PIRSA:25090044 Scientific Series Cosmology

DOI10.48660/25090044

Series: Cosmology and Gravitation

Kravtsov, A. (2025). Stress-testing LCDM model on small scales. Perimeter Institute. https://pirsa.org/25090044

Kravtsov, Andrey. Stress-testing LCDM model on small scales. Perimeter Institute, Sep. 16, 2025, https://pirsa.org/25090044 

@misc{ pirsa_PIRSA:25090044,
  doi = {10.48660/25090044},
  url = {https://pirsa.org/25090044},
  author = {Kravtsov, Andrey},
  keywords = {Cosmology},
  language = {en},
  title = {Stress-testing LCDM model on small scales},
  publisher = {Perimeter Institute},
  year = {2025},
  month = {sep},
  note = {PIRSA:25090044 see, \url{https://pirsa.org}}
}

Abstract

I will present a galaxy formation model within the Lambda Cold Dark Matter (LCDM) framework that is calibratedvon the results of galaxy formation simulations and some of the empirical properties of nearby dwarf galaxies.
I will then use the model to interpret a number of ostensible challenges to the LCDM framework, such as thev"too-big-too-fail problem", "central density problem", the Milky Way "plane of satellites" problem, and the "dark matter deficient" ultra-diffuse galaxies. I will show that none of these pose a serious challenge to LCDM within the current observational uncertainties because the corresponding observations can be explained within the standard galaxy formation modeling framework. At the same time, dwarf galaxies provide strong constraints on deviations from LCDM power spectrum on small scales of up to k~100/Mpc.

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