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Roberto Peirone

Publications and source records attributed to Roberto Peirone.

6 recordsLinked to original sources
arXiv2018

Fixed Points of anti-attracting maps and Eigenforms on Fractals

An important problem in analysis on fractals is the existence of a self-similar energy on finitely ramified fractals. The self-similar energies are constructed in terms of eigenforms, that is, eigenvectors of a special nonlinear operator. Previous results by C. Sabot and V. Metz give conditions for the existence of an eigenform. In this paper, I give a different and probably shorter proof of the previous results, which appears to be suitable for improvements. Such a proof is based on a fixed-point theorem for anti-attracting maps on a convex set.

math.FA↗
arXiv2017

A P.C.F. Self-Similar Set with no Self-Similar Energy

A general class of finitely ramified fractals is that of P.C.F. self-similar sets. An important open problem in analysis on fractals was whether there exists a self-similar energy on every P.C.F. self-similar set. In this paper, I solve the problem, showing an example of a P.C.F. self-similar set where there exists no self-similar energy.

math.FA↗
arXiv2015

Scaling Distances on Finitely Ramified Fractals

In previous papers by A. Kameyama and by J. Kigami distances on fractals have been discussed having two different but similar properties. One property is that the maps defining the fractal are Lipschitz of prescribed constants less than 1, the other is that the diameters of the copies of the fractal are asymptotic to prescribed scaling factors. In this paper, on a large class of finitely ramified fractals, we prove that these two problems are equivalent and give a necessary and sufficient condition for the existence of such distances. Such a condition is expressed in terms of asymptotic behavior of the product of certain matrices associated to the fractal.

math.MG↗
arXiv2015

Attractors of Iterated Function Systems with uncountably many maps

We study the topological properties of attractors of Iterated Function Systems (I.F.S.) on the real line, consisting of affine maps of homogeneous contraction ratio. These maps define what we call a second generation I.F.S.: they are uncountably many and the set of their fixed points is a Cantor set. We prove that when this latter either is the attractor of a finite, non-singular, hyperbolic, I.F.S. (of first generation), or it possesses a particular dissection property, the attractor of the second generation I.F.S. consists of finitely many closed intervals.

math.DS↗
arXiv2014

Uniqueness of Eigenforms on Fractals-II

I give an explicitly verifiable necessary and sufficient condition for the uniqueness of the eigenform on finitely ramified fractals, once an eigenform is known. This improves the results of my previous paper [14], where I gave some necessary and some sufficient conditions, and with a relatively mild additional requirement on the known eigenform. The result of this paper can be interpreted as a uniqueness result for self-similar energies on the fractal.

math.FA↗