Non-ergodicity for C^1 Expanding Maps

Details Non-ergodicity for C^1 Expanding Maps Non-ergodicity for C^1 Expanding Maps

1993-03-31

arxiv.org/abs/chao-dyn/9303018v1

Nonlinear Sciences

Chaotic Dynamics

7 pages, uses MSSYMB (non-essential)

Scientific paper

In this paper, we consider the question of existence and uniqueness of absolutely continuous invariant measures for expanding $C^1$ maps of the circle. This is a question which arises naturally from results which are known in the case of expanding $C^k$ maps of the circle where $k\geq 2$, or even $C^{1+\epsilon}$ expanding maps of the circle. In these cases, it is known that there exists a unique absolutely continuous invariant probability measure by the so-called `Folklore Theorem'. It follows that this measure is ergodic. It has been shown however that for $C^1$ maps there need not be any such measure. However, this leaves the question of whether there can be more than one such measure for $C^1$ expanding maps of the circle. This is the subject of this paper, and in it, we show that there exists a $C^1$ expanding map of the circle which has more than one absolutely continuous invariant probability measure.

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