynamical platforms, statistical mechanics, and the spectral idea of convinced operators (transfer operators). the 1st a part of this monograph provides a basic creation to this topic. The moment half is a close research of the zeta capabilities linked with piecewise monotone maps of the period $[0,1]$. In specific, Ruelle offers an evidence of a generalized type of the Baladi-Keller theorem concerning the poles of $\zeta (z)$ and the eigenvalues of the move operator. He additionally proves a theorem expressing the biggest eigenvalue of the move operator in phrases of the ergodic homes of $(M,f,g)$.

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Exchanging X and Y , the above becomes X(Y (T (Z))) = (∇X (∇Y T ))(Z) + (∇Y T )(∇X Z) + (∇X T )(∇Y Z) + T (∇X (∇Y Z)). Taking the difference of the last two identities, one obtains Y (X(T (Z))) − X(Y (T (Z))) = (∇Y (∇X T ))(Z) − (∇X (∇Y T ))(Z) + T (∇Y (∇X Z)) − T (∇X (∇Y Z)). Moving the first two terms of the right-hand side to the left, we arrive at (∇X (∇Y T ))(Z) − (∇Y (∇X T ))(Z) − [X, Y ](T (Z)) = T (∇Y (∇X Z)) − T (∇X (∇Y Z)). Since [X, Y ](T (Z)) = (∇[X,Y ] T )(Z) + T (∇[X,Y ] Z), the above becomes (∇X (∇Y T ))(Z) − (∇Y (∇X T ))(Z) − (∇[X,Y ] T )(Z) = T (∇Y (∇X Z)) − T (∇X (∇Y Z) + T (∇[X,Y ] Z)).

Xp , η1 , . . , ηq )) − . . − T (X1 , X2 , . . Xp , η1 , . . , ηq−1 , ∇X ηq )). e. (∇T )(X, X1 , . . Xp , η1 , . . , ηq ) ≡ (∇X T )(X1 , . . Xp , η1 , . . , ηq ). 1. 5 The motivation behind the above definition is the Leibnitz rule for differentiation. The term X(T (X1 , . . Xp , η1 , . . , ηq )) is nothing but the directional derivative of the scalar function T (X1 , . . Xp , η1 , . . , ηq ) in the direction of X. 14 (Riemann manifold) A Riemann manifold is a smooth manifold with a Riemann metric, a smooth, positive definite, symmetric (2, 0) tensor field.

A section of the cotangent bundle T (M)∗ is called a one form. A section of the tangent bundle T (M) is called a vector field. Let q be a positive integer, a section of ∧q T (M)∗ , the fiber bundle of skew-symmetric q-linear functionals on T (M), is called a q form. A canonical local coordinates for ∧q T (M)∗ is {dxi1 ∧ . . ∧ dxiq | i1 < . . < iq }. The theory of differential forms was developed by E. Cartan. It provides an approach to differentiation and integration, which is independent of coordinates.

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