Determining the Complexity of Chromatic Sum in Classes Defined by a Set of Forbidden Graphs

The Chromatic Sum problem asks, given a graph $G$ and an integer $k$, whether $G$ admits a colouring $c$ with sum $\sum_{v\in V}c(v) \leq k$.

We study the complexity of Chromatic Sum on graph classes defined by some set of forbidden graphs.

First, we show that three known frameworks fully classify the complexity of Chromatic Sum on $HH$-minor-free graphs and $HH$-topological-minor-free graphs for any set of graphs $HH$, and on $HH$-subgraph-free graphs for any finite set of graphs $HH$.

To show this, we prove a new NP-completeness result for Chromatic Sum on certain subdivisions of planar subcubic graphs.

Next, we consider other containment relations.

We formalise a novel framework of problems that are NP-complete for planar graphs as well as for graphs of bounded independence number.

For every problem in this framework, we obtain an almost complete complexity classification on $H$-induced-minor-free graphs, $H$-induced-topological-minor-free graphs, and $H$-free graphs for every graph $H$.

We show that Chromatic Sum belongs to this framework, as do several other problems.

We also define a more fine-grained framework for the induced subgraph relation.

We apply this to obtain a complete complexity classification for Chromatic Sum on $H$-free graphs, as well as for several other problems.

We justify the choice of this framework by proving that Chromatic Sum is NP-complete for graphs of clique-width at most $3$.

This result complements a known polynomial-time result for graphs of clique-width at most $2$.