Tag: spectral dimension

Probabilistic Interpretation of the Einstein Relation

Post author By R Hilfer
Post date June 8, 1987

R. Hilfer, A. Blumen

Physical Review A 37, 578 (1988)
10.1103/PhysRevA.37.578

submitted on
Monday, June 8, 1987

We present a probabilistic picture for the Einstein relation which holds for arbitrarily connected structures. The diffusivity is related to mean first-passage times, while the conductance is given as a direct-passage probability. The fractal Einstein relation is an immediate consequence of our result. In addition, we derive a star-triangle transformation for Markov chains and calculate the exact values of the fracton (spectral) dimension for treelike structures. We point to the relevance of the probabilistic interpretation for simulation and experiment.

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Tags conductivity, Einstein relation, Markov chain, spectral dimension

Disordered Systems Fractals Lattice Models Renormalisation Stochastic Processes

Renormalisation on Sierpinski-type Fractals

Post author By R Hilfer
Post date April 13, 1984

R. Hilfer, A. Blumen

Journal of Physics A: Mathematical and General 17, L573-L545 (1984)
10.1088/0305-4470/17/10/004

submitted on
Friday, April 13, 1984

We present a family of deterministic fractals which generalise the d-dimensional Sierpinski gaskets and we establish their order of ramification and their fractal and spectral dimensions. Random walks on these fractals are renormalisable and lead to rational, not necessarily polynomial, mappings.

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Tags Anomalous Diffusion, finitely ramified, Markov chain, post-critically finite, real space renormalization, Sierpinski gasket, spectral dimension