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Concept

Modèle sigma non linéaire

Publications associées (24)

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

Mikhail Chapochnikov, 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