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<p>Hi all, <br>
<br>
We will have a Cosmology <span class="gmail-il">PASS</span> <span
class="gmail-il">talk</span> tomorrow by Yanhui. Please join
us at noon (from 12:00 pm to 1:00 pm) in the Nebula Room (PHYS
3027).<br>
<br>
<br>
</p>
<div align="center"><b>Yanhui Yang, PhD student</b><br>
Monday, 12:00 pm, Nebula Room (PHYS 3027)<br>
<b><span>A 10-Parameter Simulation Suite for Cosmological
Emulation</span></b><br>
<br>
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 <a
href="https://github.com/astro-YYH/GokuEmu"
class="moz-txt-link-freetext">https://github.com/astro-YYH/GokuEmu</a>,
providing a valuable resource for cosmological parameter
inference and model testing.<br>
<div><br>
<br>
</div>
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<br>
If you’re interested in sharing your work as a speaker, please
feel free to add your name to this spreadsheet [<a
href="https://docs.google.com/spreadsheets/d/1N3ncf43jdB6aHYHhyWmyHMycxDg4_phHZXLkQvviO0o/edit?usp=sharing"
target="_blank">Google Sheet</a>].<br>
<div><br>
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Best,<br>
Pooyan<br>
Physics and Astronomy Student Seminar (<span class="gmail-il">PASS</span>)
<br>
<a href="https://ucrpass.arxiv.social/" target="_blank"
class="moz-txt-link-freetext">https://ucrpass.arxiv.social</a></div>
<p></p>
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