The work derives background-level constraints showing that potential-driven early dark energy in F(R) gravity is generically excluded by local gravity tests.
Consequently, F (R) is a convex and monotonically increasing function, and FR(R) is a monotonically increasing function
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Theoretical and observational constraints on early dark energy in $F(R)$ gravity
The work derives background-level constraints showing that potential-driven early dark energy in F(R) gravity is generically excluded by local gravity tests.