Zobrazeno 1 - 10
of 219
pro vyhledávání: '"Jasche, Jens"'
$\texttt{PineTree}$: A generative, fast, and differentiable halo model for wide-field galaxy surveys
Mock halo catalogues are indispensable data products for developing and validating cosmological inference pipelines. A major challenge in generating mock catalogues is modelling the halo or galaxy bias, which is the mapping from matter density to dar
Externí odkaz:
http://arxiv.org/abs/2407.01391
Autor:
Wempe, Ewoud, Lavaux, Guilhem, White, Simon D. M., Helmi, Amina, Jasche, Jens, Stopyra, Stephen
We present a novel approach based on Bayesian field-level inference capable of resolving individual galaxies within the Local Group (LG), enabling detailed studies of its structure and formation via posterior simulations. We extend the Bayesian Origi
Externí odkaz:
http://arxiv.org/abs/2406.02228
Autor:
Doeser, Ludvig, Jamieson, Drew, Stopyra, Stephen, Lavaux, Guilhem, Leclercq, Florent, Jasche, Jens
Analysing next-generation cosmological data requires balancing accurate modeling of non-linear gravitational structure formation and computational demands. We propose a solution by introducing a machine learning-based field-level emulator, within the
Externí odkaz:
http://arxiv.org/abs/2312.09271
We construct an anti-halo void catalogue of $150$ voids with radii $R > 10\,h^{-1}\mathrm{\,Mpc}$ in the Local Super-Volume ($<135\,h^{-1}\mathrm{\,Mpc}$ from the Milky Way), using posterior resimulation of initial conditions inferred by field-level
Externí odkaz:
http://arxiv.org/abs/2311.12926
Galaxies of different types are not equally distributed in the Local Universe. In particular, the supergalactic plane is prominent among the brightest ellipticals, but inconspicuous among the brightest disk galaxies. This striking difference provides
Externí odkaz:
http://arxiv.org/abs/2311.00755
Autor:
Elbers, Willem, Frenk, Carlos S., Jenkins, Adrian, Li, Baojiu, Pascoli, Silvia, Jasche, Jens, Lavaux, Guilhem, Springel, Volker
The Cosmic Neutrino Background (CNB) encodes a wealth of information, but has not yet been observed directly. To determine the prospects of detection and to study its information content, we reconstruct the phase-space distribution of local relic neu
Externí odkaz:
http://arxiv.org/abs/2307.03191
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 527, Issue 1, January 2024, Pages 1244-1256
We investigate the accuracy requirements for field-level inference of cluster and void masses using data from galaxy surveys. We introduce a two-step framework that takes advantage of the fact that cluster masses are determined by flows on larger sca
Externí odkaz:
http://arxiv.org/abs/2304.09193
Normalizing Flows (NF) are Generative models which are particularly robust and allow for exact sampling of the learned distribution. They however require the design of an invertible mapping, whose Jacobian determinant has to be computable. Recently i
Externí odkaz:
http://arxiv.org/abs/2302.01955
The large-scale structure is a major source of cosmological information. However, next-generation photometric galaxy surveys will only provide a distorted view of cosmic structures due to large redshift uncertainties. To address the need for accurate
Externí odkaz:
http://arxiv.org/abs/2301.03581
Publikováno v:
Phys. Rev. D 106, 103526 (2022)
Decaying or annihilating dark matter particles could be detected through gamma-ray emission from the species they decay or annihilate into. This is usually done by modelling the flux from specific dark matter-rich objects such as the Milky Way halo,
Externí odkaz:
http://arxiv.org/abs/2205.12916