How do galaxies assemble their mass? How do galaxies evolve within the large-scale structure?

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I used multi-zoom cosmological hydrodynamical simulations to quantify the mass assembled by merger and my smooth gas accretion (L'Huillier, Combes & Semelin 2012). 

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Using the Horizon Run 4 (Kim et al. 2015) simulation, I quantified the interaction rate (merger and flyby, L'Huillier, Park & Kim 2015) and the alignments (L'Huillier, Park & Kim 2017) of haloes as a function of the environment (mass and large-scale density). 

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In a study led by David Fernandez-Gil published in Nature Astronomy, we detected a weak but significant alignment signal between the central region of AGN jets as seen by very long baseline interferometry, and the optical shape of host galaxies from various surveys (Fernandez-Gil et al. 2025 Nat. Astron.).