Université de Fribourg

Nobody’s Innocent : The Role of Customers in the Doping Dilemma

Buechel, Berno ; Emrich, Eike ; Pohlkamp, Stefanie

In: Journal of sports economics, 2016, vol. 17, no. 8, p. 767-789

Customers who boycott an organization after some scandal may actually exacerbate the fraud problem they would like to prevent. This conclusion is derived from a game- theoretic model that introduces a third player into the standard inspection game. Focusing on the example of doping in professional sports, we observe that doping is prevalent in equilibrium because customers undermine an...

Université de Fribourg

Electron doping and superconductivity in the two-dimensional Hubbard model

Eichenberger, David ; Baeriswyl, Dionys

In: Physical Review B, 2009, vol. 79, no. 10, p. 100510(R)

An elaborate variational wave function is used for studying superconductivity in the (repulsive) two-dimensional Hubbard model, including both nearest- and next-nearest-neighbor hoppings. A marked asymmetry is found between the “localized” hole-doped region and the more itinerant electron-doped region. Superconductivity with d-wave symmetry turns out to be restricted to densities where...