In f(R,T²) gravity, the growth index decreases with redshift and approaches standard matter-dominated values at early times, with fσ8 predictions staying within ±2σ observational bounds for viable coupling parameters α and n=1/2 or 1/4.
Myrzakulov, Frw cosmology inf(R,T)gravity, The European Physical Journal C72, 10.1140/epjc/s10052-012-2203-y (2012)
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Cosmological structure growth in energy-momentum squared gravity
In f(R,T²) gravity, the growth index decreases with redshift and approaches standard matter-dominated values at early times, with fσ8 predictions staying within ±2σ observational bounds for viable coupling parameters α and n=1/2 or 1/4.