ENTROPY WAVES, THE ZIG-ZAG GRAPH PRODUCT, AND NEW CONSTANT-DEGREE
By Omer Reingold, Salil P. Vadhan, Avi Wigderson. 2004
128 citations recorded by the source corpus.
The main contribution of this work is a new type of graph product, which we call the {\it zig-zag product}. Taking a product of a large graph with a small graph, the resulting graph inherits (roughly) its size from the large one, its degree from the small one, and its expansion properties from both! Iteration yields simple explicit constructions of constant-degree expanders of arbitrary size, starting from one constant-size expander. Crucial to our intuition (and simple analysis) of the properties of this graph product is the view of expanders as functions which act as ``entropy wave" propagators -- they transform probability distributions in which entropy is concentrated in one area to distributions where that concentration is dissipated. In these terms, the graph products affords the constructive interference of two such waves. Subsequent work [ALW01], [MW01] relates the zig-zag product of graphs to the standard semidirect product of groups, leading to new results and constructions on expanding Cayley graphs.
Subfields: Cognitive Neuroscience, Statistical and Nonlinear Physics
View Paper: https://www.semanticscholar.org/paper/f7c112a80dc91aeb2c2fffb96d46be230a553a38
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In Statistical and Nonlinear Physics
Citations in the corpus
- Percolation on finite graphs and isoperimetric inequalities (2002, background): “The statement of this theorem holds for any family of expanders, such as the ones described in [4, 20, 24 ] and their references.”
- Some notes on Property A (2006, background): “[ RVW02 ] introduces the zig-zag graph product and uses it to construct expanders.”