El Seminario de Sistemas Dinámicos de Santiago es el encuentro semanal de matemáticas con mayor tradición en el país pues se realiza ininterrumpidamente desde la década del '80. Se realiza alternadamente en alguna de las instituciones de Santiago donde hay miembros del grupo de Sistemas Dinámicos. Participan así las universidades de Chile, de Santiago, Andrés Bello y Católica de Chile.
2009-11-02
Peter Haissinsky. Marseillle A notion of invariant line fields for coarse conformal dynamical systems Sala 2 (Víctor Ochsenius) - 16:30 Hrs. Facultad de Matemáticas - UC Abstract: We will focus on the dynamics of finite branched coverings of the two-sphere which preserve a coarse conformal structure. We will develop a notion of invariant line fields in this context which will enable us to characterize those maps which admit optimal metrics (in the sense of Hausdorff dimension)
2009-10-26
Milton Cobo, Ufes-Brazil. Ufes-Brazil. Carlos Gutierrez and injectivity of planar maps CMM UdeChile (7mo piso), 17.00 hrs Abstract: Resumen: C. Gutierrez proved, in 1995, the ``global asymptotic conjecture in dimension 2: If $X:R^2 mapsto R^2$ is a $C^1$ vector field with $X(0)=0$ and such that, for all $pinR^2$, the eigenvalues of the derivative $DX_p$ have negative real part, then $(0,0)$ is a global attractor of the dynamical system ( dot{x} = X(x). )
In this lecture we will present a series of elegant results on injectivity of planar maps $X:R^2 mapsto R^2$, obtained by Gutierrez, and which provide a simple proof of this conjecture. This lecture is a small tribute to Prof. Gutierrez who passed away last year."
2009-10-19
Eugenio Trucco. Pontificia Universidad Católica de Chile Componentes de Fatou Errantes y Conjuntos de Julia Algebraicos Sala 2 (Víctor Ochsenius) - Facultad de Matemáticas - 16:30 Hrs. Abstract: Dado un polinomio $P$ con coeficientes en $L,$ la completacion del cuerpo de series formales de Puiseux, estudiaremos la acción de $P,$ como sistema dinámico, en la linea afín de Berkovich asociada a $L$. Probaremos que toda componente errante del conjunto de Fatou esta contenida en la cuenca de atracción de una orbita periódica, Esto es, un análogo del Teorema de Sullivan sobre dominios errantes. Mostraremos que la parte emph{no clásica} del conjunto de Julia de $P$ consiste de un numero finito de grandes orbitas de puntos periódicos. Además, daremos una caracterización de los polinomios cuyo conjunto de Julia es emph{algebraico.}
2009-10-05
Hector Hardy Pastén. Universidad de Concepción El Problema de Büchi y el Decimo Problema de Hilbert Para Funciones Meromorfas P-Adicas Sala 2 (Víctor Ochsenius) Facultad de Matemáticas PUC - 16:30 Hrs.
2009-09-21
Gonzalo Contreras. Cimat México Minicurso Dinámica Lagrangeana Sala 3 (sector postgrado) - Facultad de Matemáticas - 16:30 Hrs. Abstract: Las siguientes sesiones se realizarán los días 23, 25, 28 y 30 de septiembre en el mismo lugar y a la misma hora."
2009-09-14
Daniel Smania. Icmc-Usp (San Carlos), Brasil On infinitely cohomologous to zero observables Sala 2 (Víctor Ochsenius)- Facultad de Matemáticas PUC. Abstract: Resumen: We show that for a large class of piecewise expanding maps T, the bounded p-variation observables u_0 that admits an infinite sequence of bounded p-variation observables u_i satisfying u_i(x)= u_{i+1}(Tx) -u_{i+1}(x) are constant. The method of the proof consists in to find a suitable Hilbert basis for L^2(hm), where hm is the unique absolutely continuous invariant probability of T. In terms of this basis, the action of the Perron-Frobenious and the Koopan operator on L^2(hm) can be easily understood. This result generalizes earlier results by Bamon, Kiwi, Rivera-Letelier and Urzua in the case T(x)= n x mod 1, n in N-{0,1} and Lipchitizian observables u_0. This a joint work with Amanda de Lima.
2009-08-26
Laurent Bartholdi. University de Göttingen Insanely Twisted Rabbits Sala 3 (sector postgrado) Facultad de Matemáticas de la PUC.
