title: Zero-temperature properties of RNA secondary structures.
abstract: We analyze different microscopic RNA models at zero temperature. We discuss both the most simple model, which suffers a large degeneracy of the ground state, and models in which the degeneracy has been removed in a more or less severe manner. We calculate low-energy density of states using a coupling perturbing method, where the ground state of a modified Hamiltonian, that repels the original ground state, is determined. We evaluate scaling exponents starting from measurements of overlaps and energy differences. In the case of models without accidental degeneracy of the ground state we are able to clearly establish the existence of a glassy phase with theta approximately 1/3. 87.15.Aa, 64.60.Fr
authors: Dipartimento di Fisica, SMC and UdR1 of INFM, INFN, Università di Roma "La Sapienza," Piazzale Aldo Moro 2, I-00185 Rome, Italy. Enzo.Marinari@roma1.infn.it
authors: Enzo
authors: E
authors: Marinari
authors: Andrea
authors: A
authors: Pagnani
authors: Federico
authors: F
authors: Ricci-Tersenghi
mesh_terms: D005615:Freezing; D008956:Models, Chemical; D009690:Nucleic Acid Conformation; D012313:RNA / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D012313:RNA