Fuzzy spheres from inequivalent coherent states quantizations

We present a new procedure which allows a coherent state (CS) quantization of any set with a measure. It is manifest through the replacement of classical observables by CS quantum observables, which acts on a Hilbert space of prescribed dimension $N$. The algebra of CS quantum observables has the finite dimension $N^2$. The application to the 2-sphere provides a family of inequivalent CS quantizations, based on the spin spherical harmonics (the CS quantization from usual spherical harmonics appears to give a trivial issue for the cartesian coordinates). We compare these CS quantizations to the usual (Madore) construction of the fuzzy sphere. The difference allows us to consider our procedures as the constructions of new type of fuzzy spheres. The very general character of our method suggests applications to construct fuzzy versions of a variety of sets.Comment: 20 page

Particularités épidémiologiques de l'infection rétrovirale à HTLV-1 en Afrique centrale

L'Afrique subsaharienne est le réservoir le plus important de virus HTLV-1, mais son épidémiologie reste très mal connue. Pour y remédier, les auteurs ont étudié - de 1987 à 1990 - la situation qui prévaut dans six états d'Afrique centrale. Les modalités admises de la transmission sont effectives : voie sanguine par le biais de la transfusion au rôle à moduler selon les régions en fonction de l'importance, souvent faible, de cette pratique; voie hétérosexuelle qui ne paraît pas avoir la place essentielle supposée dans les autres régions d'endémicité du globe et transmission de la mère à l'enfant par l'allaitement au sein. Mais il semble que des facteurs environnementaux - qui restent à préciser - puissent jouer un rôle non négligeable parmi lesquels vecteurs ailés et helminthes pourraient être pris en considération. (Résumé d'auteur

Later cART Initiation in Migrant Men from Sub-Saharan Africa without Advanced HIV Disease in France

International audienceObjectiveTo compare the time from entry into care for HIV infection until combination antiretroviral therapy (cART) initiation between migrants and non migrants in France, excluding late access to care.MethodsAntiretroviral-naïve HIV-1-infected individuals newly enrolled in the FHDH cohort between 2002–2010, with CD4 cell counts >200/μL and no previous or current AIDS events were included. In three baseline CD4 cell count strata (200–349, 350-499, ≥500/μL), we examined the crude time until cART initiation within three years after enrolment according to geographic origin, and multivariable hazard ratios according to geographic origin, gender and HIV-transmission group, with adjustment for baseline age, enrolment period, region of care, plasma viral load, and HBV/HBC coinfection.ResultsAmong 13338 individuals, 9605 (72.1%) were French natives (FRA), 2873 (21.4%) were migrants from sub-Saharan Africa/non-French West Indies (SSA/NFW), and 860 (6.5%) were migrants from other countries. Kaplan-Meier probabilities of cART initiation were significantly lower in SSA/NFW than in FRA individuals throughout the study period, regardless of the baseline CD4 stratum. After adjustment, the likelihood of cART initiation was respectively 15% (95%CI, 1–28) and 20% (95%CI, 2–38) lower in SSA/NFW men than in FRA men who had sex with men (MSM) in the 350-499 and ≥500 CD4 strata, while no difference was observed between other migrant groups and FRA MSM.ConclusionSSA/NFW migrant men living in France with CD4 >350/μL at entry into care are more likely to begin cART later than FRA MSM, despite free access to treatment. Administrative delays in obtaining healthcare coverage do not appear to be responsible