Concept

Beta function (physics)

Publications associées (93)

Fast and accurate algorithm for the simulation of NMR spectra of large spin systems

Luc Patiny, Julien Wist, Andrés Mauricio Castillo Robles

The computational cost for the simulation of NMR spectra grows exponentially with the number of nuclei. Today, the memory available to store the Hamiltonian limits the size of the system that can be studied. Modern computers enable to tackle systems contai ...

2011

Critical Percolation: the Expected Number of Clusters in a Rectangle

Clément Hongler, Stanislav Smirnov

We show that for critical site percolation on the triangular lattice two new observables have conformally invariant scaling limits. In par- ticular the expected number of clusters separating two pairs of points converges to an explicit conformal invariant. ...

Springer Verlag2011

NLO QCD corrections to five-jet production at LEP and the extraction of alpha(s)(M-Z)

The highest exclusive jet multiplicity studied at LEP experiments is five. In this paper we compute the next-to-leading order QCD corrections to e(+)e(-) annihilation to five jets, essentially closing the (pure) perturbative QCD studies of exclusive jetty ...

2010

Effects of heavy modes on vacuum stability in supersymmetric theories

Claudio Scrucca, Leonardo Brizi

We study the effects induced by heavy fields on the masses of light fields in supersymmetric theories, under the assumption that the heavy mass scale is much higher than the supersymmetry breaking scale. We show that the square-masses of light scalar field ...

2010

Effective Spin Model for the Spin-Liquid Phase of the Hubbard Model on the Triangular Lattice

Frédéric Mila

We show that the spin-liquid phase of the half-filled Hubbard model on the triangular lattice can be described by a pure spin model. This is based on a high-order strong coupling expansion ( up to order 12) using perturbative continuous unitary transformat ...

2010

Theoretical constraints on the Higgs effective couplings

Riccardo Rattazzi, Alessandro Vichi

We derive constraints on the sign of couplings in an effective Higgs Lagrangian using prime principles such as the naturalness principle, global symmetries, and unitarity. Specifically, we study four dimension-six operators, O-H, O-y, O-g, and O-gamma, whi ...

2010

Leptogenesis with TeV Scale Inverse Seesaw in SO(10)

Steve Blanchet

We discuss leptogenesis within a TeV-scale inverse seesaw model for neutrino masses where the seesaw structure is guaranteed by an SO(10) symmetry. Contrary to the TeV-scale type-I gauged seesaw, the constraints imposed by successful leptogenesis in these ...

American Physical Society2010

Gaugino mass in AdS space

Riccardo Rattazzi, Claudio Scrucca

We study supersymmetric QED in AdS(4) with massless matter. At 1-loop the ultra-violet regulator of the theory generates a contribution to the gaugino mass that is naively inconsistent with unbroken supersymmetry. We show that this effect, known in flat sp ...

2009

Magnetization plateaux in an extended Shastry-Sutherland model

Frédéric Mila, Julien Dorier

We study an extended two-dimensional Shastry-Sutherland model in a magnetic field where besides the usual Heisenberg exchanges of the Shastry-Sutherland model two additional SU(2) invariant couplings are included. Perturbative continous unitary transformat ...

2009

De Haas-van Alphen effect and energy gaps of a correlated two-dimensional electron system in an AlAs two-valley pseudospin system

Anna Fontcuberta i Morral, Dirk Grundler

We report highly sensitive de Haas-van Alphen (dHvA) effect measurements on a high-mobility two-dimensional electron system in an AlAs quantum well. Here two valleys are occupied forming a pseudospin system. At 400 mK, the dHvA effect shows pronounced osci ...

2009

Graph Chatbot

Chattez avec Graph Search

Posez n’importe quelle question sur les cours, conférences, exercices, recherches, actualités, etc. de l’EPFL ou essayez les exemples de questions ci-dessous.

AVERTISSEMENT : Le chatbot Graph n'est pas programmé pour fournir des réponses explicites ou catégoriques à vos questions. Il transforme plutôt vos questions en demandes API qui sont distribuées aux différents services informatiques officiellement administrés par l'EPFL. Son but est uniquement de collecter et de recommander des références pertinentes à des contenus que vous pouvez explorer pour vous aider à répondre à vos questions.

Connectez-vous pour utiliser Chat avec Graph Search