In Rastall gravity the collapse threshold for primordial black holes shifts and their abundance becomes exponentially sensitive to the Rastall parameter even inside current observational bounds.
Inflating Horizon of Particle Astrophysics and Cosmology
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Primordial Black Hole Formation in Rastall Gravity: Shifted Collapse Threshold and Exponential Abundance Sensitivity
In Rastall gravity the collapse threshold for primordial black holes shifts and their abundance becomes exponentially sensitive to the Rastall parameter even inside current observational bounds.