A spectral version of the Moore problem for bipartite regular graphs

Cioabă, Sebastian M.; Koolen, Jack H.; Nozaki, Hiroshi

doi:10.5802/alco.71

Cioabă, Sebastian M.; Koolen, Jack H.; Nozaki, Hiroshi

Algebraic Combinatorics, Volume 2 (2019) no. 6, pp. 1219-1238.

Abstract

Let $b (k, θ)$ be the maximum order of a connected bipartite $k$ -regular graph whose second largest eigenvalue is at most $θ$ . In this paper, we obtain a general upper bound for $b (k, θ)$ for any $0 \leq θ < 2 \sqrt{k - 1}$ . Our bound gives the exact value of $b (k, θ)$ whenever there exists a bipartite distance-regular graph of degree $k$ , second largest eigenvalue $θ$ , diameter $d$ and girth $g$ such that $g \geq 2 d - 2$ . For certain values of $d$ , there are infinitely many such graphs of various valencies $k$ . However, for $d = 11$ or $d \geq 15$ , we prove that there are no bipartite distance-regular graphs with $g \geq 2 d - 2$ .

Received: 2018-05-02
Revised: 2019-03-04
Accepted: 2019-03-04
Published online: 2019-12-04

MR 4049844 | Zbl 1428.05187

DOI: https://doi.org/10.5802/alco.71
Classification: 05B25, 05C35, 05C50, 05E30, 42C05, 94B65
Keywords: second eigenvalue, bipartite regular graph, bipartite distance-regular graph, expander, linear programming bound.

@article{ALCO_2019__2_6_1219_0,
     author = {Cioab\u a, Sebastian M. and Koolen, Jack H. and Nozaki, Hiroshi},
     title = {A spectral version of the Moore problem for bipartite regular graphs},
     journal = {Algebraic Combinatorics},
     pages = {1219--1238},
     publisher = {MathOA foundation},
     volume = {2},
     number = {6},
     year = {2019},
     doi = {10.5802/alco.71},
     mrnumber = {4049844},
     zbl = {1428.05187},
     language = {en},
     url = {https://alco.centre-mersenne.org/item/ALCO_2019__2_6_1219_0/}
}

Cioabă, Sebastian M.; Koolen, Jack H.; Nozaki, Hiroshi. A spectral version of the Moore problem for bipartite regular graphs. Algebraic Combinatorics, Volume 2 (2019) no. 6, pp. 1219-1238. doi : 10.5802/alco.71. https://alco.centre-mersenne.org/item/ALCO_2019__2_6_1219_0/

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