12 citations · 29 across the 11 of their papers we have counts for
13 papers
Accelerating massive ensembles of ordinary differential equations
Lawrence Berry, Will Handley, Oliver Hahn +1
Solving large ensembles of small, independent ordinary differential equations (ODEs) is a common task in computational science and engineering, arising for example in Bayesian para…
Bridging perturbation theory and simulations: initial conditions and fast integrators for cosmological simulations
Oliver Hahn
These lecture notes provide an introduction to the generation of initial conditions for cosmological N-body simulations. Starting from the definition and properties of Gaussian ran…
JZ-Tree: GPU friendly neighbour search and friends-of-friends with dual tree walks in JAX plus CUDA
Jens Stücker, Oliver Hahn, Lukas Winkler +2
Algorithms based on spatial tree traversal are widely regarded as among the most efficient and flexible approaches for many problems in CPU-based high-performance computing (HPC).…
DISCO-DJ II: a differentiable particle-mesh code for cosmology
Florian List, Oliver Hahn, Thomas Flöss +1
The mildly non-linear regime of cosmic structure formation holds much of the information that upcoming large-scale structure surveys aim to exploit, making fast and accurate predic…
Majorization theory for quasiprobabilities
Twesh Upadhyaya, Zacharie Van Herstraeten, Jack Davis +3
The question of how to characterize disorder arises in a wide variety of settings, including information theory, economics, and quantum thermodynamics. The theory of majorization p…
Differentiable Halo Mass Prediction and the Cosmology-Dependence of Halo Mass Functions
Jim Buisman, Florian List, Oliver Hahn
Modern cosmological inference increasingly relies on differentiable models to enable efficient, gradient-based parameter estimation and uncertainty quantification. Here, we present…
Accurate -body simulations with local Primordial non-Gaussianities: initial conditions and aliasing
Adrian G. Adame, Santiago Avila, Violeta Gonzalez-Perez +3
New generation galaxy surveys targeting constraints on local primordial non-Gaussianity (PNG) demand -body simulations that accurately reproduce its effects. In this work, we ex…
BullFrog: Multi-step perturbation theory as a time integrator for cosmological simulations
Cornelius Rampf, Florian List, Oliver Hahn
Modelling the cosmic large-scale structure can be done through numerical N-body simulations or by using perturbation theory. Here, we present an N-body approach that effectively im…
cosmICweb: Cosmological Initial Conditions for Zoom-in Simulations in the Cloud
Michael Buehlmann, Lukas Winkler, Oliver Hahn +2
We present the online service cosmICweb (COSMological Initial Conditions on the WEB) - the first database and web interface to store, analyze, and disseminate initial conditions fo…
A deep learning framework for jointly extracting spectra and source-count distributions in astronomy
Florian Wolf, Florian List, Nicholas L. Rodd +1
Astronomical observations typically provide three-dimensional maps, encoding the distribution of the observed flux in (1) the two angles of the celestial sphere and (2) energy/freq…
DISCO-DJ I: a differentiable Einstein-Boltzmann solver for cosmology
Oliver Hahn, Florian List, Natalia Porqueres
We present the Einstein-Boltzmann module of the DISCO-DJ (DIfferentiable Simulations for COsmology - Done with JAX) software package. This module implements a fully differentiable…
Stochastic Super-resolution of Cosmological Simulations with Denoising Diffusion Models
Andreas Schanz, Florian List, Oliver Hahn
In recent years, deep learning models have been successfully employed for augmenting low-resolution cosmological simulations with small-scale information, a task known as "super-re…
Starting Cosmological Simulations from the Big Bang
Florian List, Oliver Hahn, Cornelius Rampf
The cosmic large-scale structure (LSS) provides a unique testing ground for connecting fundamental physics to astronomical observations. Modeling the LSS requires numerical -bod…