Boris Vallee (Harvard Business School)
FinTech Lending and Cashless Payments abstract
Abstract:
We uncover an informational synergy between FinTech lending and cashless payments. Theoretically, FinTech lenders screen borrowers more efficiently when borrowers use cashless payments that produce transferable and verifiable information. In turn, a strategic consideration to stand out from non-adopting borrowers pushes borrowers to adopt cashless payments. Empirically, a larger use of cashless payments predicts a higher likelihood of loan approval, a lower interest rate, and a higher loan amount, especially for firms of higher credit quality. This synergy provides an economic rationale for open banking, and more broadly for data sharing and a lending model without traditional banking relationships.
10:30 • EPF Lausanne, UniL campus, Extranef 126
Elena Moral Sánchez (Max-Planck Institute for Plasma Physics)
The cold-plasma model and simulation of wave propagation using B-Spline Finite Elements abstract
Abstract:
The cold-plasma wave equation describes the propagation of an electromagnetic wave in a magnetized plasma, which is an inhomogeneous, dispersive and anisotropic medium. The thermal effects are assumed to be negligible, which leads to a linear partial differential equation. Besides, we assume that the electromagnetic field of the propagating wave is in the time-harmonic regime.This model has applications in magnetic confinement fusion devices, like the Tokamak. Namely, electromagnetic waves are used to heat up the plasma (Electron cyclotron resonance heating (ECRH)) or for interferometry and reflectometry diagnostics (to measure plasma density and position, etc.).
In the first part of this talk, we introduce the cold-plasma model, together with a qualitative study of the plasma modes which expose the complexity of the problem.In the second part, we describe the problem and the simplifications we carry out, which yield the indefinite Helmholtz equation. It is solved with B-Spline Finite Elements provided by the Psydac library and some results are shown. Lastly, we discuss the performance and potential ways of preconditioning.
11:00 • Universität Basel, Spiegelgasse 5, SR 05.002
Prof. Dr. Martin Raum (Chalmers Technical University, Gothenburg)
Polyharmonic Maass forms and cyclic representations of the Gelfand quiver abstract
Abstract:
Polyharmonic Maass forms are generalizations of classical elliptic modular forms that obey weaker differential equations than the Cauchy-Riemann equations, and thus form a richer class of functions which accommodate, for instance, some generating series of period integrals. Their differential properties are captured by cyclic Harish-Chandra modules, which are in ono-to-one correspondence with cyclic representations of the two-cyclic and the Gelfand quiver. We show that all latter representations arise from polyharmonic Maass forms, and provide a explicit construction, which has a natural interpretation in terms of tensor products of Harish-Chandra modules.
14:15 • ETH Zentrum, Rämistrasse 101, Zürich, Building HG, Room G 43
Prof. Dr. Irfan Glogic (Universität Wien)
Title T.B.A.
14:15 • EPF Lausanne, Salle MA B2 485
Peter Orbanz (UCL)
Statistical implications of group invariance of distributions abstract
Abstract:
Consider a large random structure -- a random graph, a stochastic process on the line, a random field on the grid -- and a function that depends only on a small part of the structure. Now use a family of transformations to ‘move’ the domain of the function over the structure, collect each function value, and average. Under suitable conditions, the law of large numbers generalizes to such averages; that is one of the deep insights of modern ergodic theory.
The work I will present here shows that central limit theorems and other higher-order properties also hold. Loosely speaking, if the i.i.d. assumption of classical statistics is substituted by suitable properties formulated in terms of groups, the fundamental theorems of inference still hold.
15:15 • EPF Lausanne, Salle GA 3 21
Prof. Dr. Vivek Shende (UC Berkeley and Uniersity of Southern Denmark)
Skein valued mirror symmetry abstract
Abstract:
We show how, at least in some class of examples ("Reeb-positive"), the all-genus skein-valued curve count on a non-compact Lagrangian (e.g. a Harvey-Lawson brane in a toric CY3) is annihilated by an operator equation which is a skein-valued quantization of the mirror curve. As an application we prove the all-color version of the Ooguri-Vafa conjecture mentioned above.
16:00 • ETH Zentrum, Rämistrasse 101, Zürich, Building HG, Room G 43