Towards a conjecture on long induced rainbow paths in triangle-free graphs

Given a triangle-free graph $G$ with chromatic number $k$ and a proper vertex coloring $ϕ$ of $G$, it is conjectured that $G$ contains an induced rainbow path on $k$ vertices under $ϕ$. Scott and Seymour proved the existence of an induced rainbow path on $(\log \log \log k)^{\frac{1}{3}- o(1)}$ vertices. We improve this to $(\log k)^{\frac{1}{2}- o(1)}$ vertices. Further, we prove the existence of an induced path that sees $\frac{k}{2}$ colors.

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