Phase structure of lattice SU(2)⊗US(1) three-dimensional gauge theory

Farakos, K; Mavromatos, NE; McNeill, D

dc.contributor.author	Farakos, K	en
dc.contributor.author	Mavromatos, NE	en
dc.contributor.author	McNeill, D	en
dc.date.accessioned	2014-03-01T01:15:03Z
dc.date.available	2014-03-01T01:15:03Z
dc.date.issued	1999	en
dc.identifier.issn	05562821	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13307
dc.subject	Gauge Theory	en
dc.subject	High Temperature Superconducting	en
dc.subject	Lattice Gauge Theory	en
dc.subject	Phase Diagram	en
dc.subject	Strong Coupling	en
dc.subject	Symmetry Breaking	en
dc.subject	Three Dimensional	en
dc.subject	kosterlitz thouless	en
dc.subject	non perturbative	en
dc.title	Phase structure of lattice SU(2)⊗US(1) three-dimensional gauge theory	en
heal.type	journalArticle	en
heal.identifier.primary	10.1103/PhysRevD.59.034502	en
heal.identifier.secondary	http://dx.doi.org/10.1103/PhysRevD.59.034502	en
heal.publicationDate	1999	en
heal.abstract	We discuss a phase diagram for a relativistic SU(2)XUS(1) lattice gauge theory, with emphasis on the formation of a parity-invariant chiral condensate, in the case when the US(1) field is infinitely coupled, and the SU(2) field is moved away from infinite coupling by means of a strong-coupling expansion. We provide analytical arguments on the existence of (and partially derive) a critical line in coupling space, separating the phase of broken SU(2) symmetry from that where the symmetry is unbroken. We review unconventional (Kosterlitz-Thouless type) superconducting properties of the model, upon coupling it to external electromagnetic potentials. We discuss the role of instantons of the unbroken subgroup U(1) ∈ SU(2), in eventually destroying superconductivity under certain circumstances. The model may have applications to the theory of high-temperature superconductivity. In particular, we argue that in the regime of the couplings leading to the broken SU(2) phase, the model may provide an explanation on the appearance of a pseudogap phase, lying between the antiferromagnetic and the superconducting phases. In such a phase, a fermion mass gap appears in the theory, but there is no phase coherence, due to the Kosterlitz-Thouless mode of symmetry breaking. The absence of superconductivity in this phase is attributed to nonperturbative effects (instantons) of the gauge field U(1) ∈ SU(2). ©1999 The American Physical Society.	en
heal.journalName	Physical Review D - Particles, Fields, Gravitation and Cosmology	en
dc.identifier.doi	10.1103/PhysRevD.59.034502	en
dc.identifier.volume	59	en
dc.identifier.issue	3	en
dc.identifier.spage	1	en
dc.identifier.epage	26	en