On the relaxation time of Gauss's continued-fraction map I. The Hilbert space approach (Koopmanism) |
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Authors: | D Mayer G Roepstorff |
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Institution: | (1) Present address: Institut für Theoretische Physik, RWTH Aachen, D-51 Aachen, West Germany;(2) Institute for Advanced Study, 08540 Princeton, New Jersey |
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Abstract: | It is shown thatU
*, the adjoint of Koopman's isometric operatorUf(x) =f(Tx) corresponding to the mapTx=x
–1 (mod 1) of the unit interval, is isomorphic to a symmetric integral operator when restricted to a Hilbert space of holomorphic functionsf This result, also obtained by Babenko in a different setting, allows us to derive new trace formulas. Using generalized Temple's inequalities, we determine the relaxation time of the above system with great accuracy. In contrast to a widespread belief, it appears to be unrelated to the entropy of the mapT. |
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Keywords: | Relaxation time continued fraction trace formulas Temple's inequalities |
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