ELFT HÍRADÓ

[Somogyi Gábor <somogyi.gabor AT wigner.hun-ren.hu>]

Wigner FK RMI Elméleti Osztály Szemináriuma
Tisztelettel meghívjuk


        Pál Balázs
        (ELTE, HUN-REN Wigner FK)


"Cosmological simulations in pathological geometries and how to make them”


címmel tartandó szemináriumára.


Kivonat:



Cosmological N-body simulations are fundamental tools for studying the 
non-linear evolution of large-scale structure, yet the vast majority 
adopt periodic cubic (T^3) boundary conditions. This choice breaks 
rotational invariance, prevents angular momentum conservation, and 
introduces artificial correlations at scales comparable to the box size. 
The StePS simulation framework and its companion initial condition 
generator stepsic overcome these limitations by compactifying open (R^3) 
and cylindrical (S^1 x R^2) domains via stereographic projection, 
providing an end-to-end pipeline for cosmological simulations that 
preserve the relevant continuous symmetries while maintaining radially 
varying mass resolution through a natural zoom-in configuration. The 
pipeline supports Lagrangian perturbation theory up to second order 
across spherical, cylindrical, and anisotropic slab geometries --- 
geometries that no other cosmological N-body pipeline supports. The 
first S^1 x R^2 LCDM simulation demonstrates that the cylindrical 
topology faithfully reproduces both linear and non-linear structure 
formation. This opens a pathway toward self-consistent studies of 
filamentary environments and anisotropic cosmological models in 
geometries that respect their intrinsic symmetries.



Helye: Wigner FK RMI III. ép. Tanácsterem
Ideje: 2026 április 24. péntek d.u. 2 óra

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                  Somogyi Gábor