Galaxy formation in the brane world I: overview and first results
C\'esar Hern\'andez-Aguayo, Christian Arnold, Baojiu Li, Carlton M., Baugh

TL;DR
This paper presents hydrodynamical simulations of galaxy formation within the nDGP braneworld model, revealing significant differences from standard gravity in matter clustering and galaxy properties, and exploring baryonic effects in modified gravity.
Contribution
First to simulate galaxy formation in nDGP models with baryonic physics, analyzing their impact on matter clustering and galaxy evolution compared to GR.
Findings
Up to 25% differences in matter power spectra between nDGP and GR.
Baryonic effects significantly influence matter clustering, depending on scale.
Disentangling modified gravity from baryonic feedback is feasible with the proposed method.
Abstract
We carry out ``full-physics'' hydrodynamical simulations of galaxy formation in the normal-branch Dvali-Gabadadze-Porrati (nDGP) braneworld model using a new modified version of the {\sc Arepo} code and the IllustrisTNG galaxy formation model. We simulate two nDGP models (N5 and N1) which represent, respectively, weak and moderate departures from GR, in boxes of sizes and using dark matter particles and initial gas cells. This allows us to explore, for the first time, the impact of baryonic physics on galactic scales in braneworld models of modified gravity and to make predictions on the stellar content of dark matter haloes and galaxy evolution through cosmic time in these models. We find significant differences between the GR and nDGP models in the power spectra and correlation functions of gas, stars and dark matter of up to…
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