Mathematics – Probability

Scientific paper

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2009-08-19

Mathematics

Probability

Scientific paper

We prove that the mixing time of the Glauber dynamics for random $k$-colorings of the complete tree with branching factor $b$ undergoes a phase transition at $k=b(1+o_b(1))/\ln{b}$. Our main result shows nearly sharp bounds on the mixing time of the dynamics on the complete tree with $n$ vertices for $k=Cb/\ln{b}$ colors with constant $C$. For $C\geq 1$ we prove the mixing time is $O(n^{1+o_b(1)}\ln^2{n})$. On the other side, for $C< 1$ the mixing time experiences a slowing down, in particular, we prove it is $O(n^{1/C + o_b(1)}\ln^2{n})$ and $\Omega(n^{1/C-o_b(1)})$. The critical point C=1 is interesting since it coincides (at least up to first order) to the so-called reconstruction threshold which was recently established by Sly. The reconstruction threshold has been of considerable interest recently since it appears to have close connections to the efficiency of certain local algorithms, and this work was inspired by our attempt to understand these connections in this particular setting.

**Tetali Prasad**

Mathematics – Probability

Scientist

**Vera Juan C.**

Mathematics – Probability

Scientist

**Vigoda Eric**

Biology – Quantitative Biology – Populations and Evolution

Scientist

**Yang Linji**

Mathematics – Probability

Scientist

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