On phase diagram and the pseudogap state in a linear chiral homopolymer model

Abstract

The phase structure of a homopolymer chain is investigated in terms of a universal theoretical model, designed to describe the infrared limit of slow spatial variations. The effects of chirality are studied and compared with the influence of a short-range attractive interaction between monomers, at various ambient temperature values. In the high temperature limit the homopolymer chain is in the self-avoiding random walk phase. But at low temperatures, two different phases are possible: When short-range attractive interactions dominate over chirality, the chain collapses into a space- filling conformation. But when the attractive interactions become weaker, there is a low temperature unfolding transition and the chain becomes like a straight rod. Between the high temperature and low temperature limits, several intermediate states are observed. For sufficiently high values of short-range attraction, the conventional θ-regime is observed between the self-avoiding random walk phase and the space filling collapsed phase. But when chirality increases, there is a trasition from the θ-regime to a pseudogap state. Moreover, a regime akin the θ-regime is identified between the pseudogap state, and the low temperature phase where the chain is like a straight rod. Applications to polymers and proteins, in particular collagen, are suggested.

Journal version of the paper, published in Phys. Rev. E

References in corpus (6)

• Non-Abelian Supercurrents and de Sitter Ground State in Electroweak Theory
• On Energy Functions for String-Like Continuous Curves, Discrete Chains, and Space-Filling One Dimensional Structures
• Peierls-Nabarro Barrier and Protein Loop Propagation
• On spinors, strings, integrable models and decomposed Yang-Mills theory
• Gauge field, strings, solitons, anomalies and the speed of life
• An Abelian two-Higgs model of strongly correlated electrons: phase structure, strengthening of phase transition and QCD at finite density

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