Joint UCI-UCSD Seminar: On the conical Kahler Ricci flow

Speaker: 

Yuanqi Wang

Institution: 

UC Santa Barbara

Time: 

Tuesday, May 21, 2013 - 4:00pm

Location: 

RH 340P

Inspired by Donaldson's program, we introduce the Kahler Ricci flow with conical singularities.  The main part of this talk  is to show that the conical Kahler Ricci flow exists for short time and for long time in a proper space. These existence results are hight related to heat kernel and Bessel functions. We will also discuss some easy applications of the conical Kahler Ricci flow in conical Kahler geometry.

Dissipation in Composities with High-Loss and Lossles Components

Speaker: 

Alex Figotin

Institution: 

UC Irvine

Time: 

Friday, May 3, 2013 - 4:00pm

Location: 

MSTB 120

We study the energy dissipation features of systems comprised of two components one of which is highly lossy and the other lossless. One of the principal results is that all the eigenmodes of any such system split into two distinct classes, high-loss and low-loss,according to their dissipative properties. Interestingly, this splitting is more pronounced the higher the loss of the lossy component. In addition to that, the real frequencies of the high-loss eigenmodes can become very small and even can vanish entirely, which is the case of overdamping. An exhaustive analytical study of the energy, dissipated power, and quality factor for such composite systems is given.

Quantization and Algebra

Speaker: 

Vladimir Baranovsky

Institution: 

UC Irvine

Time: 

Friday, April 26, 2013 - 4:00pm

Location: 

MSTB 120

Transition from Classical Mechanics to Quantum Mechanics involves replacing a certain commutative ring by its "non commutative deformation". We will discuss some algebraic aspects of this transition, and recent developments in algebra and algebraic geometry which are motivated by applications to quantum field theory

Using Forcing to Obtain a Model of the Continuum Hypothesis

Forcing is a method used to extend a transitive model M by adjoining a new set G in
order to obtain a larger transitive model M[G]. Our choice of partial order, or notion of
forcing, determines what is true in M[G]. We will consider the forcing introduced by Paul
Cohen in proving the independence of the Continuum Hypothesis. The Diamond Principle,
introduced by Jensen in 1972, can be thought of as a strengthening of the Continuum
Hypothesis. From a diamond sequence of length k we can read off all of the subsets of k.

Sets with no length, alternative axioms and infinite games

The length of a subset of the real line can be defined in mathematical terms. A set of real numbers is called "measurable" if a precise, definite length can be assigned to it, following certain desired natural properties. Surprisingly, from the axioms of Set Theory we can show the
existence of sets that are not measurable, somewhat violating our physical intuition of the notion of length in space. A natural logical question arises: can some axioms of Set Theory be replaced by different axioms that not only prohibit the existence of the pathological sets just

(Filtered, Phi)-modules in geometric families

Speaker: 

Ruochuan Liu

Institution: 

University of Michigan

Time: 

Thursday, April 11, 2013 - 2:00pm

Location: 

RH 440

This is a joint seminar with algebra seminar.
A classical result of Fontaine-Colmez in p-adic Hodge theory says that one can classify crystalline representations of Galois groups of p-adic fields using certain semi-linear objects, namely the weakly admissible (filtered, phi)-modules. In this talk we propose a notion of (filtered, phi)-modules over smooth adic spaces over p-adic fields, and give a characterization of their admissible locus. That is the part of the base where one can convert the (filtered, phi)-modules to crystalline local systems. This generalizes the works of Fontaine-Colmez, Berger andBrinon, and the work of Hartl on admissible locus of period domains.

Model-independent properties of the Fibonacci trace map and some applications

Speaker: 

William Yessen

Institution: 

UC Irvine

Time: 

Tuesday, April 16, 2013 - 1:00pm to 2:00pm

As is well known, a class of one-dimensional lattice models, such as Ising models, Jacobi and CMV operators and others, are susceptible to renormalization analysis that can be carried out via the transfer matrix formalism. As a result, models on the one-dimensional lattice of a certain quasi-periodic type (namely, those generated by primitive substitutions) can be studied via dynamics of so-called trace maps, which are polynomial maps acting on the real (or complex) Euclidean space of appropriate dimension. A prominent example is the widely studied Fibonacci model. Much work has been done in this direction. At some point it became apparent that a model-independent framework, based on the dynamics of trace maps, can be built, that would cover essentially all models the relevant information of which is encapsulated in the traces of the associated transfer matrices (and, as experience has shown, this information is very difficult if not impossible to obtain via techniques other than the trace map). The purpose of this talk is to give a broad overview of past and very recent results on the dynamics of the Fibonacci trace map in a model-independent fashion, motivated by a class of models from physics, and with a view towards applications to those models. We shall cover hyperbolicity and partial hyperbolicity of the trace map and implications in spectral theory of Jacobi operators; some applications to Ising models; recent advances in understanding invariant measures on the invariant hyperbolic sets and implications for the density of states measures for the Jacobi operators; the Newhouse phenomenon and mixed behavior with large (in the sense of Hausdorff dimension) chaotic sea, and some connections with kicked two-level systems. Time permitting, we shall also state some open problems.

Explicit zeta functions for a class of hyperelliptic curves

Speaker: 

Shuhong Gao

Institution: 

Clemson University

Time: 

Tuesday, May 7, 2013 - 2:00pm to 3:00pm

Host: 

Location: 

RH306

In this talk, we show how to explicitly determine the zeta functions of
hyperelliptic curves of the form $y^2 = x^p-ax-b$ defined over a finite
field $GF(p^s}$ where $p$ is a prime. Joint work with Hui Xue and Lin
You.

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