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.
L., Scalar fields in cosmology: dark matter and inflation, Journal of Physics: Conference Series 761, 10.1088/1742-6596/761/1/012076 (2016)
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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.