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The proper energy density (a) and the Euclidean energy density (b), for ψ0=1

The proper energy density (a) and the Euclidean energy density (b), for ψ0=1

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For the Friedmann–Robertson–Walker (FRW) Universe with negative curvature, sustained by a spontaneous Z 2− symmetry breaking scalar field, depending on time alone, we have derived the Einstein–Gordon system of equations. For physically relevant cases, the matter-curvature system have been numerically analyzed.