Hi, I'm Jonas!

Me

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Welcome to my personal webpage.

I’m a cosmologist/astrophysicist, currently as a postdoc at the University of Insubria in Como, Italy. Before that I was a PhD student at the University of Stavanger in Norway (supervised by Germano Nardini) and before that I studied at RWTH Aachen University in Germany.

Most of the time I’m a pretty chill dude and I enjoy all kinds of outdoor and extreme sports, such as hiking, climbing, skiing, surfing, skydiving, you name it. I also love to travel and explore new places, especially in the mountains.


Work-wise, what I’m doing can broadly be summarised as: I take slow-to-compute problems and make them fast. For this, I’m using machine learning and differentiable programming to speed up Bayesian inference for cosmology and gravitational wave detection. I also work on cosmological simulations and data analysis for Pulsar Timing Arrays (PTAs). I’m a member of the LISA Consortium, where I develop a simulation code to model the gravitational wave background from enhanced curvature perturbations arising during inflation and tools for accelerated Bayesian inference of astrophysical sources. I’m also a member of EAS and DPG.

Currently, I am working on three main topics:

  1. Machine learning for Bayesian Inference: I am developing GPry, a new method to perform Bayesian inference using Gaussian Process Regression and active sampling to create a surrogate model of the posterior function. This method is particularly useful for slow likelihoods, such as those for CMB (Planck) and astrophysical sources in LISA.
  2. Reconstructing Curvature Perturbations via SIGWs: As part of the LISA Cosmology Working Group, I am developing SIGWAY, a simulation code to model the gravitational wave background from enhanced curvature perturbations from inflation.
  3. Fast PTA inference: I recently started working on Pulsar Timing Array (PTA) data analysis as part of EPTA, where I am trying to speed up Bayesian inference for PTAs using the jax-enabled PTA likelihood from Discovery.

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