Department of

# Mathematics

Seminar Calendar
for Geometry, Groups and Dynamics/GEAR Seminar events the year of Tuesday, February 19, 2019.

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events for the
events containing

Questions regarding events or the calendar should be directed to Tori Corkery.
     January 2019          February 2019            March 2019
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1  2  3  4  5                   1  2                   1  2
6  7  8  9 10 11 12    3  4  5  6  7  8  9    3  4  5  6  7  8  9
13 14 15 16 17 18 19   10 11 12 13 14 15 16   10 11 12 13 14 15 16
20 21 22 23 24 25 26   17 18 19 20 21 22 23   17 18 19 20 21 22 23
27 28 29 30 31         24 25 26 27 28         24 25 26 27 28 29 30
31


Thursday, February 14, 2019

12:00 pm in 243 Altgeld Hall,Thursday, February 14, 2019

#### Spectral Rigidity of q-differential Metrics

###### Marissa Loving (UIUC Math)

Abstract: When geometric structures on surfaces are determined by the lengths of curves, it is natural to ask which curves’ lengths do we really need to know? It is a classical result of Fricke that a hyperbolic metric on a surface is determined by its marked simple length spectrum. More recently, Duchin–Leininger–Rafi proved that a flat metric induced by a unit-norm quadratic differential is also determined by its marked simple length spectrum. In this talk, I will describe a generalization of the notion of simple curves to that of q-simple curves, for any positive integer q, and show that the lengths of q-simple curves suffice to determine a non-positively curved Euclidean cone metric induced by a q-differential metric.

Thursday, March 7, 2019

12:00 pm in 243 Altgeld Hall,Thursday, March 7, 2019

#### Atoroidal dynamics of subgroups of $$Out(F_N)$$

###### Caglar Uyanik (Yale)

Abstract: I will discuss several examples to illustrate how the dynamics of the $$Out(F_N)$$ action on various spaces reflects on the algebraic structure of the $$Out(F_N)$$ itself. In particular, I will talk about a new subgroup classification theorem for $$Out(F_N)$$ which is joint work with Matt Clay.