English

On Koml\'os' tiling theorem in random graphs

Combinatorics 2016-11-30 v1

Abstract

Conlon, Gowers, Samotij, and Schacht showed that for a given graph HH and a constant γ>0\gamma > 0, there exists C>0C > 0 such that if pCn1/m2(H)p \ge Cn^{-1/m_2(H)} then asymptotically almost surely every spanning subgraph GG of the random graph G(n,p)\mathcal{G}(n,p) with minimum degree at least δ(G)(11/χcr(H)+γ)np\delta(G) \ge (1 - 1/\chi_{\mathrm{cr}}(H) + \gamma )np contains an HH-packing that covers all but at most γn\gamma n vertices. Here, χcr(H)\chi_{\mathrm{cr}}(H) denotes the critical chromatic threshold, a parameter introduced by Koml\'os. We show that this theorem can be bootstraped to obtain an HH-packing covering all but at most γ(C/p)m2(H)\gamma (C/p)^{m_2(H)} vertices, which is strictly smaller when p>Cn1/m2(H)p > C n^{-1/m_2(H)}. In the case where H=K3H = K_3 this answers the question of Balogh, Lee, and Samotij. Furthermore, we give an upper bound on the size of an HH-packing for certain ranges of pp.

Keywords

Cite

@article{arxiv.1611.09466,
  title  = {On Koml\'os' tiling theorem in random graphs},
  author = {Rajko Nenadov and Nemanja Škorić},
  journal= {arXiv preprint arXiv:1611.09466},
  year   = {2016}
}
R2 v1 2026-06-22T17:07:28.373Z