2009-08-24
Helge Gloeckner. Universitat Paderborn Invariant manifolds for ultrametric dynamical systems and applications in Lie theory Sala 2 (Víctor Ochsenius), Facultad de Matemáticas - UC. 16:00 Hrs. Abstract: Resumen: Consider a diffeomorphism f: M-> M of a manifold M over a complete ultrametric field (like the p-adic numbers) and a fixed point, x, of f. Then one can construct the usual types of invariant manifolds around x, as familiar from the case of manifolds over the real numbers. These studies were motivated by questions concerning Lie groups over local fields. They allow results to be extended to the case of Lie groups over local fields of positive characteristic, which previously were only known in the case of zero characteristic (i.e., only for p-adic Lie groups).
2009-08-24
Mike Todd. Universidade Do Porto. Recurrence and Extreme Value Theory in Dynamical System Sala 2 (Víctor Ochsenius), Facultad de Matemáticas - UC 17:15 Hrs.
2009-08-17
Alejandro Maass. Dim-Cmm U de Chile A structure theorem in topological dynamics and applications to nilsequences and maximal nilfactors Sala múltiple B del CENI-USACH Abstract: Resumen: In this talk we present a characterization of (inverse limits of) nilsystems of any order by introduciong the notion of dynamical parallelepiped. This characterization is used to give a (kind of) local characterization of nilsequences and provide a way to construct maximal nilfactors of a topological dynamical systems in the espirit of the structure theorem by Host and Kra used to prove non conventional ergodic theorems in measurable dynamics.
2009-08-10
Michael Schraudner. Cmm-Udechile Projectional entropy of multidimensional shifts. Sala de Seminarios 7mo piso del CMM-UdeChile Abstract: Resumen: We define the projectional entropy of multidimensional shifts with respect to any lower-dimensional sublattice and investigate under which conditions this quantity equals the topological entropy of the original shift. Constructing a three dimensional shift of finite type which satisfies a uniform mixing condition we exhibit a subtle difference between the results for one-dimensional and higher-dimensional sublattices.
The presented results are contained in a paper recently accepted for publication in Discrete and Continuous Dynamical Systems which is also available from my web-page.
2009-07-20
Thomas Jordan. University of Warwick Hausdorff Dimension of Projections of Self-Affine Carpets. Sala 2 (Víctor Ochsenius) - 16:00 Hrs. Facultad de Matemáticas - UC
2009-06-08
Feliks Przytycki. Impan Polonia On The Hausdorff Dimension Spectrum for Characteristic Lyapunov Exponents for Iteration of Rational Maps on The Riemann Sphere Sala 2 (Víctor Ochsenius) - 16:30 Hrs. Facultad de Matemáticas - UC
2009-06-01
Jan Kiwi, PUC. Pontificia Universidad Católica de Chile Dinámica Compleja y Dinámica Sobre el Cuerpo de Series de Puiseux: Aplicaciones Racionales Cuadráticas Sala 2 (Vìctor Ochsenius) - Facultad de Matemáticas - 16:30 Hrs.
2009-05-25
Andres Navas. Universidad de Santiago de Chile Como Ordenar Trenzas USACH - Sala por confirmar
2009-05-11
Juan Rivera Letelier. Pontificia Universidad Católica de Chile Statistical properties of real and complex one-dimensional dynamical systems Sala 2 (Vìctor Ochsenius) - Facultad de Matemáticas - 16:30 Hrs. Abstract:
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2009-04-27
Carlos Vasquez. Universidad Católica de Valparaiso Sobre la abundancia de medidas físicas para difeomorfismosparcialmente hiperbólicos USACH, sala por avisar. Abstract:
2009-04-24
Irene Inoquio Estados de Equilibrio Con Potenciales Holder de Aplicaciones en Dimensión 1 Sala 7 del CAI, Usach.
2009-04-20
Ronnie Pavlov. British Columbia, Canadá Estimating the entropy of a Z^d shift of finite type with probabilistic methods Sala de Seminarios CMM - 17:00 Hrs. Abstract:
2009-04-13
Gerardo Honorato. Universidad de Santiago de Chile On the topology of Julia sets of root-finding algorithms Sala 2 (Vìctor Ochsenius) - Facultad de Matemáticas - 16:30 Hrs. Abstract: Abstract: We prove that the Julia set of Koenigs root-finding algorithms applied to polynomials is not always connected (excluding Newtons method). We will also show examples of non connected Julia sets of Koenigs root-finding algorithms applied to rational maps (including Newtons method). In addition, we give an example of Julia set of Newtons method for multiple roots applied to one specific cubic polynomial which is a four circle inversion.