Hongfei Yu

An undergraduate major in physics (Cosmology) / Member of the DESI Collaboration (Sponsor: Prof. Wenjuan Fang).

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Weekly Research Summary

Date: 2025.9.1-2025.9.7

1. Overview

Last week I successfully reproduced the Fig.2 in the paper.

2. Activities and Progress

2.1 Code Review

  • Reproduced the Fig.2-e,f in the paper:

The main difference with the method last week is the reconstruction parameter 'is_recon_safe' and 'is_recon'. The paper use 'is_recon', which means it consider all galaxies in EUCLID, include those near the boundary.
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And here's the difference between my reproduce-result and the figure data in the paper.
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I also tested the other two group of samples called low-mid-sigma and high-mid-sigma (defined in the paper Extended Data Table 1)
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And all galaxy samples in a same axes, with four types of webs, respectively:
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  • Divided samples in other similar methods in the paper. And calculate their 2PCCF. Results are showed in the LaTeX Report.

Here's a preview:
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  • Calculated the bias(z-weighting) using fit_bias.py.

3. Challenges

Calculating bias is a totally unfamiliar work for me. I read the definition, tried fit_bias.py, install Corrfunc and finally get a fig, but I cannot explain it fluently.

The bias of disk galaxies:
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4. AI Tools Utilized

  • Chat-GPt-4o. Via Copilot to help me reading codes

  • Claude Sonnet 4. Coding...