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--- seminars:colloquium:y2019-2020 [2022/04/29 00:31] – created tongviet
+++ seminars:colloquium:y2019-2020 [2022/04/29 00:41] (current) – tongviet
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+====== Colloquium 2019-2020======
+Unless stated otherwise, colloquia are scheduled for Thursdays 4:15-5:15pm in WH-100E with refreshments served from 4:00-4:15 pm in WH-102.
+Organizers: [[people:kargin:start|Vladislav Kargin]], [[people:malkiewich:start]], [[people:anton:start]],
+and [[people:adrian:start]]
+------
+==== Spring 2020 ====
+**Friday January 31, 4:30-5:30pm, WH-100E (NOTE SPECIAL DATE AND TIME)**\\  //Speaker//: ** [[ https://sites.google.com/view/studenmund/home | Daniel Studenmund]] ** (University of Notre Dame) \\ //Topic//: Hidden symmetries of groups \\
+<WRAP box 90%>
+//Abstract//:
+Many infinite discrete groups fail to have nice properties only
+because of obstructions that disappear on passage to a finite-index
+subgroup. Examples of such properties include superrigidity of
+representations of linear groups and nilpotence of groups of polynomial
+growth. The collection of all finite-index subgroups of a fixed group
+Gamma has algebraic and geometric structures that can reflect properties
+of Gamma. We will discuss some of these structures, including the abstract
+commensurator of Gamma and commensurator growth of Gamma. \\
+</WRAP>
+**Thursday February 6, 4:15-5:15pm**\\  //Speaker//: ** [[ https://sites.google.com/site/sukhtaievs/ | Selim Sukhtaiev]] ** (Rice University) \\ //Topic//: Anderson localization for disordered quantum graphs \\
+<WRAP box 90%>
+//Abstract//:
+Disorder is one of the central topics in modern science.
+In this talk, we will discuss a mathematical treatment of a particular
+disordered system modeling localization of quantum waves in random media.
+The model in question was introduced by P. W. Anderson in his Nobel prize
+winning work in physics which led to a rich mathematical theory of random
+Schrodinger operators.  We will show that the transport properties of several
+natural Hamiltonians on metric trees with random branching numbers are
+suppressed by disorder. This phenomenon is called Anderson localization. \\
+</WRAP>
+**Friday February 7, 4:30-5:30pm (NOTE SPECIAL DATE AND TIME)**\\  //Speaker//: ** [[ https://lichen-math.weebly.com/ | Li Chen]] ** (University of Connecticut) \\ //Topic//: On several functional inequalities for Markov semigroups and their
+applications \\
+<WRAP box 90%>
+//Abstract//:
+Markov semigroups lie at the interface of analysis, PDEs,
+probability and geometry. Markov semigroup techniques, from both analytic
+and probabilistic viewpoints, have important applications in the study of
+functional inequalities coming from harmonic analysis, PDEs and geometry.
+In this talk, we discuss regularization properties of heat semigroups and
+their applications to the study of Sobolev type inequalities, isoperimetric
+inequalities and $L^p$ boundedness of Riesz transforms in different
+geometric settings. Fractal examples without differential structures are
+emphasized. Besides, we also discuss sharp and  dimension-free $L^p$ bounds
+of singular integral operators via the martingale transform method. \\
+</WRAP>
+**Monday February 10**\\  //Speaker//: ** [[ https://users.math.msu.edu/users/schmidt/ | Benjamin Schmidt]] ** (Michigan State University) \\ //Topic//:  Preserve one, preserve all: Aleksandrov's problem in the context of Riemannian spaces.\\
+<WRAP box 90%>
+//Abstract//:
+A classical theorem of Beckman and Quarles asserts that a function
+$F$ from a Euclidean space of dimension at least two to itself and having the
+property that $||F(x)-F(y)||=1$ whenever $||x-y||=1$ is necessarily an isometry.
+Aleksandrov has been credited with the problem of determining those metric
+spaces having this "preserve one distance, then preserve all distances"
+property.
+Examples show that Riemannian manifolds need not have this property.
+However, it is expected that self-functions of complete Riemannian
+manifolds that preserve a sufficiently small distance are isometries.
+I'll formulate a precise conjecture and will discuss supporting results
+proved jointly with Meera Mainkar. \\
+</WRAP>
+**Thursday March 19, 4:15-5:15pm, WH-100E**\\  //Speaker//: ** [[ https://math.cornell.edu/kathryn-mann | Kathryn Mann]] ** (Cornell University) \\ //Topic//: TBA \\
+<WRAP box 90%>
+//Abstract//:
+TBA \\
+</WRAP>
+**Thursday April 23, 4:15-5:15pm, WH-100E**\\  //Speaker//: ** [[ https://physics.cornell.edu/thomas-hartman | Thomas Hartman]] ** (Cornell University) \\ //Topic//: TBA \\
+<WRAP box 90%>
+//Abstract//:
+TBA \\
+</WRAP>
+**PETER HILTON MEMORIAL LECTURE** \\ **Thursday April 30, 3:00-4:00pm, LH009 (NOTE SPECIAL TIME AND LOCATION)** \\ //Speaker:// **[[ https://web.ma.utexas.edu/users/gompf/ | Robert Gompf]]** (University of Texas at Austin) \\ //Topic:// Exotic Smooth Structures on $\mathbb R^4$
+<WRAP box 90%>//Abstract: //One of the most surprising discoveries in 4-manifold topology was the existence of smooth manifolds homeomorphic, but not diffeomorphic, to Euclidean 4-space. For fundamental reasons, this phenomenon can only occur in 4 dimensions. We will survey the subject, from its origin to recent developments regarding symmetries of such manifolds.\\
+ </WRAP>
+-----
+Archive:
+/*  * [[http://www.math.binghamton.edu/dept/colloquia/old.html|1996-2013]] */
+/*  * [[http://www.math.binghamton.edu/dept/colloquia/index.html|2013-2014]] */
+  * [[seminars:colloquium:2014_2015|2014-2015]]
+  * [[seminars:colloquium:y2015_2016|2015-2016]]
+  * [[seminars:colloquium:y2016_2017|2016-2017]]
+  * [[seminars:colloquium:y2017-2018|2017-2018]]
+  * [[seminars:colloquium:y2018-2019|2018-2019]]