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arXiv · 1602.02291

Discrepancy and Eigenvalues of Cayley Graphs

Yoshiharu Kohayakawa·Vojtěch Rödl·Mathias Schacht
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Abstract

We consider quasirandom properties for Cayley graphs of finite abelian groups. We show that having uniform edge-distribution (i.e., small discrepancy) and having large eigenvalue gap are equivalent properties for such Cayley graphs, even if they are sparse. This positively answers a question of Chung and Graham ["Sparse quasi-random graphs", Combinatorica 22 (2002), no. 2, 217-244] for the particular case of Cayley graphs of abelian groups, while in general the answer is negative.

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Yoshiharu Kohayakawa, Vojtěch Rödl, Mathias Schacht. 2016-07-18. Discrepancy and Eigenvalues of Cayley Graphs. https://doi.org/10.1007/s10587-016-0302-x

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