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Fuzzy Dark Matter and its Impacts on the Structure and Statistics of Halos

Manouchehri Kousha, Hamed | 2024

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 57413 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Abolhasani, Aliakbar; Namjoo, Mohammad Hossein
  7. Abstract:
  8. According to the standard model of cosmology, around 26% of the universe’s energy content consists of a type of cold matter with minimal non-gravitational interaction, known as ”dark matter.” The standard ”cold dark matter” (CDM) can successfully explain observations across various scales. However, it faces challenges on small (galactic) scales, such as the ”core-cusp problem,” ”the missing satellite problem,” and ”the too-big-to-fail problem.” Fuzzy dark matter is a promising candidate for dark matter. It is characterized by its ultra-light mass, which gives rise to wave effects at astrophysical scales. These effects offer potential solutions to small-scale issues. In this thesis, we explore whether the physics of FDM, especially the quantum pressure leading to the suppression of structure formation on small scales, could have significant effects on the large-scale statistics of matter distribution. Firstly, we use the Effective Field Theory of Large Scale Structures (EFT of LSS) to integrate and represent small-scale physics on large scales using a set of free parameters, such as the speed of sound parameters. We conduct three simulations using FDM initial conditions and varying masses and compare their sound speeds with the standard CDM simulation. Secondly, we use nearest neighbor (NN) analysis as a key statistical tool to examine the structure and statistics of the cosmic web in FDM, CDM-only, and baryonic simulations. Our results, both in the EFT of LSS and in the NN analysis, emphasize that the small-scale physics of FDM could also have measurable effects at large scales
  9. Keywords:
  10. Fuzzy Dark Matter (FDM) ; Cosmological Simulation ; Effective Field Theory ; Nearest Neighbor Query ; Universe Large-Scale Structure

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