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We demonstrate gravitational wave speed compliance in causal structures, indicating implications for theories of gravity.
We demonstrate that RCD satisfies the gravitational wave speed constraint |c_T - c|/c < 1e-15 from GW170817. The tensor mode propagates on the conformally related Einstein metric with c_T = c exactly, while scalar disformal propagation applies only to C excitations. This result holds for the minimal disformal action and remains exact under kinetic completion B' (Paper VII).
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Arturo Cerezo (2026) studied this question.
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