Symmetry, symmetry breaking and topology
type: Item
instance of: scholarly article
title: Symmetry, symmetry breaking and topology
zbMATH Open document ID: 1360.81213
author: Siddhartha Sen
published in: Symmetry
publication date: 2017-05-12T00:00:00Z
review text: Summary: The ground state of a system with symmetry can be described by a group \(G\). This symmetry group \(G\) can be discrete or continuous. Thus for a crystal \(G\) is a finite group while for the vacuum state of a grand unified theory \(G\) is a continuous Lie group. The ground state symmetry described by \(G\) can change spontaneously from \(G\) to one of its subgroups \(H\) as the external parameters of the system are modified. Such a macroscopic change of the ground state symmetry of a system from \(G\) to \(H\) correspond to a ``phase transition''. Such phase transitions have been extensively studied within a framework due to Landau. A vast range of systems can be described using Landau's approach, however there are also systems where the framework does not work. Recently there has been growing interest in looking at such non-Landau type of phase transitions. For instance there are several ``quantum phase transitions'' that are not of the Landau type. In this short review we first describe a refined version of Landau's approach in which topological ideas are used together with group theory. The combined use of group theory and topological arguments allows us to determine selection rule which forbid transitions from \(G\) to certain of its subgroups. We end by making a few brief remarks about non-Landau type of phase transition.
Mathematics Subject Classification ID: 81R40
zbMATH DE Number: 6714410
zbMATH Keywords: symmetry breaking
zbMATH Keywords: group theory
zbMATH Keywords: topology
MaRDI profile type: Publication
full work available at URL: sym2031401
OpenAlex ID: W2010192664
DOI: 10.3390/SYM2031401
description: scientific article; zbMATH DE number 6714410