In static f(R) gravity, the sign of an effective matter-plus-scalaron convergence term determines whether the radial metric ratio B/A increases or decreases, and equal endpoint values force the term to vanish.
The Raychaudhuri equation in inhomogeneous FLR W space- time: Af(R)-gravity model,
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Scalaron-modified null focusing and radial monotonicity in static f(R) gravity
In static f(R) gravity, the sign of an effective matter-plus-scalaron convergence term determines whether the radial metric ratio B/A increases or decreases, and equal endpoint values force the term to vanish.