Nikolaos Tetradis

Standard frameworkBasic assumptions: Homogeneity and isotropyds 2 = −dt 2 + a 2 (t)δ ij dx i dx j(ȧ ) 2= 8πGa 3 ρäa = − 4πG (ρ + 3p)3Inhomogeneities can be treated as small perturbations of thisbackgroundIndications for the acceleration of the cosmological expansion1 Distant supernovae2 Power spectrum of the galaxy distribution3 Cosmic microwave backgroundFor acceleration: p < −ρ/3N. Tetradis University of AthensThe inhomogeneity of the Universe and the cosmological model