Every graph of treewidth k and max degree Δ has a tree-partition of width O(kΔ) whose underlying tree has max degree O(Δ) and O(n/kΔ) vertices; domino treewidth is Θ(kΔ²) and a related spread-k bound is tight.
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Tree-partitions and small-spread tree-decompositions
Every graph of treewidth k and max degree Δ has a tree-partition of width O(kΔ) whose underlying tree has max degree O(Δ) and O(n/kΔ) vertices; domino treewidth is Θ(kΔ²) and a related spread-k bound is tight.