Tidligere arrangementer - Side 43

A finite graph determines a Kirchhoff polynomial, which is a squarefree, homogeneous polynomial in a set of variables indexed by the edges. The Kirchhoff polynomial appears in an integrand in the study of particle interactions in high-energy physics, and this provides some incentive to study the motives and periods arising from the projective hypersurface cut out by such a polynomial.

From the geometric perspective, work of Bloch, Esnault and Kreimer (2006) suggested that the most natural object of study is a polynomial determined by a linear matroid realization, for which the Kirchhoff polynomial is a special case.

I will describe some ongoing joint work with Delphine Pol, Mathias Schulze, and Uli Walther on the interplay between geometry and matroid combinatorics for this family of objects.

QOMBINE seminar by Roy Araiza (University of Illinois Urbana-Champaign)

Legend has it that the capoeira player Besouro Mangang¨¢ summoned Bahia¡¯s full magical power to seal his body from harm. Neither bullet nor knife could pierce his skin anymore.

By Franck L. P. Lejzerowicz, Postdoc at AQUA, IBV

Innovations in fluid mechanics are leading to better food since ancient history, while creativity in cooking inspires applied and fundamental science. In this talk, I will discuss how recent advances in hydrodynamics are changing food science, and how the surprising phenomena that arise in the kitchen lead to discoveries and technologies across the disciplines, including rheology and soft matter. Central topics include cocktails and champagne (multiphase flows), whipped cream (complex fluids) and pancake making (viscous flows). For every topic, I will present the state-of-the-art knowledge, the open problems, and likely directions for future research.

Publications:
Mathijssen, A. J., Lisicki, M., Prakash, V. N., & Mossige, E. J. (2023). Culinary fluid mechanics and other currents in food science. Reviews of Modern Physics, 95(2), 025004.

Fuller, G. G., Lisicki, M., Mathijssen, A. J., Mossige, E. J., Pasquino, R., Prakash, V. N., & Ramos, L. (2022). Kitchen flows: Making science more accessible, affordable, and curiosity driven. Physics of Fluids, 34(11).

Sigurd K. N?ss, Researcher at Institute of Theoretical Astrophysics, University of Oslo.

Department seminar. Sebastian Siegloch is a Professor of Economics at the University of Cologne.

Felleskollokvium by Dr. Antoine Camper, Dept. of Physics, UiO

C*-algebra seminar talk by Valerio Proietti (University of Oslo)

On the 12th and 13th of September 2023 Ariane Dupont-Kieffer will give four lectures about the history of econometrics and the specific contributions of Frisch and Haavelmo in the formative period of econometrics as discipline specific methodology. The lectures are open to all interested.

Congo Calling is a patient, empathetic but clear-sighted if not disillusioned film about three people of European and American origin, who work in Eastern Congo in the present. The main character is a young US American social science PhD student, which makes the film particularly relevant for us.  The film invites us to discuss the concept of 'Africa', and critically engage with European (and US American, and other privileged) modes of imagining and acting in 'Africa'.

On the 12th and 13th of September 2023 Ariane Dupont-Kieffer will give four lectures about the history of econometrics and the specific contributions of Frisch and Haavelmo in the formative period of econometrics as discipline specific methodology. The lectures are open to all interested.

Department seminar. Danial Ali Akbari is an Assistant Professor at the Department of Economics, University of Oslo. He will present the paper: "Technology Adoption and Human Capital Accumulation."

By Sally Otto and Michael Whitlock from the University of British Columbia, Vancouver, Canada

Abstract: TBA

Ragnhild Aurvik, Ph.D student at Institute of Theoretical Astrophysics, University of Oslo.

In this talk, I explain how we explicitly construct a motivic analog of the fundamental group of the circle. We construct a group structure on the set of pointed naive homotopy classes of maps from the Jouanolou device to the projective line. The group operation is defined via matrix multiplication on generating sections of line bundles and only requires basic algebraic geometry. In particular, it is completely independent of the construction of the motivic homotopy category. Based on joint work with William Hornslien, Gereon Quick, and Glen Matthew Wilson.

Department seminar. Johannes Spinnewijn is a Professor of Economics at London School of Economics. He will present the paper: "The Chronic Condition Index: Analyzing Health Inequalities Over the Lifecycle" (written with Kaveh Danesh, Jon Kolstad and Will Parket).

QOMBINE seminar talk by Ruben Bassa (SINTEF)

Rafiki (Swahili for ¡®friend¡¯) is a Kenyan drama, made for popular audiences by filmmaker Wanuri Kahiu. 

Department seminar. Giacomo Brusco is an Assistant Professor at the Department of Economics, University of T¨¹bingen. He will present the paper: "Guess Who's Evading on Dinner: Experimental Evidence on the Incidence of Tax Evasion."

Carlos A.R. Herdeiro, Professor in the Gravitational Geometry and Dynamics Group, Mathematics Department, Aveiro University (Portugal).