The monochromatic cycle interval conjecture for dense 2-colored graphs

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Let GG be a graph of order nn, with vertex set V(G)V(G) and edge set E(G)E(G). A 22-coloring of GG is a partition

E(G)=E(R)∪E(B),E(G)=E(R)\cup E(B),

where RR and BB are spanning subgraphs of GG. Write Ck⊂RC_k\subset R or Ck⊂BC_k\subset B when the red or blue graph contains a cycle of length kk.

Monochromatic cycle interval conjecture. If n≥4n\geq4 and δ(G)>3n/4\delta(G)>3n/4, then every 22-coloring of E(G)E(G) has, for every k∈[4,⌈n/2⌉]k\in[4,\lceil n/2\rceil], either a red kk-cycle or a blue kk-cycle:

Ck⊂R or Ck⊂Bfor all k∈[4,⌈n/2⌉].C_k\subset R\text{ or }C_k\subset B\quad\text{for all }k\in[4,\lceil n/2\rceil].

This proposes a Ramsey--Turán strengthening of results for complete graphs and very dense graphs: a minimum-degree condition should force monochromatic cycles of every length in a whole interval, rather than merely one cycle length. The source gives no resolution status for the conjecture.

References

Primary source

Hao Li, Vladimir Nikiforov and Richard Schelp, “A new type of Ramsey-Turan problems”, arXiv:1001.2078 (2010).

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