Lattice simulations show that preheating in a Palatini R^2 model with non-minimal coupling fragments the inflaton into oscillons that emit a stochastic gravitational-wave background peaking near 4 GHz.
Amin,Inflaton fragmentation: Emergence of pseudo-stable inflaton lumps (oscillons) after inflation
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Oscillon Formation in Palatini Modified Gravity Theories
Lattice simulations show that preheating in a Palatini R^2 model with non-minimal coupling fragments the inflaton into oscillons that emit a stochastic gravitational-wave background peaking near 4 GHz.