Welcome to Kun Universe!

Kun Universe is an extensive simulation suite designed for the emulator construction of the China Space Station Telescope (CSST) optical survey, known as CSST Emulator. In Chinese mythology, Kun (鲲) is an extraordinary and mythical creature. It is depicted as an immense fish dwelling in the boundless northern sea. Kun has an extraordinary ability - it can transform into a gigantic bird named Peng (鹏). This transformation is a symbol of great power and the potential for amazing change. The legend of Kun has been perpetuated through the ages in Chinese culture, symbolizing the grandiosity of nature and the infinite possibilities within the realm of mythology and human imagination. We earnestly hope that the Kun Universe will grow to an enormous scale and possess rich variability. Wish this suite can offer you a novel perspective on the universe and the future of cosmology!

Kun Universe includes 129 high-resolution N-body simulations, which are generated by the modified version of the Gadget-4 code with 129 different cosmologies. The broad ranges of cosmological parameters are shown as followed.

Parameter	Lower Limit	Upper Limit
\(\Omega_b\)	0.04	0.06
\(\Omega_{cb}\)	0.24	0.40
\(H_0\)	60	80
\(n_s\)	0.92	1.00
\(A_s\times 10^{9}\)	1.7	2.5
\(w\)	-1.3	-0.7
\(w_a\)	-0.5	0.5
\(\sum M_{\nu}\)	0	0.3

The detailed cosmologies can be found in the Cosmology section.

Contents

Data

• Cosmology
• Data Products
  • Overview
  • Particle Data
    • Snapshot
    • Particle Lightcone
  • Halo Data
    • FOF-SubFind Halo
    • Rockstar Halo
  • Field Data
    • Matter Density Field
    • Full-sky Mass Map
    • Weak Lensing Convergence Map (Born Approximation)
  • Table of Data Products
• Visualization
• Citation
• Projects
  • Publication

Acknowledgement

Feel free to contact <chyiru@sjtu.edu.cn> or leave an issue on the GitHub if you have any questions.