0000000000931105
AUTHOR
David Langlois
Brane cosmology with an anisotropic bulk
In the context of brane cosmology, a scenario where our universe is a 3+1-dimensional surface (the ``brane'') embedded in a five-dimensional spacetime (the ``bulk''), we study geometries for which the brane is anisotropic - more specifically Bianchi I - though still homogeneous. We first obtain explicit vacuum bulk solutions with anisotropic three-dimensional spatial slices. The bulk is assumed to be empty but endowed with a negative cosmological constant. We then embed Z_2-symmetric branes in the anisotropic spacetimes and discuss the constraints on the brane energy-momentum tensor due to the five-dimensional anisotropic geometry. We show that if the bulk is static, an anisotropic brane ca…
New results in the volatile odorous compounds of French cheeses
Les composes volatils odorants de 5 fromages a pâte persillee (3 roqueforts fabriques avec des souches de Penicillium roqueforti differentes, 1 Bleu des Causses et 1 Bleu d'Auvergne) ont ete extraits, separes par chromatographie en phase gazeuse et analyses par spectrometrie de masse. Cent vingt neuf composes ont ete identifies et quantifies