Lasse Rempe

  1. Exotic Baker and wandering domains for Ahlfors islands maps.

    Authors: Lasse Rempe, Philip J. Rippon
    Subjects: Complex Variables
    Abstract

    Let X be a Riemann surface of genus at most 1, i.e. X is the Riemann sphere
    or a torus. We construct a variety of examples of analytic functions g:W->X,
    where W is an arbitrary subdomain of X, that satisfy Epstein's "Ahlfors islands
    condition". In particular, we show that the accumulation set of any curve
    tending to the boundary of W can be realized as the omega-limit set of a Baker
    domain of such a function. As a corollary of our construction, we show that
    there are entire functions with Baker domains in which the iterates converge to
    infinity arbitrarily slowly.

  2. Connected escaping sets of exponential maps.

    Authors: Lasse Rempe
    Subjects: Dynamical Systems
    Abstract

    We show that for many complex parameters a, the set of points that converge
    to infinity under iteration of the exponential map f(z)=e^z+a is connected.
    This includes all parameters for which the singular value escapes to infinity
    under iteration.

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