Fiducial IllustrisTNG, MillenniumTNG, and Simba models under-predict the PTA gravitational-wave background by ~2x, and feedback prescription changes alter the predicted amplitude by factors of 2-10.
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Implications of the nanoHertz Gravitational-Wave Background for Galactic Feedback and Massive Black Hole Growth
Fiducial IllustrisTNG, MillenniumTNG, and Simba models under-predict the PTA gravitational-wave background by ~2x, and feedback prescription changes alter the predicted amplitude by factors of 2-10.