Simulation-based Large Scale structure cosmology
The Good, the Bad and the Ugly
Carol Cuesta-Lazaro
Forward Theory
Gravity
N-body
Initial Conditions
Simulations
Effective Field theories
Galaxies
Empirical
Hydro
Forward Survey
Mask, fibres...
Summarise
Initial Conditions
Observation
Empirical halo-galaxy connection
Identify host Dark matter haloes
Central galaxies : CoM largest sub-halo
Satellite galaxies : particles in halo
N-point functions
Counts-in-cell
Wavelets
Marked tpcfs
kNNs
Voids
Optimise information on cosmological parameters
Robust Surprises
Summarise
Density-split clustering
Quintile-galaxy crosscorrelations
Voids
Clusters
Quintile autocorrelations
Voids
Clusters
Fisher Information
Dark Matter halos Quijote Simulations
BOSS CMASS DR12
0.45 ≤ 𝑧 ≤ 0.6
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