ODSL Days

Wednesday 8 Jul 2026, 09:15 → 20:30 Europe/Berlin

X5/1.1.18b (big seminar room) (Max Planck Institute for Extraterrestrial Physics)

Our goal to connect our data science interests across the Origins 2 science program! We hope this event will help us better organize future events to serve our growing community. 🌱

Event organized by:
ODSL coordinators:
- Lukas Heinrich (TUM)
- Daniel Grüen (LMU)
ODSL pds:
- Jed Homer (LMU)
- Nicole Hartman (TUM)

Previous kickoff event for ODSL in ORIGINS1: https://indico.ph.tum.de/event/7153/

09:15 → 09:25 Intro

Speaker: Lukas Heinrich (TUM)

matrix.pdf

ODSL_Days_Intro.pdf

09:30 → 09:50 Neural Simulation-Based Inference for the KeV-Scale Sterile Neutrino Search with TRISTAN at KATRIN (15'+5')

Abstract: Following the completion of its neutrino mass measurement program at the end of 2025, the KATRIN experiment aims to probe keV-scale sterile neutrinos by analyzing the full tritium beta decay spectrum with a novel detector system, TRISTAN. Leveraging KATRIN's high source activity, this search is sensitive to mixing amplitudes at the parts-per-million level. However, extracting a potential sterile neutrino signature is challenging, as it relies on detailed modeling of the observed tritium spectrum and requires computationally intensive Monte Carlo simulations. To address this challenge, we implement neural simulation-based inference using normalizing flows to approximate the underlying probability density of the physics simulation. We demonstrate that continuous normalizing flows trained via conditional flow-matching enable modeling of experimental spectra and discuss the challenges involved.

Speaker: Luca Fallböhmer

09:50 → 10:10 Vertexing with ML for discovering ALPS (15'+5')

Speaker: Daniel Grewe

10:10 → 10:30 Characterizing the emergence of the complex molecular, dynamical molecular gas web in galaxies (15'+5')

Speaker: Andreas Burkert (LMU)

10:30 → 11:00 Coffee break

11:00 → 11:20 When MAGIC met IceCube: Gamma-Ray Astronomy with Neutrino Event Reconstruction Techniques (15'+5')

Speaker: Jarred Green (MPP)

When MAGIC met IceCube

11:20 → 11:40 Differentiable quantum Monte Carlo simulations for inference in Heavy Ion Collisions (15'+5')

Speaker: Tom Magorsch (TU Munich)

ODSL_days_magorsch.pdf

11:40 → 12:00 Likelihood-Free Conditional Inference for LEGEND-200 LAr Anti-Coincidence Cut (15'+5')

Speaker: Niko Nanda Putra Nila Lay (Technical University of Munich)

12:00 → 13:00 Lunch

13:00 → 13:20 Simulation-Based Inference for eROSITA Galaxy Cluster Cosmology (15'+5')

Abstract: We present a simulation-based inference (SBI) framework for cosmological parameter estimation from eROSITA galaxy cluster catalogs. Our approach combines a realistic forward-modeling pipeline with a set-based neural network and normalizing flows to leverage the full cluster-level information content. Using mock catalogs matching the size and selection properties of the eRASS1 sample, we demonstrate accurate and well-calibrated recovery of cosmological parameters in the presence of survey systematics. Despite the moderate sample size (~3,300 clusters), our method achieves constraints on Ωₘ and σ₈ comparable to traditional analyses based on significantly larger datasets. This highlights the potential of SBI methods for next-generation large-scale structure studies and the analysis of high-dimensional survey data.

https://arxiv.org/abs/2606.27439

Speaker: Silas Zelmer (MPE)

Zelmer_SBI.pptx

13:20 → 13:40 Simulation-based inference of galaxy clustering and population (15'+5')

Speaker: Silvan Fischbacher

13:40 → 14:00 Gradient estimators for parameter inference in discrete stochastic kinetic models (15'+5')

Speaker: Ludwig Burger

14:00 → 14:20 Coffee break

14:30 → 16:00 External event: Biermann lecture

14:30 A New Dawn of Science

Biermann Lecture by a pioneer of SBI / AI in astro/cosmo
More info: https://www.mpa-garching.mpg.de/1146339/biermann2026

Speaker: Benjamin Wandelt (Johns Hopkins University)

16:00 → 16:20 Parameter-Free Light Antinuclei Coalescence: Bridging Colliders and Cosmic Rays with Neural-Flow Surrogates (15'+5')

Speaker: Maximilian Korwieser (TUM)

FemtoCoal_ML_ODSL2_MK_080726_update.pdf

16:20 → 16:40 Why do we get old (15'+5')

Speaker: Onurcan Bektas

16:40 → 17:00 Closeout / discussion

17:00 → 19:00 Pizza social