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24 papers · 1 filter
Screening Current Representation of Quantum Superalgebras
J. Rasmussen
In this letter a screening current or contour representation is given of certain quantum superalgebras. The Gomez-Sierra construction of quantum groups in conformal field theory is…
CDM models with a BSI steplike primordial spectrum and a cosmological constant
J. Lesgourgues, D. Polarski, A. A. Starobinsky
A class of spatially-flat models with cold dark matter (CDM), a cosmological constant and a broken-scale-invariant (BSI) steplike primordial (initial) spectrum of adiabatic perturb…
CMB anisotropy predictions for a model of double inflation
Julien Lesgourgues, David Polarski
We consider a double-inflationary model with two massive scalar fields interacting only gravitationally in the context of a flat cold dark matter (CDM) Universe. The cosmic microwa…
Improving a method for the study of limit cycles of the Lienard equation
Hector Giacomini, Sebastien Neukirch
In recent papers we have introduced a method for the study of limit cycles of the Lienard system: dot{x}=y-F(x), dot{y}=-x, where F(x) is an odd polynomial. The method gives a sequ…
Non-Abelian Duality Based on Non-Semi-Simple Isometry Groups
Noureddine Mohammedi
Non-Abelian duality transformations built on non-semi-simple isometry groups are analysed. We first give the conditions under which the original non-linear sigma model and its non-…
Dynamics of a global string with large Higgs boson mass
C. Charmousis, B. Boisseau, B. Linet
We consider a self-gravitating string generated by a global vortex solution in general relativity. We investigate the Einstein and field equations of a global vortex in the region…