János Kertész

Central European University


Janos Kertesz

Thursday 12th June 2014, 2:10pm


TITLESpreading on temporal networks

ABSTRACT | Spreading is one of the most important processes taking place on networks with relevance to epidemiology, computer science and sociology. Investigating Big Data has revealed that the transmission events are usually very inhomogeneously distributed: They are bursty, thus theories based on Poisson processes fail. A careful analysis of the communication events revealed strong, nontrivial dependency between them. We have studied spreading on communication networks and analyzed the different contributions influencing the speed of contagion using appropriate null models. The result is that burstiness and modular structure coupled with the Granovetterian correlations between link weights and topology have decelerating effect on spreading. However, in some other cases acceleration as compared to Poisson processes were observed. In order to get deeper understanding we carried out analytical and numerical model calculations of the susceptibleinfected (SI) model on temporal networks and obtained a complex picture with both acceleration and deceleration, depending on the burstiness, the topology and the nonstationarity of the process.

BIOGRAPHY | János Kertész obtained his PhD in Physics 1980 from Eötvös University. He worked at the Research Institute of Technical Physics of the Hungarian Academy of sciences, at the Cologne University and at Technical University Munich. He has been professor since 1992 at the Budapest University of Technology and Economics, and since 2012 at the Center for Network science of the Central European University. He was visiting scientist in Germany, US, France, Italy and Finland. He is interested in statistical physics and its applications. During the last 15 years his research has focused on multidisciplinary topics, mainly on complex networks as well as on financial analysis and modeling. He has published more than 200 scientific papers. He has been on the editorial boards of Journal of Physics A, Physica A, Fluctuation and Noise Letters, Fractals, New Journal of Physics. His work has been awarded with the Hungarian Academy Award, the SzentGyorgyi Award of the Ministry of Education and Culture, and the Széchenyi Prize.