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Energy diffusion in hard-point systems (Articolo in rivista)

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Delfini, L; Denisov, S; Lepri, S; Livi, R; Mohanty, PK; Politi, A (2007)
Energy diffusion in hard-point systems
in The European physical journal. Special topics
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CNR, Ist Sistemi Complessi, I-50019 Sesto Fiorentino, Italy; Univ Augsburg, Dept Phys, D-86135 Augsburg, Germany; Dipartimento Fis, I-50019 Sesto Fiorentino, Italy; Saha Inst Nucl Phys, Calcutta, India; Ist Nazl Fis Nucl, I-50125 Florence, Italy; Ist Nazl Fis Mat, Florence, Italy (literal)

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We investigate the diffusive properties of energy fluctuations in a one- dimensional diatomic chain of hard- point particles interacting through a square- well potential. The evolution of initially localized infinitesimal and finite perturbations is numerically investigated for different density values. All cases belong to the same universality class which can be also interpreted as a Levy walk of the energy with scaling exponent gamma= 3/5. The zero- pressure limit is nevertheless exceptional in that normal diffusion is found in tangent space and yet anomalous diffusion with a different rate for perturbations of finite amplitude. The different behaviour of the two classes of perturbations is traced back to the ' stable chaos' type of dynamics exhibited by this model. Finally, the effect of an additional internal degree of freedom is investigated, finding that it does not modify the overall scenario. (literal)

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