Concept

Non-linear sigma model

Related publications (38)

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Effective spin-flip scattering in diffusive superconducting proximity systems with magnetic disorder

Dmitri Ivanov

We revisit the problem of diffusive proximity systems involving superconductors and normal metals (or ferromagnets) with magnetic disorder. On the length scales much larger than its correlation length, the effect of sufficiently weak magnetic disorder may ...

2009

Quantum scale invariance on the lattice

Igor Tkachev

We propose a scheme leading to a non-perturbative definition of lattice field theories which are scale-invariant on the quantum level. A key idea of the construction is the replacement of the lattice spacing by a propagating dynamical field - the dilaton. ...

2009

Dyson-Maleev representation of nonlinear sigma models

Dmitri Ivanov

For nonlinear sigma models in the unitary symmetry class, the nonlinear target space can be parameterized with cubic polynomials. This choice of coordinates has been known previously as the Dyson-Maleev parameterization for spin systems, and we show that i ...

2008

Anomaly holography, the Wess-Zumino-Witten term, and electroweak symmetry breaking

I consider anomalies in effective field theories (EFTs) of gauge fields coupled to fermions on an interval in AdS(5), and their holographic duals. The anomalies give rise to constraints on the consistent EFT description, which are stronger than the usual f ...

2008

Noncollinear magnetism in liquid oxygen: A first-principles molecular dynamics study

Alfredo Pasquarello

We perform first-principles molecular dynamics of liquid oxygen in which the magnetic structure evolves according to a generalized density-functional scheme allowing for noncollinear spin configurations. We investigate both structural correlations between ...

2004

Sigma-model symmetry in orientifold models

Claudio Scrucca

We investigate in the simplest compact D = 4 N = 1 type-II B orientifold models the sigma-model symmetry suggested by the proposed duality of these models to heterotic orbifold vacua. This symmetry is known to be present at the classical level, and is asso ...

2000

Extracting supersymmetry-breaking effects from wave-function renormalization

Riccardo Rattazzi

We show that in theories in which supersymmetry breaking is communicated by renormalizable perturbative interactions, it is possible to extract the soft terms for the observable fields from wave-function renormalization. Therefore all the information about ...

1998

Effects of spatiotemporal variations on metabolic control: approximate analysis using (log)linear kinetic models

Vassily Hatzimanikatis

For many metabolic systems, available exptl. data allow description of the system by elasticities and control coeffs. The availability of information of this kind motivated the development of a (log)linear kinetic model of metabolic systems that is complet ...

1997