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.
Annala, Higgs inflation and higher-order gravity in Palatini formulation, Master’s thesis, Helsinki U.
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Numerical simulations show oscillons form and dominate for an extended period in Palatini gravity with non-minimal coupling, producing ultra-high-frequency gravitational waves potentially accessible to future detectors.
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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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Oscillon Formation in Palatini Modified Gravity Theories
Numerical simulations show oscillons form and dominate for an extended period in Palatini gravity with non-minimal coupling, producing ultra-high-frequency gravitational waves potentially accessible to future detectors.