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

[Pooyan Goodarzi]

Reminder: Yanhui's talk happening in ~1 hour.

On Sun, Mar 2, 2025 at 16:49 Pooyan Goodarzi <pooyan.goodarzi at email.ucr.edu>
wrote:

> 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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