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Abstract
Collisionless simulations of structure formation with significant local primordial non-Gaussianities at Mpc scales have shown that a non-Gaussian tail favouring underdensities, with a negative f NL parameter, can significantly change the merging history of galaxy-sized dark matter halos, which then typically assemble later than in vanilla ΛCDM. Moreover, such a small-scale negative f NL could have interesting consequences for the cosmological S 8 tension. Here, we complement our previous work on collisionless simulations with new hydrodynamical simulations of galaxy formation in boxes of 30 Mpc/h, using the RAMSES code. In particular, we show that all feedback prescriptions being otherwise identical, simulations with a negative f NL ∼ -1000 on small scales, hence forming galaxies a bit later than in vanilla ΛCDM, allow to form simulated galaxies with more disky kinematics than in the vanilla case. Therefore, such small-scale primordial non-Gaussianities could potentially help alleviate, simultaneously, tensions in cosmology and galaxy formation. These hydrodynamical simulations on small scales will need to be complemented with larger box simulations with scale-dependent non-Gaussianities, to statistically confirm these trends and explore their observational consequences in further detail.
Original language | English |
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Article number | 036 |
Number of pages | 14 |
Journal | Journal of Cosmology and Astroparticle Physics (JCAP) |
Volume | 2023 |
Issue number | 9 |
DOIs | |
Publication status | Published - 18 Sept 2023 |
Austrian Fields of Science 2012
- 103004 Astrophysics
- 103044 Cosmology
- 103043 Computational physics
Keywords
- Astrophysics - Cosmology and Nongalactic Astrophysics
- Astrophysics - Astrophysics of Galaxies
- cosmological simulations
- galaxy formation
- non-gaussianity
- hydrodynamical simulations
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Dive into the research topics of 'Hydrodynamical simulations of galaxy formation with non-Gaussian initial conditions'. Together they form a unique fingerprint.Projects
- 1 Finished
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COSMO_SIMS: Astrophysics for the Dark Universe: Cosmological simulations in the context of dark matter and dark energy research
1/10/20 → 31/08/22
Project: Research funding