6 citations · 15 across the 5 of their papers we have counts for
7 papers
Short time behavior of continuous time quantum walks on graphs
Balázs Endre Szigeti, Gábor Homa, Zoltán Zimborás +1
Dynamical evolution of systems with sparse Hamiltonians can always be recognized as continuous time quantum walks (CTQWs) on graphs. In this paper, we analyze the short time asympt…
Generalized quantum Zeno dynamics and ergodic means
Norbert Barankai, Zoltán Zimborás
We prove the existence of uniform limits for certain sequences of products of contractions and elements of a family of uniformly continuous propagators acting on a Hilbert or a Ban…
On the positivity preservation of the free Euclidean Dirac equation
Norbert Barankai
We show that the free Euclidean Dirac equation can preserve the positivity of its initial data only in two spacetime dimensions.
Spreading processes with a unique absorbing state and finite lifetime of populations
Norbert Barankai, József Stéger
The presence of a unique absorbing state in the finite state space of an epidemic process always poses a challenge in the definition of its epidemiological threshold. Without the e…
Regional properties of global communication as reflected in aggregated Twitter data
Zsofia Kallus, Norbert Barankai, Daniel Kondor +7
Twitter is a popular public conversation platform with world-wide audience and diverse forms of connections between users. In this paper we introduce the concept of aggregated regi…
Using Robust PCA to estimate regional characteristics of language use from geo-tagged Twitter messages
Dániel Kondor, István Csabai, László Dobos +6
Principal component analysis (PCA) and related techniques have been successfully employed in natural language processing. Text mining applications in the age of the online social m…
The effect of network structure on phase transitions in queuing networks
Norbert Barankai, Attila Fekete, Gábor Vattay
Recently, De Martino et al have presented a general framework for the study of transportation phenomena on complex networks. One of their most significant achievements was a deeper…