A metric-affine version of quadratic DHOST theories is derived and reduced to a one-function family that satisfies degeneracy conditions and light-speed gravitational wave propagation.
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In f(T) gravity with power-law and exponential models, a fiber inflation potential with ultra slow-roll phase amplifies the primordial curvature power spectrum on small scales to enable primordial black hole formation consistent with CMB constraints.
In this two-field completion, trajectories connected to the Starobinsky solution keep entropy modes suppressed so that curvature and tensor perturbations remain effectively single-field Starobinsky-like.
citing papers explorer
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Degenerate higher-order scalar-tensor theories in metric-affine gravity
A metric-affine version of quadratic DHOST theories is derived and reduced to a one-function family that satisfies degeneracy conditions and light-speed gravitational wave propagation.
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Primordial black hole production in scalar field inflation within $f(T)$ gravity
In f(T) gravity with power-law and exponential models, a fiber inflation potential with ultra slow-roll phase amplifies the primordial curvature power spectrum on small scales to enable primordial black hole formation consistent with CMB constraints.
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Robustness of Starobinsky inflation in a minimal two-field scalar-tensor completion
In this two-field completion, trajectories connected to the Starobinsky solution keep entropy modes suppressed so that curvature and tensor perturbations remain effectively single-field Starobinsky-like.