Visitor program

Benjamin L'Huillier

Title: Numerical simulations of structure formation: LCDM and beyond


Numerical simulations have become a powerful tool to study cosmological structure formation.
In this talk, I will first show how the initial conditions can affect the results at low redshift, and introduce the Horizon Run 4 (HR4), a massive cosmological N-body simulation. I will then discuss the rate of halo interactions and the alignment of halo pairs as a function of the environment using the HR4.
I will then move on to cosmology beyond LCDM, and study the alignment of dark matter haloes in modified gravity and dark energy models. I will also assess the potential of the large-scale structure of the Universe to constrain early-Universe models that are undistinguishable from the CMB.
Finally, I will discuss how to reconstruct model-independently the luminosity distance from supernovae, and combine them with BAO measurement from BOSS DR12, to test the FLRW metric and the flatness of the Universe.

Arrival & Departure: 

Monday 19 December


Korea Astronomy and Space Science Institute

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