Seminar 11 December: Michele Aleandri "Interaction on graphs: dynamics and normative aspects"

11 December 2025 - 11:30 am - Common Room

Michele Aleandri (LUISS) "Interaction on graphs: dynamics and normative aspects".

Abstract

This seminar illustrates how graphs provide a versatile framework for modeling interaction, coordination, and long-term behavior in complex systems. We consider several classes of models in which agents’ decisions evolve through reinforcement, social influence, cooperation, or rare-event dynamics, and show how the underlying network structure governs stability, convergence, and the emergence of norms. Reinforced dynamics highlight how graph topology shapes collective limits; models of social influence reveal how local interactions can trigger global shifts in normative behavior; collaboration networks show how power and coherence depend on structural position; and large-deviation regimes in stochastic systems demonstrate how graphs guide asymptotic selection mechanisms. Taken together, these perspectives show how diverse phenomena, ranging from normative change to technological cooperation and metastable behavior, can be understood through a common graph-based viewpoint.