Universität Heidelberg

Nov 11, 2024 | academic.oup.com | Universität Heidelberg

We reanalyse the Pantheon+ supernova catalogue to compare a cosmology with non-FLRW evolution, the timescape cosmology, with the standard ΛCDM cosmology. To this end, we analyse the Pantheon+ for a geometric comparison between the two models. We construct a covariance matrix to be as independent of cosmology as possible, including independence from the FLRW geometry and peculiar velocity with respect to FLRW average evolution.

Nov 7, 2024 | academic.oup.com | Universität Heidelberg

Recent observations by the Event Horizon Telescope (EHT) of supermassive black holes M87* and Sgr A* offer valuable insights into their spacetime properties and astrophysical conditions. Utilizing a library of model images (∼2 million for Sgr A*) generated from general-relativistic magnetohydrodynamic (GRMHD) simulations, limited and coarse insights on key parameters such as black hole spin, magnetic flux, inclination angle, and electron temperature were gained.

Jun 7, 2024 | fis.tu-dresden.de | Mitsuhiro Matsuda |Henrik M. Hammarén |Jorge Lázaro |Universität Heidelberg

AbstractHuman embryonic development is generally slower compared with mouse, and one of the model systems for such inter-species differences in developmental tempo is the segmentation clock. The oscillation period of the human segmentation clock, as measured in induced presomitic mesoderm (iPSM) cells, is two times longer than that of mouse.

Sep 29, 2023 | link.aps.org | Jan Pawlowski |Universität Heidelberg |Julian Urban

Emerging sampling algorithms based on normalizing flows have the potential to solve ergodicity problems in lattice calculations. Furthermore, it has been noted that flows can be used to compute thermodynamic quantities which are difficult to access with traditional methods. This suggests that they are also applicable to the density-of-states approach to complex action problems.

Aug 25, 2023 | academic.oup.com | Universität Heidelberg |Max-Planck-Institut für Astronomie

Due to ram-pressure stripping, jellyfish galaxies are thought to lose large amounts, if not all, of their interstellar medium. Nevertheless, some, but not all, observations suggest that jellyfish galaxies exhibit enhanced star formation compared to control samples, even in their ram pressure-stripped tails.