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Simulation-based Large Scale structure cosmology
The Good, the Bad and the Ugly
Carol Cuesta-Lazaro
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![](https://www.mackelab.org/sbi/static/goal.png)
Forward Theory
Gravity
N-body
![](https://planck.ipac.caltech.edu/system/news_items/images/9/thumb/planck13-001_Tn.jpg?1363903743)
Initial Conditions
Simulations
Effective Field theories
Galaxies
Empirical
Hydro
Forward Survey
![](https://dq0hsqwjhea1.cloudfront.net/M33-DESI-First-Light-600px.jpg)
Mask, fibres...
![](https://pbs.twimg.com/media/Fip9la7XgAA5OxG.jpg:large)
Summarise
![](https://upload.wikimedia.org/wikipedia/commons/thumb/e/e9/Planck_2018_Linear_Matter_Power_Spectrum.pdf/page1-1200px-Planck_2018_Linear_Matter_Power_Spectrum.pdf.jpg)
![](https://scitechdaily.com/images/Slice-DESI-3D-Map-of-Galaxies.jpg)
![](https://planck.ipac.caltech.edu/system/news_items/images/9/thumb/planck13-001_Tn.jpg?1363903743)
Initial Conditions
Observation
![](https://scitechdaily.com/images/Slice-DESI-3D-Map-of-Galaxies.jpg)
Empirical halo-galaxy connection
![](https://physics.yale.edu/sites/default/files/event-images/screen_shot_2019-03-31_at_10.27.47_pm.jpg)
Identify host Dark matter haloes
Central galaxies : CoM largest sub-halo
Satellite galaxies : particles in halo
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![](https://newscenter.lbl.gov/wp-content/uploads/2022/01/allframe-1000mpc-960x540-1.gif)
N-point functions
Counts-in-cell
Wavelets
Marked tpcfs
kNNs
Voids
Optimise information on cosmological parameters
Robust Surprises
Summarise
![](https://upload.wikimedia.org/wikipedia/commons/thumb/e/e9/Planck_2018_Linear_Matter_Power_Spectrum.pdf/page1-1200px-Planck_2018_Linear_Matter_Power_Spectrum.pdf.jpg)
![](https://scitechdaily.com/images/Slice-DESI-3D-Map-of-Galaxies.jpg)
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Density-split clustering
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Quintile-galaxy crosscorrelations
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Voids
Clusters
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Quintile autocorrelations
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Voids
Clusters
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Fisher Information
Dark Matter halos Quijote Simulations
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BOSS CMASS DR12
0.45 ≤ 𝑧 ≤ 0.6
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The Good
The Bad
The Ugly
Simulations can model non-linear clustering
Forward modelling + ML = constraints from any summary
Ad-hoc galaxy-halo connection
Halos are social constructs
Limited number of simulations, prior limited
Difficult to estimate robust model errors
deck
By carol cuesta
deck
- 165