Political Islam in Algeria. CEPS Working Document No. 268, May 2007

The recent legislative elections of May 2007 in Algeria have shown how complex the evolution of Islamist parties is in this country and how crucial an understanding of these mechanisms has become for Europe. Since the civil war of the 1990s, Islamist parties have experienced increased political participation. Drawing on interviews with various Algerian Islamist actors, this paper analyses how Islamist parties are building a new relationship with democratic mechanisms in Europe. In light of these recent changes, a reconsideration of EU democracy promotion policies is now necessary

Right-handed neutrinos as the source of density perturbations

We study the possibility that cosmological density perturbations are generated by the inhomogeneous decay of right-handed neutrinos. This will occur if a scalar field whose fluctuations are created during inflation is coupled to the neutrino sector. Robust predictions of the model are a detectable level of non-Gaussianity and, if standard leptogenesis is the source of the baryon asymmetry, a baryon isocurvature perturbations at the level of the present experimental constraints.Comment: 14 pages, 2 figure

Low-scale leptogenesis and soft supersymmetry breaking

We investigate the possibility of low-scale leptogenesis in the minimal supersymmetric standard model extended with right handed (s)neutrinos. We demonstrate that successful leptogenesis can be easily achieved at a scale as low as ~ TeV where lepton number and CP violation comes from soft supersymmetry breaking terms. The scenario is shown to be compatible with neutrino masses data.Comment: 4 pages, revtex, uses axodraw. Minor changes to match acccepted version in PR

Phenomenological approaches of inflation and their equivalence

In this work, we analyze two possible alternative and model-independent approaches to describe the inflationary period. The first one assumes a general equation of state during inflation due to Mukhanov, while the second one is based on the slow-roll hierarchy suggested by Hoffman and Turner. We find that, remarkably, the two approaches are equivalent from the observational viewpoint, as they single out the same areas in the parameter space, and agree with the inflationary attractors where successful inflation occurs. Rephrased in terms of the familiar picture of a slowly rolling, canonically normalized scalar field, the resulting inflaton excursions in these two approaches are almost identical. Furthermore, once the Galactic dust polarization data from Planck are included in the numerical fits, inflaton excursions can safely take sub-Planckian values.Comment: Revtex, 8 pages, 4 figures. References updated. Matches published version in PR

ENMSJ : An Efficiency Filtering Technique using Bitmap Vectors for n-way Joins in Wireless Sensor Networks

In wireless sensor networks, join queries execution introduces a high energy consumption. While energy is an important factor for sensors survival, several techniques were developed to reduce it.  Sensors energy is affected by the number of transferred messages whereas query is performed. The aim of the proposed techniques was then to decrease the communicated data volume.  So, the exchanged data volume is soaring when joins are performed between many data tables. This joins type is called: n-way join query.  In this paper, we present an efficiency technique to treat n-way join queries in wireless sensor networks. This technique is named: Enhanced N-way Mediated Semi-Join (ENMSJ). ENMSJ is an improvement of a precedent strategie that we proposed: N-way Mediated Semi-Join (NMSJ). ENMSJ uses bitmap tables to more reduce transferred messages quantity.  We compared the two techniques to test their performance. Obtained results are very hopeful.