Explicit near-Ramanujan graphs of every degree

Explicit near-Ramanujan graphs of every degree
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DOI:
10.1145/3357713.3384231
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发表时间:
2019-09
期刊:
Proceedings of the 52nd Annual ACM SIGACT Symposium on Theory of Computing
影响因子:
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通讯作者:
Sidhanth Mohanty;R. O'Donnell;Pedro Paredes
Sidhanth Mohanty;R. O'Donnell;Pedro Paredes
中科院分区:
其他
文献类型:
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作者:
Sidhanth Mohanty;R. O'Donnell;Pedro Paredes

文献摘要

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对于每个常数d≥3和n > 0,我们给出了一个确定性的多(n)时间算法,该算法输出Θ(n)个顶点上的d正则图є-near-Ramanujan;也就是说,它的特征值在大小上以2√d−1 + k为界(不包括d的单个平凡特征值)。
For every constant d ≥ 3 and є > 0, we give a deterministic poly(n)-time algorithm that outputs a d-regular graph on Θ(n) vertices that is є-near-Ramanujan; i.e., its eigenvalues are bounded in magnitude by 2√d−1 + є (excluding the single trivial eigenvalue of d).