DHOST inflation with shift-symmetry breaking in the F2 term yields a nearly scale-invariant tensor spectrum and a constant Ω_GW h^2 ≈ 5.2×10^-17, strongly violating the single-field consistency relation.
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Primordial gravitational waves in DHOST inflation
DHOST inflation with shift-symmetry breaking in the F2 term yields a nearly scale-invariant tensor spectrum and a constant Ω_GW h^2 ≈ 5.2×10^-17, strongly violating the single-field consistency relation.