Reconstructing the cosmic web
florpi
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https://florpi.github.io/
IAIFI Fellow
Carol Cuesta-Lazaro
Victoria Ono, Core Francisco Park, Nayantara Mudur and Yueying Ni
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![](https://iaifi.org/images/iaifi-logo-black-noborder-hires.jpg)
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1 to Many:
Galaxy distribution
Underlying Dark matter distribution ?
![](https://s3.amazonaws.com/media-p.slid.es/uploads/993552/images/10824461/fiducial_imshows-1.png)
"Probabilistic Reconstruction of Dark Matter fields from galaxies using diffusion models"
arXiv:2311.08558
Core Francisco Park, Victoria Ono, Nayantara Mudur, Yueying Ni, Carolina Cuesta-Lazaro
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A 2D animation of a folk music band composed of anthropomorphic autumn leaves, each playing traditional bluegrass instruments, amidst a rustic forest setting dappled with the soft light of a harvest moon
Maximize the likelihood of the training samples
Model
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Training Samples
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Generative Models 101
Trained Model
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Generate Novel Samples
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Evaluate probabilities
Anomaly detection, model comparison...
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Reverse diffusion: Denoise previous step
Forward diffusion: Add Gaussian noise (fixed)
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A person half Yoda half Gandalf
Diffusion Models
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Truth
Sampled
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Observed
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![](https://www.universetoday.com/wp-content/uploads/2011/06/molecular_cloud.jpg)
~10-100 pc
Molecular clouds
where stars form
Hydro sims:
A matrioska of scales
![](https://smd-cms.nasa.gov/wp-content/uploads/2023/06/spiral-galaxy-jpg.webp)
~10-50 kpc
Galaxies
where clouds form
![](https://s3.amazonaws.com/media-p.slid.es/uploads/993552/images/11040353/Comparison-of-the-three-TNG-simulations-TNG50-TNG100-and-TNG300-For-each-projected.png)
TNG50 ~50 Mpc
Cosmic web
(where galaxies form)
![](https://wwwmpa.mpa-garching.mpg.de/galform/virgo/millennium/seqB_037a.jpg)
MXXL ~ 4 Gpc
Stay tuned: Huybrid ML simulators for the ISM
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High Res Sim
Springel and Hernquist 03
Reconstructing cosmic web
By carol cuesta
Reconstructing cosmic web
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