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Extended Cuscuton as Dark Energy
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abstract
Late-time cosmology in the extended cuscuton theory is studied, in which gravity is modified while one still has no extra dynamical degrees of freedom other than two tensor modes. We present a simple example admitting analytic solutions for the cosmological background evolution that mimics $\Lambda$CDM cosmology. We argue that the extended cuscuton as dark energy can be constrained, like usual scalar-tensor theories, by the growth history of matter density perturbations and the time variation of Newton's constant.
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Cited by 1 Pith paper
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Cosmological constraints and standard sirens forecasts for non-dynamical dark energy in Horndeski gravity
Standard sirens from third-generation detectors could measure H0 to 0.21% in Extended Cuscuton models, but the forecast omits the modified GW luminosity distance.
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