BEGIN:VCALENDAR
VERSION:2.0
PRODID:Mathematics Seminar Calendar
BEGIN:VEVENT
UID:20221005T191947-29376@math.msu.edu
DTSTAMP:20221005T191947Z
SUMMARY:Skew Products: Coactions You Can See
DESCRIPTION:Speaker\: Lucas Hall, MSU\r\nThe speaker introduces topological quivers and constructs their associated C*-algebra. We present two independent constructions which arise in the presence of a cocycle (the topological ”skew product" and the algebraic coaction) and show that the constructions agree in a suitable sense. Along the way, we characterize the skew product based on some associated topological dynamics. Time permitting, we will explore future directions.
LOCATION:C304 Wells Hall
DTSTART:20220906T150000Z
DTEND:20220906T155000Z
URL:https://math.msu.edu/Seminars/TalkView.aspx?talk=29376
END:VEVENT
BEGIN:VEVENT
UID:20221005T191947-29377@math.msu.edu
DTSTAMP:20221005T191947Z
SUMMARY:A Liouville-esque theorem for a weakly-defined derivation on B(H)
DESCRIPTION:Speaker\: Lara Ismert, Embry–Riddle Aeronautical University\r\nLiouville’s Theorem states that any bounded entire function on the complex plane is necessarily constant. In this talk, we discuss an analogous theorem for a weakly-defined derivation on B(H) studied in recent years by Erik Christensen. As a consequence, we provide new sufficient conditions for when two operators which satisfy the Heisenberg Commutation Relation must both be unbounded.
LOCATION:C304 Wells Hall
DTSTART:20220913T150000Z
DTEND:20220913T155000Z
URL:https://math.msu.edu/Seminars/TalkView.aspx?talk=29377
END:VEVENT
BEGIN:VEVENT
UID:20221005T191947-29419@math.msu.edu
DTSTAMP:20221005T191947Z
SUMMARY:Spectral estimates of dynamically-defined and amenable operator families (In collaboration with Siegfried Beckus)
DESCRIPTION:Speaker\: Alberto Takase, MSU and UC Irvine\r\nFor dynamically-defined operator families, the Hausdorff distance of the spectra is estimated by the distance of the underlying dynamical systems while the group is amenable.\r\nWe prove that if the group has strict polynomial growth and both the group action and the coefficients are Lipschitz continuous, then the spectral estimate has a square root behavior or, equivalently, the spectrum map is $\frac{1}{2}$-Holder continuous.\r\nWe prove the behavior can be improved resulting in the spectrum map being Lipschitz continuous if the coefficients are locally-constant.\r\nIn 1990, the square root behavior was established for the Almost Mathieu Operator or, more generally, the quasiperiodic operators with Lipschitz continuous potentials.\r\nOur results extend the square root behavior to a bigger class of operators such as (magnetic) discrete Schrodinger operators with finite range and with Lipschitz continuous coefficients.
LOCATION:C304 Wells Hall
DTSTART:20220920T150000Z
DTEND:20220920T155000Z
URL:https://math.msu.edu/Seminars/TalkView.aspx?talk=29419
END:VEVENT
BEGIN:VEVENT
UID:20221005T191947-29407@math.msu.edu
DTSTAMP:20221005T191947Z
SUMMARY:Generalized wreath products and rigidity of their von Neumann algebras
DESCRIPTION:Speaker\: Bin Sun, University of Oxford\r\nWe construct the first positive examples to the Connes' Rigidity Conjecture, i.e., we construct groups $G$ with Kazhdan's property (T) such that if $H$ is a group with the same von Neumann algebra as $G$, then $H\cong G$. In this talk, I will focus on the group-theoretic side of this result and talk about how we applied geometric group theory to solve problems from von Neumann algebra. This is joint work with Ionut Chifan, Adrian Ioana, and Denis Osin.\r\n
LOCATION:C304 Wells Hall
DTSTART:20221004T150000Z
DTEND:20221004T155000Z
URL:https://math.msu.edu/Seminars/TalkView.aspx?talk=29407
END:VEVENT
BEGIN:VEVENT
UID:20221005T191947-30448@math.msu.edu
DTSTAMP:20221005T191947Z
SUMMARY:Diffusion for a Quantum Particle in a Lindbladian Environment with a Periodic Hamiltonian
DESCRIPTION:Speaker\: Jacob Gloe, MSU\r\nA quantum particle restricted to a lattice of points has been well studied in many different contexts. In the absence of disorder or environmental interaction, the particle simply undergoes ballistic transport for many suitable Hamiltonian operators. Recently, progress has been made on introducing a Lindbladian interaction term to the model, which drastically changes the dynamics in the large time limit. We prove that indeed diffusion is present in this context for an arbitrary periodic Hamiltonian. Additionally, we show that the diffusion constant is inversely proportional to the particles' coupling strength with its environment.\r\n
LOCATION:C304 Wells Hall
DTSTART:20221011T150000Z
DTEND:20221011T160000Z
URL:https://math.msu.edu/Seminars/TalkView.aspx?talk=30448
END:VEVENT
BEGIN:VEVENT
UID:20221005T191947-30450@math.msu.edu
DTSTAMP:20221005T191947Z
SUMMARY:TBA
DESCRIPTION:Speaker\: Lubashan Pathirana, MSU\r\n
LOCATION:C304 Wells Hall
DTSTART:20221018T150000Z
DTEND:20221018T160000Z
URL:https://math.msu.edu/Seminars/TalkView.aspx?talk=30450
END:VEVENT
BEGIN:VEVENT
UID:20221005T191947-30455@math.msu.edu
DTSTAMP:20221005T191947Z
SUMMARY:TBA
DESCRIPTION:Speaker\: Giorgio Young, University of Michigan\r\n
LOCATION:C304 Wells Hall
DTSTART:20221101T150000Z
DTEND:20221101T160000Z
URL:https://math.msu.edu/Seminars/TalkView.aspx?talk=30455
END:VEVENT
BEGIN:VEVENT
UID:20221005T191947-29431@math.msu.edu
DTSTAMP:20221005T191947Z
SUMMARY:TBA
DESCRIPTION:Speaker\: Renaud Requipas, NYU\r\n
LOCATION:C304 Wells Hall
DTSTART:20221129T160000Z
DTEND:20221129T170000Z
URL:https://math.msu.edu/Seminars/TalkView.aspx?talk=29431
END:VEVENT
END:VCALENDAR