Institute for Cross-Disciplinary Physics and Complex Systems

Can we define climate by means of an ensemble? A tale of time scales of convergence

Abstract. We study the suitability of an initial condition ensemble to form the conceptual basis of defining climate. We point out that the most important criterion for this is the uniqueness of the probability measure on which the definition relies. We first naively propose, in...

When one protocol fits none: Self-organized network routing through evolutionary game dynamics

Packet routing on scale-free networks faces a fundamental trade-off: shortest-path routing is efficient at low demand but funnels traffic through hubs and jams early, whereas congestion-aware routing postpones jamming at the price of a sharper collapse. Since neither paradigm dom...

Observational indistinguishability between classical diffusion and thermal quantum propagation on networks

Abstract The heat kernel of a graph Laplacian is widely used to describe diffusion, transport, correlations and geometry in complex networks. In this work, we show that the same heat-kernel operator emerges both as the propagator of classical diffusion on a network and as the the...

Observation of erratic non-Hermitian skin localization and transport

Abstract Localization is a pervasive phenomenon across physics, shaping transport from electrons in solids to light and sound in engineered media. In traditional settings, disorder strongly impedes transport, resulting in dynamical localization or, at best, sub-ballistic or diffu...

Stochastic thermodynamics of social imitation beyond energetics

The development of stochastic thermodynamics during the last decades prompted the discovery of nonequilibrium relations refining our understanding of the second law in small fluctuating systems and its connection with information theory. A fundamental open question is whether the...