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Equation Icon  ∫ 1 4 √ --- [ ν μν α β μ ] S = ------ d x − g (1 + ωu μu )R − K αβu;μu;ν + λ(u μu + 1) , μν 16πGμν μ ν μ ν μ ν where K αβ = c1g gαβ + c2δαδβ + c3δβ δα − c4u u gαβ , (6 )