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Ruelle zeta function

In mathematics, the Ruelle zeta function is a zeta function associated with a dynamical system. It is named after mathematical physicist David Ruelle.

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Formal definition

Let f be a function defined on a manifold M, such that the set of fixed points Fix(f n) is finite for all n > 1. Further let φ be a function on M with values in d × d complex matrices. The zeta function of the first kind is1

ζ ( z ) = exp ⁡ ( ∑ m ≥ 1 z m m ∑ x ∈ Fix ⁡ ( f m ) Tr ⁡ ( ∏ k = 0 m − 1 φ ( f k ( x ) ) ) ) {\displaystyle \zeta (z)=\exp \left(\sum _{m\geq 1}{\frac {z^{m}}{m}}\sum _{x\in \operatorname {Fix} (f^{m})}\operatorname {Tr} \left(\prod _{k=0}^{m-1}\varphi (f^{k}(x))\right)\right)}

Examples

In the special case d = 1, φ = 1, we have2

ζ ( z ) = exp ⁡ ( ∑ m ≥ 1 z m m | Fix ⁡ ( f m ) | ) {\displaystyle \zeta (z)=\exp \left(\sum _{m\geq 1}{\frac {z^{m}}{m}}\left|\operatorname {Fix} (f^{m})\right|\right)}

which is the Artin–Mazur zeta function.

The Ihara zeta function is an example of a Ruelle zeta function.3

See also

References

  1. Terras (2010) p. 28

  2. Terras (2010) p. 28

  3. Terras (2010) p. 29