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Relativistic matter bispectrum of cosmic structures on the light cone
Thomas Montandon, Julian Adamek, Oliver Hahn +4
Upcoming surveys of cosmic structures will probe scales close to the cosmological horizon, which opens up new opportunities for testing the cosmological concordance model to high a…
Renormalization group and UV completion of cosmological perturbations: Gravitational collapse as a critical phenomenon
Cornelius Rampf, Oliver Hahn
Cosmological perturbation theory is known to converge poorly for predicting the spherical collapse and void evolution of collisionless matter. Using the exact parametric solution a…
Exploring the effects of primordial non-Gaussianity at galactic scales
Clément Stahl, Thomas Montandon, Benoit Famaey +2
While large scale primordial non-Gaussianity is strongly constrained by present-day data, there are no such constraints at Mpc scales. Here we investigate the effect of significant…
Semantic Self-adaptation: Enhancing Generalization with a Single Sample
Sherwin Bahmani, Oliver Hahn, Eduard Zamfir +3
The lack of out-of-domain generalization is a critical weakness of deep networks for semantic segmentation. Previous studies relied on the assumption of a static model, i. e., once…
Eye of the Tyger: early-time resonances and singularities in the inviscid Burgers equation
Cornelius Rampf, Uriel Frisch, Oliver Hahn
We chart a singular landscape in the temporal domain of the inviscid Burgers equation in one space dimension for sine-wave initial conditions. These so far undetected complex singu…
Analytical growth functions for cosmic structures in a CDM Universe
Cornelius Rampf, Sonja Ornella Schobesberger, Oliver Hahn
The cosmological fluid equations describe the early gravitational dynamics of cold dark matter (CDM), exposed to a uniform component of dark energy, the cosmological constant .…