Tricritical point

About: Tricritical point is a research topic. Over the lifetime, 2536 publications have been published within this topic receiving 47570 citations.

Signatures of the Tricritical Point in QCD

Abstract: Several approaches to QCD with two {ital massless} quarks at finite temperature T and baryon chemical potential {mu} suggest the existence of a tricritical point on the boundary of the phase with spontaneously broken chiral symmetry. In QCD with {ital massive} quarks there is then a critical point at the end of a first order transition line. We discuss possible experimental signatures of this point, which provide information about its location and properties. We propose a combination of event-by-event observables, including suppressed fluctuations in T and {mu} and, simultaneously, enhanced fluctuations in the multiplicity of soft pions. {copyright} {ital 1998} {ital The American Physical Society }

Phase Diagram of QCD

Abstract: We analyze the phase diagram of QCD with two massless quark flavors in the space of temperature $T$ and chemical potential of the baryon charge \ensuremath{\mu} using available experimental knowledge of QCD, insights gained from various models, as well as general and model independent arguments including continuity, universality, and thermodynamic relations. A random matrix model is used to describe the chiral symmetry restoration phase transition at finite $T$ and \ensuremath{\mu}. In agreement with general arguments, this model predicts a tricritical point in the $T\ensuremath{\mu}$ plane. Certain critical properties at such a point are universal and can be relevant to heavy ion collision experiments.

Collapse of a polymer chain in poor solvents

Abstract: The behavior of a single, flexible polymer chain near the Flory temperature Θ is analysed in analogy with a magnetic phase transition. The transition to a collapsed state is related to a tricritical point for the magnetic problem.

Critical-point and coexistence-curve properties of the Lennard-Jones fluid: A finite-size scaling study.

Abstract: Monte Carlo simulations within the grand canonical ensemble are used to explore the liquid-vapor coexistence-curve and critical-point properties of the Lennard-Jones fluid. Attention is focused on the joint distribution of density and energy fluctuations at coexistence. In the vicinity of the critical point, this distribution is analyzed using mixed-field finite-size scaling techniques aided by histogram reweighting methods. The analysis yields highly accurate estimates of the critical-point parameters as well as exposing the size and character of corrections to scaling. In the subcritical coexistence region the density distribution is obtained by combining multicanonical simulations with histogram reweighting techniques. It is demonstrated that this procedure permits an efficient and accurate mapping of the coexistence curve, even deep within the two-phase region.