Constructs infinite families of (p^3+1, p+1)-regular Ramanujan Cayley bigraphs from PU_3(Q_p) lattices, analyzes RC cases, proves cutoff for non-backtracking walks, and gives applications to approximation and complexes.
S Brown,Presentations for groups acting on simply-connected complexes, Journal of Pure and Applied Algebra32 (1984), no
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Ramanujan Bigraphs
Constructs infinite families of (p^3+1, p+1)-regular Ramanujan Cayley bigraphs from PU_3(Q_p) lattices, analyzes RC cases, proves cutoff for non-backtracking walks, and gives applications to approximation and complexes.