2014 Nous étudions la génération d'une entropie primordiale dans une cosmologie à cinq dimensions. Nous montrons que cette génération dépend crucialement de l'équation d'état et de la propriété de la viscosité d'être constante ou dépendante du temps. Abstract. 2014 The generation of primordial entropy is studied in a five-dimensional cosmological model, the generation is shown to depend critically on the equation of state and whether or not the bulk viscosity is constant or time dependent. J.

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... ys. France 50 (1989) 1821-1826 15 JUILLET 1989, Classification Physics Abstracts 98.80D Notations P = pressure e = energy density R3 = three space scale factor a = fifth dimensional scale factor à = coefficient of bulk viscosity R3, a . _ dR3 da d2R3 d2a = dt' dt ; R3, a3 = dt2 ' dt2 S = entropy Tk = absolute temperature K3 = space curvature k5 = 8 7TG5 G5 = five dimensional gravity constant a a a0 a' a° = constants in a = ao + -°3 2 t 32 at f3t 15 At 32 e , e , e = exponential = exp «t, exp {3t, exp 15 At C = 1 = speed of light A -k5s Ro, ao = constants in R° eat, ao ef3t, Ro t T = Tm, g,"' = trace of Tuv FI a, {3 = Greek symbols Article published online by EDP Sciences and available at http://dx.