MenuEvents for 04/22/2015 from all calendars
Number Theory Seminar
Time: 1:45PM - 2:45PM
Location: BLOC 220
Speaker: David Lowry-Duda, Brown University
Title: Bounding Sums of Fourier Coefficients of Modular Forms
Abstract: Understanding the sizes of Fourier coefficients of modular forms has been always been a central goal of the theory of modular forms. In this talk, we try to understand the size of the sum of the first several Fourier coefficients of full or half-weight forms. There is a Classical Conjecture analogous to the celebrated Ramanujan-Petersson conjecture, but it is not yet known in any case. We will show that the Classical Conjecture is true on average, and show how this result gives related results on sign changes. This talk is based on joint works with T. Hulse, C. Kuan, and A. Walker.
URL: Event link
Noncommutative Geometry Seminar
Time: 2:00PM - 2:50PM
Location: BLOC 628
Speaker: Xiang Tang, Washington University
Title: A K-homology class associated to symplectic cohomology
Abstract: Recently, Tseng and Yau introduced an interesting cohomology theory on symplectic manifolds. In this talk, we will discuss some prelimary study of this cohomology using K-homology. This is work in progress with Li-Sheng Tseng.
Groups and Dynamics Seminar
Time: 3:00PM - 4:00PM
Location: BLOC 220
Speaker: Sang Rae Lee, Texas A&M University
Title: Finiteness property of subgroups of the symmetric group on Z
Abstract: Consider subgroups of the symmetric group on Z consisting of eventually periodic maps. In this talk we study their finiteness properties. We show that each of those groups has type F_{n-1} but not F_n for some positive integer n. We also show that this class of groups contains Houghton's groups.
Noncommutative Geometry Seminar
Time: 4:00PM - 5:00PM
Location: BLOC 220
Speaker: Amnon Neeman, Australian National University
Title: Separable monoids come from etale covers
Abstract:
Given a monoidal category (a category with a tensor product), it is possible to define what it means for an object to be an "separable monoid". We will recall the definition. In the category of modules over a commutative ring the concept is classical and has been studied extensively, with literature going back to the 1960s.
Recently Balmer and some collaborators started the study of separable monoids in any tensor triangulated category; we will recall some of the recent theorems. The main new result I will present says [among other things] that, in the derived category of modules over a noetherian commutative ring, any COMMUTATIVE separable monoid must come from an etale extension of the ring. We will explain this precisely.
Of course there are plenty of noncommutative separable monoids, and the question I would like to draw attention to, in this talk, is what should be the correct general statement.First Year Graduate Student Seminar
Time: 5:30PM - 6:30PM
Location: BLOC 628
Speaker: Peter Howard
Title: Summer 2015 and the years ahead
AMUSE
Time: 6:00PM - 7:00PM
Location: BLOC 117
Speaker: Dr. Alan Demlow, Texas A&M University, Department of Mathematics
Title: Mathematical Modeling of a Zombie Infection Outbreak
Abstract: Zombie outbreaks are widely recognized in pop culture outlets as one of the greatest menaces facing our civilization in the upcoming century. (More respectable authorities often seem blithely unaware of the gravity of the threat, for some reason…) It is less widely known that ordinary differential equations can be used to model the dynamics of such outbreaks, and thus to create an effective plan to battle them. In order to understand the properties of zombies, we will first consult some primary source materials such as the movie “Night of the Living Dead". Then we’ll use differential equations to construct a model that predicts population shifts during a zombie outbreak. This will allow us to figure out who wins in the end, us or the zombies. The talk will be accessible to calculus students who understand that a derivative represents a rate of change.
