The nature of dark matter and dark energy is one of the most important unsolved problems in cosmology. The distribution of dark matter at cosmological scales, galactic scales and subgalactic scales all reveal complementary aspects of the physics of dark matter. The broadest set of probes for dark energy are necessary to constrain the dark energy equation of state and to distinguish dark energy models. In this thesis, I examine the counts-in- cells probability distribution functions that describe dark matter halos in the Dark Energy Universe Simulations (DEUS) and describe the measurements between redshifts z = 0 to z = 4 on both linear and non-linear scales. For cosmologies explored in the DEUS simulations, the percentage differences between PDF statistics for the RPCDM and wCDM dark energy cosmologies relative to ΛCDM generally increases with redshift from a few percent to significantly larger percentages at z = 4. Applying our method to simulations and galaxy surveys can thus provide a useful way to distinguish among dark energy models and cosmologies in general. The second research study presented here concerns the flux ratio anomaly in the quadruply imaged strong gravitational lens, B1422+231, in which the contribution of 10 − 103M0 primordial black holes (PBHs) as a potential dark matter constituent is examined. Our analysis of the ALMA observations and PBH microlensing simulations shows that the anomalous flux density ratio for B1422+231 can be explained by a lens model with a significant fraction of dark matter being PBHs.
Topic: Di Wen Thesis Defense
Time: Oct 7, 2020 09:05 AM Central Time (US and Canada)
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