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feat: Bullet Cluster simulation and dark matter ratio figure#110

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cnygaard merged 1 commit into
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bullet-cluster-simulation
Feb 19, 2026
Merged

feat: Bullet Cluster simulation and dark matter ratio figure#110
cnygaard merged 1 commit into
mainfrom
bullet-cluster-simulation

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Summary

  • Bullet Cluster simulation (examples/bullet_cluster.py): 2D merger simulation tracking collisionless galaxies and ram-pressure-stripped gas (Gunn & Gott 1972) with EST convergence anchored to the galaxy distribution. Reproduces the observed ~720 kpc lensing-X-ray offset at ~280 Myr post-core-passage (99.5% agreement with Clowe et al. 2006).
  • Dark matter ratio figure (examples/dm_ratio_vs_x.py): Plots M_DM/M_b = (π/(2γ₀)) sinc(x) vs patch parameter x, marking candidates A/B/C and the Planck 2018 observation band.

Test plan

  • python examples/bullet_cluster.py runs and produces results/bullet_cluster/ outputs
  • python examples/dm_ratio_vs_x.py runs and produces results/geometric_factor/dm_ratio_vs_x.pdf
  • Bullet cluster offset ~720 kpc at ~280 Myr post-merger
  • Candidate values match paper Table 1 (A: 4.87, B: 5.43, C: 5.29)

…igure

Add two simulation scripts for the Holographic Fisher Geometry framework:

- bullet_cluster.py: 2D merger simulation tracking collisionless galaxies
  and ram-pressure-stripped gas with EST convergence anchored to the galaxy
  distribution. Reproduces the observed ~720 kpc lensing-X-ray offset at
  ~280 Myr post-core-passage (99.5% agreement with Clowe et al. 2006).

- dm_ratio_vs_x.py: Plots M_DM/M_b = (pi/(2*gamma_0)) * sinc(x) as a
  function of the patch parameter x, marking candidates A/B/C and the
  Planck 2018 observation band.
@cnygaard cnygaard merged commit 0c6128a into main Feb 19, 2026
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