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The chromatic number of dense random graphs
Abstract:The chromatic number urn:x-wiley:10429832:media:rsa20757:rsa20757-math-0001 of a graph G is defined as the minimum number of colors required for a vertex coloring where no two adjacent vertices are colored the same. The chromatic number of the dense random graph urn:x-wiley:10429832:media:rsa20757:rsa20757-math-0002 where urn:x-wiley:10429832:media:rsa20757:rsa20757-math-0003 is constant has been intensively studied since the 1970s, and a landmark result by Bollobás in 1987 first established the asymptotic value of urn:x-wiley:10429832:media:rsa20757:rsa20757-math-0004. Despite several improvements of this result, the exact value of urn:x-wiley:10429832:media:rsa20757:rsa20757-math-0005 remains open. In this paper, new upper and lower bounds for urn:x-wiley:10429832:media:rsa20757:rsa20757-math-0006 are established. These bounds are the first ones that match each other up to a term of size o(1) in the denominator: they narrow down the coloring rate urn:x-wiley:10429832:media:rsa20757:rsa20757-math-0007 of urn:x-wiley:10429832:media:rsa20757:rsa20757-math-0008 to an explicit interval of length o(1), answering a question of Kang and McDiarmid.
Keywords:chromatic number  graph coloring  random graphs  second moment method
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