Abstract
Intuition about the SRB distributions, hence about the statistics of chaotic evolutions, requires an understanding of their nature. The physical meaning discussed in Sect. 3.8 is not sufficient because the key notion of SRB potentials is still missing.
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Notes
- 1.
This means fixing for each \(q\) two strings \(\mathbf{a}(\mathbf{q})=\{a_0=q,a_1,\ldots , a_{m-1},a_m=\overline{q}\}\) and \(\mathbf {b}(\mathbf{q})=\{ b_0=\overline{q},b_1,\ldots ,b_{m-1},b_m=q\}\) such that \(\prod _{i=0}^{m-1} M_{a_i,a_{i+1}}=\prod _{i=0}^{m-1} M_{b_i,b_{i+1}}=1\).
- 2.
The continuation has to be done choosing arbitrarily but once and for all a compatible sequence starting with \(\overline{q}\): the simplest is to repeat indefinitely a string of length \(m\) beginning and ending with \(\overline{q}\) to the right and to the left.
- 3.
Because of transitivity of the compatibility matrix.
- 4.
This means that given \(\varepsilon , n>0\) there is \(k\) large enough so that the Gibbs’ distribution \(\mu _{SRB}\) with potential \(\varPhi \) and the Markov process \(\mu _k\) with potential \(\varPhi ^{[\le k]}\), truncation of \(\varPhi \) at range \(k\), will be such that \(\sum _{\mathbf{q}=(q_0,\ldots ,q_n)}\) \(|\mu _{SRB}(E(\mathbf{q}))-\mu _k(E(\mathbf{q}))|<\varepsilon \) and the Kolmogorov-Sinai’s entropy (i.e. \(s( \mu )\,{\mathop {=}\limits ^{def}}\,\) \(\mathop {\lim }\limits _{n\rightarrow \infty } -\frac{1}{n}\sum _{\mathbf{q}=(q_0,\ldots q_{n})} \mu (E(\mathbf{q}))\log \mu (E(\mathbf{q}))\)) of \(\mu _{SRB}\) and \(\mu _k\) are close within \(\varepsilon \).
- 5.
Hence \(x_{ii}=Ix_{ii}\) if \(E_i\cap I E_i\) is a non empty rectangle. Such a fixed point exists because the rectangles are homeomorphic to a ball. The fixed point theorem can be avoided by associating to \(E_i\cap I E_i\) two centers \(x^1_{ii}\) and \(x^2_{ii}=I x^1_{ii}\): we do not do so to simplify the formulae.
- 6.
The transformation \(\varPhi \) of a perturbed Anosov map into the unperturbed one is in general not a smooth change of coordinates but just Hölder continuous. So that the image of \(I\) in the new coordinates might be hard to use.
- 7.
Because the version of Eq. (2.8.6) for evolutions in continuous time is \(\lim _{\tau \rightarrow \infty }\) \(\frac{1}{\tau }\log \det (\partial S_\tau (x))=\sum _{i=0}^{2D-1}\lambda _i\).
- 8.
Since the model is defined in continuous time the matrix \((\partial S_t)^*\partial S_t\) will always have a trivial eigenvalue with average \(0\).
- 9.
This does not preclude the possibility that the attractor has a fractal dimension (smoothness of the closure of an attractor has nothing to do with its fractal dimensionality, see [13–15]). The motion on this lower dimensional surface (whose dimension is smaller than that of phase space by an amount equal to the number of paired negative exponents) will still have an attractor (see p. 39) with dimension lower than the dimension of the surface itself, as suggested by the Kaplan–Yorke formula, [13].
- 10.
As discussed below, it requires a proof and therefore it should not be confused with several identities to which, for reasons that I fail to understand, the same name has been given, [22] and Appendix L.
- 11.
Actual computation of \(\zeta (p)\) is a task possible in the \(N=1\) case considered in [24] but essentially beyond our capabilities in slightly more general systems in the non linear regime.
- 12.
That is, not infinitesimally close to \(0\) as in the classical theory of nonequilibrium thermodynamics, [30].
- 13.
Colorfully: A waterfall will go up, as likely as we see it going down, in a world in which for some reason, or by the deed of a Daemon, the entropy production rate has changed sign during a long enough time [29, p. 476].
- 14.
Suggested by P. Garrido from the data in the simulation in [12].
- 15.
It says that essentially \(\langle e^{I_E}\rangle _{\mu _E}\equiv 1\) or more precisely it is not too far from \(1\) as \(\tau \rightarrow \infty \) so that Eq. (4.8.4) holds.
- 16.
For a time long enough for being able to consider it as a moving container: for instance while its motion can be considered described by a linear transformation and at the same time long enough to be able to make meaningful observations.
- 17.
Writing the paper [49] I was unaware of these works: I thank Dr. M. Campisi for recently pointing this reference out.
- 18.
Defined, for instance, as the limit of the distributions obtained by evolving in time the Eq. (4.11.6).
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Gallavotti, G. (2014). Fluctuations. In: Nonequilibrium and Irreversibility. Theoretical and Mathematical Physics. Springer, Cham. https://doi.org/10.1007/978-3-319-06758-2_4
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