Phase transitions in the $q$-coloring of random hypergraphs - Archive ouverte HAL Access content directly
Journal Articles Journal of Physics A: Mathematical and Theoretical Year : 2017

## Phase transitions in the $q$-coloring of random hypergraphs

Marylou Gabrié
• Function : Correspondent author
Varsha Dani
• Function : Author
Lenka Zdeborová
• Function : Author

#### Abstract

We study in this paper the structure of solutions in the random hypergraph coloring problem and the phase transitions they undergo when the density of constraints is varied. Hypergraph coloring is a constraint satisfaction problem where each constraint includes $K$ variables that must be assigned one out of q colors in such a way that there are no monochromatic constraints, i.e. there are at least two distinct colors in the set of variables belonging to every constraint. This problem generalizes naturally coloring of random graphs ($K$ = 2) and bicoloring of random hypergraphs ($q$ = 2), both of which were extensively studied in past works. The study of random hypergraph coloring gives us access to a case where both the size q of the domain of the variables and the arity $K$ of the constraints can be varied at will. Our work provides explicit values and predictions for a number of phase transitions that were discovered in other constraint satisfaction problems but never evaluated before in hypergraph coloring. Among other cases we revisit the hypergraph bicoloring problem ($q$ = 2) where we find that for $K$= 3 and $K$ = 4 the colorability threshold is not given by the one-step-replica-symmetry-breaking analysis as the latter is unstable towards more levels of replica symmetry breaking. We also unveil and discuss the coexistence of two different 1RSB solutions in the case of $q$ = 2, $K$ ≥ 4. Finally we present asymptotic expansions for the density of constraints at which various phase transitions occur, in the limit where $q$ and/or $K$ diverge.

### Dates and versions

cea-01614263 , version 1 (10-10-2017)

### Identifiers

• HAL Id : cea-01614263 , version 1
• ARXIV :
• DOI :

### Cite

Marylou Gabrié, Varsha Dani, Guilhem Semerjian, Lenka Zdeborová. Phase transitions in the $q$-coloring of random hypergraphs. Journal of Physics A: Mathematical and Theoretical, 2017, 50, pp.505002. ⟨10.1088/1751-8121/aa9529⟩. ⟨cea-01614263⟩

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