florpi
The What? How? And Why?
And really, Why?
https://florpi.github.io/
IAIFI Fellow
Carol Cuesta-Lazaro
simulated data
Complex non-Gaussian distributions
Non-linear forward models
(Image Credit: D. Schlegel/Berkeley Lab using data from DESI)
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
#1 Field-level likelihoods for galaxy surveys
Siddharth Mishra-Sharma
#2 Probabilistic reconstruction of the cosmic web
Core Park
Nayantara Mudur
Victoria Ono
Yueying Ni
#3 Faster, invertible and more accurate simulators
Sarah Jeffreson
Chirag Modi
Samples
Parametric PDF
Maximize the likelihood of the training samples
Reverse diffusion: Denoise previous step
Forward diffusion: Add Gaussian noise (fixed)
A person half Yoda half Gandalf
Score
"A point cloud approach to generative modeling for galaxy surveys at the field level"
arXiv:2311.17141
Carolina Cuesta-Lazaro and Siddharth Mishra-Sharma
2PCF
Mean pairwise
velocity
kNN
2PCF
kNN
arxiv:2107.00630
arxiv:2208.11970
Maximum Likelihood = Denoising
"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
1 to Many:
Fast and differentiable N-body sims
Inverting dynamics
More accurate hydro sims: Resolving star formation rates
~10-100 pc
Molecular clouds
where stars form
~10-50 kpc
Galaxies
where clouds form
TNG50 ~50 Mpc
Cosmic web
(where galaxies form)
Adapted from: "Learning the learning the Universe" by Jake Bennet
MXXL ~ 4 Gpc
High Res Sim
Springel and Hernquist 03
Gas Surface Density
SFR Surface Density
Nbody
Slow
Non-differentiable
Particle mesh
Accurate
Fast
Differentiable
Missing small scales
Nbodyify
Fast
Differentiable
Accurate
"Nbodyify: adaptive mesh corrections for PM simulations"
Carolina Cuesta-Lazaro and Chirag Modi (in prep)
Gravitational evolution ODE
Particle-mesh
Hybrid Simulator
#2 Probabilistic reconstruction of the cosmic web
#1 Field-level likelihoods for galaxy surveys
#3 Faster, invertible and more accurate simulators
cuestalz@mit.edu