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In the context of the energy landscape description of supercooled liquids, wepropose an explanation for the different behaviour of fragile and strongliquids. Above the Goldstein crossover temperature Tx, diffusion is interpretedas a motion in the phase space among unstable stationary points of thepotential energy, that is among saddles. In this way two mechanisms ofdiffusion arise: mechanism A takes place when the system crosses potentialenergy barriers along stable uphill directions, while mechanism B consists infinding unstable downhill directions out of a saddle. Depending on the mutualvalue of the efficiency temperatures of A and B, we obtain two very differentbehaviours of the viscosity, reproducing the usual classification of liquids infragile and strong. Moreover, this scenario very naturally predicts thepossibility of a fragile-to-strong crossover when lowering the temperature.Comment: Revised versio

Fragile vs . strong liquids: A saddles-ruled scenario