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arxiv 1108.4701 v1 pith:PMFFEDZB submitted 2011-08-09 physics.data-an cond-mat.stat-mech

Spectral properties of correlation functions of fields with arbitrary position dependence in restricted geometries from the ballistic to the diffusive regimes

classification physics.data-an cond-mat.stat-mech
keywords fieldsballisticdiffusivemotionarbitrarycorrelationdependencefunctions
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The transition between ballistic and diffusive motion poses difficult problems in several fields of physics. In this work we show how to calculate the spectra of the correlation functions between fields of arbitrary spatial dependence as seen by particles moving through the fields in regions bounded by specularly reflecting walls valid for diffusive and ballistic motion as well as the transition region in between for motion in 2 and 3 dimensions. Applications to relaxation in nmr are discussed.

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