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Gravitational Dark Matter Production from Spectator Field in $R^2$-Higgs Inflation
We investigate the cosmological gravitational dark matter production of spectator field $χ$ in the multifield $R^2$-Higgs inflation. The spectator field $χ$ couples to gravity only through a non-minimal coupling $ξ_χχ^2R$ and serves as a dark matter (DM) candidate. Working consistently in the Einste
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