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Random reflections in a high dimensional tube

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arxiv 1601.07973 v2 pith:QMB7V5HZ submitted 2016-01-29 math.PR math-phmath.DSmath.MP

Random reflections in a high dimensional tube

classification math.PR math-phmath.DSmath.MP
keywords lighttubedimensionaldistributionexitreflectionsanglearticle
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We consider light ray reflections in $n$-dimensional semi-infinite tube, for $n\geq 3$, made of Lambertian material. The source of light is placed far away from the exit, and the light ray is assumed to reflect so that the distribution of the direction of the reflected light ray has the density proportional to the cosine of the angle with the normal vector. We present new results on the exit distribution from the tube, and generalizations of some theorems from an earlier article, where the dimension was limited to $n=2$ and $3$.

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