Nikolaos Tetradis
Nikolaos Tetradis
Nikolaos Tetradis
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Define the quadruplet⎛⎛ ⎞ϕ 1 (k, η)ϕ 2 (k, η)= e −η ⎜ ϕ 3 (k, η)⎟⎝ ⎠⎜⎝ϕ 4 (k, η)where η = ln a(τ).The equations of motion becomeδ CDM (k, η)− θ CDM(k, η)Hδ BM (k, η)− θ BM(k, η)H⎞,⎟⎠∂ η ϕ a (k, η) + Ω ab ϕ b (k, η) = e η γ abc (k, −k 1 , −k 2 )ϕ b (k 1 , η)ϕ c (k 2 , η).The indices a, b, c take values 1, . . .,4. Repeated momenta areintegrated over, while repeated indices are summed over.N. <strong>Tetradis</strong> University of AthensThe inhomogeneity of the Universe and the cosmological model