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 Events
UBC
Mon 2 Dec 2013, 3:10pm
CRG Geometry and Physics Seminar
ESB 4127 (host: UBC)
BCOV theory and Calabi-Yau 3-folds with two large complex structure limits
ESB 4127 (host: UBC)
Mon 2 Dec 2013, 3:10pm-4:10pm

Abstract

In their famous paper in 1994, Bershadsky, Cecotti, Ooguri and Vafa derived a set of equations called the BCOV holomorphic anomaly equations. The BCOV theory presents a generalization of the classical g=0 mirror symmetry (Hodge theory) and is capable of computing higher genus Gromov-Witten invariants. The key ingredient is the special Kaehler geometry of the moduli space of Calabi-Yau 3-folds. In this talk, I will explain the basic idea of the BCOV theory and show some interesting computations.
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UBC
Thu 5 Dec 2013, 3:30pm
Number Theory Seminar
room MATH 126
The Brauer-Manin obstruction for certain curves with split Jacobian
room MATH 126
Thu 5 Dec 2013, 3:30pm-4:30pm

Abstract

We discuss and show how to construct certain curves C of small genus satisfying the following conditions: (1) C is everywhere locally solvable; (2) the Jacobian of C is isogenous to the product of elliptic curves; (3) each elliptic curve factor in the Jacobian of C is of positive rank; (4) there is a Brauer-Manin obstruction for the failure of the Hasse principle for C. This is the joint work with Mike Bennett.
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Riverside
Mon 9 Dec 2013, 3:10pm
CRG Geometry and Physics Seminar
ESB 4127 (host: UBC)
Lagrangian-like submanifolds in Sympletic-like Poisson manifolds
ESB 4127 (host: UBC)
Mon 9 Dec 2013, 3:10pm-4:10pm

Abstract

The deformation theory of holomorphic symplectic manifolds and their Lagrangian submanifolds is well known to be well behaved, thanks to the influence of Hodge theory. We will report on recent work extending some of these results to certain Poisson manifolds and their Lagrangian-like submanifolds, using mixed Hodge theory.
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Dr. Sungho Yoon
University of Leeds, UK
Wed 11 Dec 2013, 4:00pm
Fluids Lab Meeting
LSK 203
Particle suspension in viscoelastic fluid and on mass transfer
LSK 203
Wed 11 Dec 2013, 4:00pm-5:00pm

Abstract

 The numerical simulation results in the three sections are presented based on the finite element method as below: 
 
1. Two particles interactions in Oldroyd-B fluid under confined shear are demonstrated  showing the three behavior types "pass", "return" and "tumbling" in functions of initial separation and Weissenberg number. The single fibre dynamics  is also presented with the slow motion showing the vorticity directional orientation in Oldroyd-B fluid and shear thinning fluid with Gisekus model.
 
2. The particle hydrodynamic effect on the mass transfer in the convection-diffusion problem are presented at Re=0 and Re=finitie. First, at Re=0, it is found that the disturbed streamlines on the convection enhance the mass transfer inducing the larger spectrum of the mass transfer area. Second, at Re>0, it is shown that the shear thickening phenomena by a inertial particle can promote the mass transfer on increasing effective viscosity. However, when Re_p is over critical value, it is also seen that inertial clustering particles being migrated in the region of low-vorticity by centifure-out can interrupt the mass transfer.
 
3. The mass transfer during the buoyant CO2 bubble absorption in a particle suspension is presented in terms of the experimental and computational studies. In both case, mass transfer enhancement (MTE) based on the mass transfer coefficient by the particle suspension is found. Especially, in numerical study, it is seen that the enhanced mass flux is highly influenced by the particle hydrodynamic interaction on the bubble surface. This can lead to declare a possible mechanism for MTE on a gas-absorption in a suspension.
 
In this talk, the briefly highlighted results are introduced in each section, not being included the numerical detail.
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Peter Overholser
Fields
Mon 16 Dec 2013, 3:10pm
CRG Geometry and Physics Seminar
ESB 4127 (host: UAlberta!)
A tropical descendent Landau-Ginzburg potential
ESB 4127 (host: UAlberta!)
Mon 16 Dec 2013, 3:10pm-4:10pm

Abstract

I will review Gross's tropical description of mirror symmetry for P2 and explain how its structures can be expanded to yield new tropical invariants.
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Vincent Chan and the Math Learning Centre (MLC) Committee
Mathematics, UBC
Mon 16 Dec 2013, 4:00pm
Mathematical Education
Math Annex (MATX) 1102
MLC End-of-Term Meeting
Math Annex (MATX) 1102
Mon 16 Dec 2013, 4:00pm-5:00pm

Abstract

We will discuss the operations of the MLC this term, including attendance statistics and feedback from students and TAs. All are welcome to attend.
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