Department of

# Mathematics

Seminar Calendar
for events the day of Monday, January 28, 2019.

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events for the
events containing

Questions regarding events or the calendar should be directed to Tori Corkery.
    December 2018           January 2019          February 2019
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1          1  2  3  4  5                   1  2
2  3  4  5  6  7  8    6  7  8  9 10 11 12    3  4  5  6  7  8  9
9 10 11 12 13 14 15   13 14 15 16 17 18 19   10 11 12 13 14 15 16
16 17 18 19 20 21 22   20 21 22 23 24 25 26   17 18 19 20 21 22 23
23 24 25 26 27 28 29   27 28 29 30 31         24 25 26 27 28
30 31


Monday, January 28, 2019

3:00 pm in 243 Altgeld Hall,Monday, January 28, 2019

#### Circle actions on almost complex manifolds with few fixed points

###### Donghoon Jang (Pusan National University)

Abstract: A circle action on a manifold can be thought of as a periodic flow on a manifold (periodic dynamical system), or roughly a rotation of a manifold. During this talk, we consider circle actions on almost complex manifolds, which are more general than symplectic manifolds. We discuss classification of a circle action on a compact almost complex manifold $M$, when the number $k$ of fixed points is small. If $k=1$, $M$ is a point. If $k=2$, $M$ resembles $S^2$ or $S^6$. If $k=3$, $M$ resembles $\mathbb{CP}^2$. We also discuss when $k=4$ and $\dim M \leq 6$. Techniques include equivariant cohomology and index theory.

5:00 pm in 241 Altgeld Hall,Monday, January 28, 2019

#### Quantum Null Energy Conjecture

###### Tom Faukner (UIUC physics)

Abstract: We will explain and discuss a recent result on the Quantum Null Energy Conjecture