Deterministic Distributed Dominating Set Approximation in the CONGEST Model
We develop deterministic approximation algorithms for the minimum dominating set problem in the CONGEST model with an almost optimal approximation guarantee. For $ε>1/{\text{poly}}\log Δ$ we obtain two algorithms with approximation factor $(1+ε)(1+\ln (Δ+1))$ and with runtimes $2^{O(\sqrt{\log n \log\log n})}$ and $O(Δ\cdot\text{poly}\log Δ+\text{poly}\log Δ\log^{*} n)$, respectively. Further we show how dominating set approximations can be deterministically transformed into a connected dominating set in the \CONGEST model while only increasing the approximation guarantee by a constant factor. This results in a deterministic $O(\log Δ)$-approximation algorithm for the minimum connected dominating set with time complexity $2^{O(\sqrt{\log n \log\log n})}$.