The paper claims three parameterized dark energy equations of state in f(Q,C) gravity fit expansion data and support a deceleration-to-acceleration transition, but the modified gravity parameters themselves are not constrained.
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Constraining model parameters in f(Q,C) gravity: Observational analysis and geometric diagnostics
The paper claims three parameterized dark energy equations of state in f(Q,C) gravity fit expansion data and support a deceleration-to-acceleration transition, but the modified gravity parameters themselves are not constrained.