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Self-acceleration in scalar-bimetric theories

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FIG. 1: Background quantities for a symmetric solution of the form (46), as a function of redshift
FIG. 2: Background quantities for a symmetric solution of the form (46). Upper panel: ratio of the scalar field energy density to the dark matter energy density
FIG. 3: Background quantities for a solution of the form (52), where s 2 /s 1 is not constant.
FIG. 4: Background quantities for a solution of the form (61), where the different metrics have different conformal times (i.e., are not proportional), but r 1 → 1 at z = 0.
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