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## January 30, 2018

#### Tuesday, January 30, 2018

Thesis Defense Seminar
11:00 AM - 12:00 PM

Bloomberg School of Public Health

Family Centered Rounds: Understanding Daily Practice and the Impact on Family Experience Deborah Waltermire-Burton, DrPH Candidate Department of Health, Policy and Management
Human Nutrition Seminar
12:15 PM - 1:15 PM

Bloomberg School of Public Health

"Collection of population-based nutrition data: current practices and emerging challenges" Sorrel Namaste, DrPH MHS Senior Nutrition Technical Advisor The Demographic and Health Surveys Program
Biostatistics Help: Faculty, Staff, Pre-MD and Post-Doc Walk-In Clinic
1:00 PM - 2:00 PM

Biostatistics consulting is available to all Johns Hopkins University faculty, staff, pre-MDs and post-docs conducting clinical and translational research. 1:00 – 2:00 PM Wolfe Street Building Room: E3144
CTL Instructional Design Drop-In Office Hours
1:00 PM - 4:00 PM

Faculty and TAs can meet with the CTL Instructional Designers to discuss course design or CoursePlus questions. No appointment required. Wolfe W9514
Thesis Defense Seminar
1:00 PM - 2:00 PM

Bloomberg School of Public Health

Arsenic, Targeted Metabolomics and Diabetes Related Outcomes: Connecting the Dots in the Strong Heart Study Miranda Jones Spratlen, PhD Candidate Department of Environmental Health and Engineering
Aurelien Sagnier "An arithmetic site of Connes-Consani type for Gaussian integers"
3:00 PM - 4:00 PM

Homewood

Speaker: Aurelien Sagnier Abstract:"We are used to see integers with the usual structure of ordered ring $(\mathbb{Z},+,\times,\leq)$. A.Connes and C.Consani proposed in 2014 to look at them with an other structure which is $(\mathbb{Z},\max,+)\circlearrowleft\mathbb{N}^\star$ ie the idempotent semiring $(\mathbb{Z},\max,+)$ with an action of $\mathbb{N}^\times$ (the positive integers) by multiplication. With the eyes of algebraic geometry, it is a semiringed topos whose points are linked with Riemann zeta function. The hope in the long term is that this new framework coming from algebraic geometry could help translating ideas of the demonstration of the analogue of Riemann hypothesis for zeta functions associated to smooth projective curves over a finite field to the actual Riemann zeta function. I will explain A.Connes' and C.Consani's point of view in the first part of my talk. However this point of view heavily relies on $\leq$ the natural order on $\mathbb{R}$ compatible with addition and mutltiplication so one may wonder if for Gaussian integers, where nothing of this sort exists, one can adapt the ideas and the methods of A.Connes and C.Consani. This is what i have done in my PhD thesis and what I will explain in the second part of my talk."
Nero Budur "Special properties of some homotopy invariants of algebraic varieties."
4:30 PM - 5:30 PM

Homewood

Speaker: Nero Budur, KU Leuven Abstract: Cohomology and fundamental groups are the most widely studied homotopy invariants of algebraic varieties. In this talk, we consider other invariants, the cohomology jump loci of local systems. For rank one local systems, there is a flurry of recent activity. In this talk we show that if an irreducible complex algebraic variety has no weight zero 1-cohomology classes, then the irreducible components of the cohomology jump loci of rank one local systems containing the constant sheaf are complex affine tori. This implies restrictions on the fundamental group. In contrast, by work of Simpson, Kollár-Kapovich, every finitely generated group can be the fundamental group of a complex algebraic variety with simple normal crossing singularities. For higher-rank local systems on smooth varieties, we have a conjecture, analogous to the André-Oort conjecture, to the effect that cohomology jump loci are "special" and the "special" local systems come from geometry. The conjecture holds for the rank one case, where "special" turns out to mean a torsion-translated complex affine torus. Joint work with Marcel Rubió and Botong Wang.

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