MS Seminar (Mathematics - String Theory)

Speaker: Boris Hasselblatt (Tufts University)
Title: Increasing the complexity of free particle motion by breaking its mechanical nature
Date: Thu, Nov 01, 2018, 15:30 - 17:00
Place: Seminar Room B
Related File: 2171.pdf
Abstract: Starting from free particle motion of a negatively curved surface, a Dehn-like surgery on the phase space produces new flows that retain the contact property of a mechanical flow but no longer have a configuration space and are otherwise unusual and interesting. They are no longer topologically equivalent to a flow of an algebraic nature, and they have faster orbit growth. A like surgery on the purely periodic fiber flow makes it parabolic or hyperbolic, a change from no complexity to polynomial or exponential complexity, respectively. Moreover, in all cases the "contact structure" alone forces similar complexity.
Finally, an idea by Vinhage promises a quantification of the complexity increase.