Dr. Vahan Nanumyan


+41 44 632 84 78

ETH Zurich
Vahan Nanumyan
Chair of Systems Design
WEV G 213
Weinbergstrasse 56/58
8092 Zurich

The PhD programme I am undertaking has two key aspects. One is extending the methodology of multi-layer and multiplex networks, in particular by means of statistical physics toolset. The other aspect of the programme is the application of these methods to problems of sociotechnical systems, which can be described as comprising information and social components, or layers. Collaboration and citation networks of researchers in science and inventors in R&D are prominent examples of such systems.

In addition, I am interested in the topic of network inference. In many situations where connections between involved parts are crucial, we don't know exactly who interacts with whom. A good example is the over-the-counter derivative market. The ties (contracts) between banks are not explicitly known. However, the network of these ties is known to be an important, if not the most, factor in systemic risk.


Publications in

Quantifying Triadic Closure in Multi-Edge Social Networks

Brandenberger, Laurence; Casiraghi, Giona; Nanumyan, Vahan; Schweitzer, Frank

Generalised hypergeometric ensembles of random graphs: The configuration model as an urn problem

Casiraghi, Giona; Nanumyan, Vahan



From Relational Data to Graphs: Inferring Significant Links Using Generalized Hypergeometric Ensembles

Casiraghi, Giona; Nanumyan, Vahan; Scholtes, Ingo; Schweitzer, Frank

SocInfo 2017, pages: 111--120


Generalized Hypergeometric Ensembles: Statistical Hypothesis Testing in Complex Networks

Casiraghi, Giona; Nanumyan, Vahan; Scholtes, Ingo; Schweitzer, Frank

ArXiv e-prints


A conceptual approach to model co-evolution of urban structures

Schweitzer, Frank; Nanumyan, Vahan

International Journal of Space Structures, pages: 43-51, volume: 31, number: 1


The Network of Counterparty Risk: Analysing Correlations in OTC Derivatives

Nanumyan, Vahan; Garas, Antonios; Schweitzer, Frank

PLOS ONE, pages: e0136638, volume: 10


How do OSS projects change in number and size? A large-scale analysis to test a model of project growth

Schweitzer, Frank; Nanumyan, Vahan; Tessone, Claudio Juan; Xia, Xi

ACS - Advances in Complex Systems, pages: 1550008, volume: 17, number: 07n08




Model selection for coupled growth of multi-layer networks [May 30, 2019 - May 30, 2019]

NetSci 2019

Inferring Signed Relations from Repeated Interactions [Oct. 20, 2017]

NSF-FAST Workshop on Machine Learning


Inferring weighted signed relations from repeated interactions [Jan. 17, 2017]

NetSciX 2017, Tel Aviv, Israel


Generalized hypergeometric ensembles: statistical hypothesis testing in complex networks [Jan. 16, 2017]

NetSciX 2017, Tel Aviv, Israel

publication| link

Inferring Weighted Signed Relations from Repeated Interactions [July 12, 2016]

Complex Networks 2016


Network Science: from corporate control to 'malicious' Facebook friends [Aug. 8, 2014]

Public Lecture at American University of Armenia, Yerevan, Armenia