Mathematics – Dynamical Systems
Scientific paper
2010-03-29
Mathematics
Dynamical Systems
Typos corrected. Banach spaces (Prop 4.10, Prop 4.11, Lem 4.12, Appendix B, Section 6) cleaned up: H^1_1 Sobolev space replace
Scientific paper
We consider C^2 families of C^4 unimodal maps f_t whose critical point is slowly recurrent, and we show that the unique absolutely continuous invariant measure of f_t depends differentiably on t, as a distribution of order 1. The proof uses transfer operators on towers whose level boundaries are mollified via smooth cutoff functions, in order to avoid artificial discontinuities. We give a new representation of the acim for a Benedicks-Carleson map f_t, in terms of a single smooth function and the inverse branches of f_t along the postcritical orbit. Along the way, we prove that the twisted cohomological equation v(x)=\alpha (f (x)) - f'(x) \alpha (x) has a continuous solution \alpha, if f is Benedicks-Carleson and v is horizontal for f.
Baladi Viviane
Smania Daniel
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