
TL;DR
This paper investigates the $ u$HDM cosmological model combining sterile neutrinos and MOND gravity, using hydrodynamical simulations to assess its ability to replicate standard cosmological observations and structure formation.
Contribution
It introduces and tests the opt-$ u$HDM model, optimizing its parameters to fit CMB data and exploring its implications for galaxy formation and high-redshift observations.
Findings
The $ u$HDM model can reproduce the expansion history similar to $ m extLambda$CDM.
Optimized opt-$ u$HDM fits Planck CMB data except the fourth peak.
Early structure formation occurs late, challenging high-redshift galaxy explanations.
Abstract
Milgromian Dynamics (MOND) has been particularly successful in predicting scaling relations for galactic systems, namely the baryonic Tully-Fisher for spirals, the Faber-Jackson for ellipticals and the Radial Acceleration Relation for late-type galaxies. Its essential tenet is the modification of the gravity law at low accelerations. Nevertheless, despite MOND's passed tests, the puzzle of the missing mass on galaxy clusters' scales still persists. One proposed scenario to complete this deficit and apply it further to cosmology is the so-called HDM model. It is composed of a sterile neutrino and the MOND gravity. In this Ph.D. thesis, I have put forward this cosmological idea, conducting hydrodynamical simulations to investigate the HDM structure formation. In the debut attempt, the HDM model was proven capable of reproducing the CDM cosmology, imitating the same…
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Taxonomy
TopicsCosmology and Gravitation Theories · Galaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research
