paper

The 3-SAT problem with large number of clauses in -replica symmetry breaking scheme

arXiv:cond-mat/0108433 · doi:10.1088/0305-4470/35/3/303

Abstract

In this paper we analyze the structure of the UNSAT-phase of the overconstrained 3-SAT model by studying the low temperature phase of the associated disordered spin model. We derive the Replica Symmetry Broken equations for a general class of disordered spin models which includes the Sherrington - Kirkpatrick model, the Ising -spin model as well as the overconstrained 3-SAT model as particular cases. We have numerically solved the Replica Symmetry Broken equations using a pseudo-spectral code down to and including zero temperature. We find that the UNSAT-phase of the overconstrained 3-SAT model is of the -RSB kind: in order to get a stable solution the replica symmetry has to be broken in a continuous way, similarly to the SK model in external magnetic field.

19 pages, 7 figures; some section improved; iopart style

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