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.¹; Koolen, Jack H.²; Nozaki, Hiroshi ³

¹ University of Delaware Department of Mathematical Sciences Ewing Hall Newark, DE 19716-2553, USA
² School of Mathematical Sciences University of Science and Technology of China Wen-Tsun Wu Key Laboratory of the Chinese Academy of Sciences Hefei, Anhui, China
³ Aichi University of Education 1 Hirosawa, Igaya-cho, Kariya Aichi 448-8542, Japan

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: 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.
Author's affiliations:

Cioabă, Sebastian M. ¹; Koolen, Jack H. ²; Nozaki, Hiroshi ³

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     title = {A spectral version of the {Moore} problem for bipartite regular graphs},
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     pages = {1219--1238},
     publisher = {MathOA foundation},
     volume = {2},
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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/articles/10.5802/alco.71/

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