[Physics-grads-open] PASS talk on Cosmological Simulations

[Pooyan Goodarzi]

Hi all,

We will have a Cosmology PASS talk tomorrow by Yanhui. Please join us 
at noon (from 12:00 pm to 1:00 pm) in the Nebula Room (PHYS 3027).


*Yanhui Yang, PhD student*
Monday, 12:00 pm, Nebula Room (PHYS 3027)
*A 10-Parameter Simulation Suite for Cosmological Emulation*

   We present Goku, a suite of cosmological N-body simulations, and the 
corresponding 10-dimensional emulator, GokuEmu, for the nonlinear matter 
power spectrum. The simulations span the base parameters of ΛCDM 
cosmology and its extensions, including dynamical dark energy (w_0, 
w_a), the sum of the neutrino masses (m_ν), the effective number of 
neutrinos (N_eff), and the running of the scalar spectral index (α_s). 
Designed within the MF-Box framework, which integrates multi-scale and 
multi-fidelity simulations, the suite includes high-fidelity simulations 
evolving 3000^3 particles in 1 (Gpc/h)^3 volumes and low-fidelity 
simulations with 750^3 particles across varying box sizes. This approach 
achieves percent-level accuracy in high-likelihood regions and 5% 
accuracy across broader parameter ranges, while reducing computational 
costs by over 90% compared to single-fidelity methods. The emulator is 
valid for redshifts z ≤3 and scales 0.01 ≲ k/(hMpc^−1) ≲ 10. Beyond the 
matter power spectrum, the simulations also support analyses of other 
statistical measures, such as the halo mass function. The emulator and 
its training data are publicly available at 
https://github.com/astro-YYH/GokuEmu, providing a valuable resource for 
cosmological parameter inference and model testing.



If you’re interested in sharing your work as a speaker, please feel free 
to add your name to this spreadsheet [Google Sheet 
<https://docs.google.com/spreadsheets/d/1N3ncf43jdB6aHYHhyWmyHMycxDg4_phHZXLkQvviO0o/edit?usp=sharing>].


Best,
Pooyan
Physics and Astronomy Student Seminar (PASS)
https://ucrpass.arxiv.social
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