In f(Q,φ) gravity with nonminimal coupling, De Sitter inflation works only for 10^{-3} ≲ ξ ≲ 10^{-2} while a Cosh model gives ns ≈ 0.965-0.967 and r ≈ 0.017-0.018 at N=60, matching observations.
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Inflationary Scenarios in $f(Q,\phi)$ Gravity with Scalar Field Coupling
In f(Q,φ) gravity with nonminimal coupling, De Sitter inflation works only for 10^{-3} ≲ ξ ≲ 10^{-2} while a Cosh model gives ns ≈ 0.965-0.967 and r ≈ 0.017-0.018 at N=60, matching observations.