Spinodal instability growth in new stochastic approaches
1 IPN, CNRS/IN2P3, Université Paris-Sud 11, 91406 Orsay, France
2 INFN-LNS, Laboratori Nazionali del Sud, 95123 Catania, Italy
3 SUBATECH, EMN-IN2P3/CNRS-Université de Nantes, 44307 Nantes, France
Published online: 24 April 2015
Are spinodal instabilities the leading mechanism in the fragmentation of a fermionic system? Numerous experimental indications suggest such a scenario and stimulated much effort in giving a suitable description, without being finalised in a dedicated transport model.
On the one hand, the bulk character of spinodal behaviour requires an accurate treatment of the one-body dynamics, in presence of mechanical instabilities. On the other hand, pure mean-field implementations do not apply to situations where instabilities, bifurcations and chaos are present. The evolution of instabilities should be treated in a large-amplitude framework requiring fluctuations of Langevin type.
We present new stochastic approaches constructed by requiring a thorough description of the mean-field response in presence of instabilities. Their particular relevance is an improved description of the spinodal fragmentation mechanism at the threshold, where the instability growth is frustrated by the mean-field resilience.
© Owned by the authors, published by EDP Sciences - SIF, 2015
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