Zobrazeno 1 - 10
of 452
pro vyhledávání: '"Refregier, Alexandre"'
By means of N-body simulations, we study early structure formation in the presence of a scaling distribution of cosmic string loops. Cosmic string loops dominate the high redshift halo mass function while the fluctuations seeded by the standard struc
Externí odkaz:
http://arxiv.org/abs/2402.06235
Autor:
Moser, Beatrice, Kacprzak, Tomasz, Fischbacher, Silvan, Refregier, Alexandre, Grimm, Dominic, Tortorelli, Luca
Publikováno v:
JCAP05(2024)049
Accurate redshift calibration is required to obtain unbiased cosmological information from large-scale galaxy surveys. In a forward modelling approach, the redshift distribution n(z) of a galaxy sample is measured using a parametric galaxy population
Externí odkaz:
http://arxiv.org/abs/2401.06846
Autor:
Berner, Pascale, Refregier, Alexandre, Moser, Beatrice, Tortorelli, Luca, Valle, Luis Fernando Machado Poletti, Kacprzak, Tomasz
A forward modelling approach provides simple, fast and realistic simulations of galaxy surveys, without a complex underlying model. For this purpose, galaxy clustering needs to be simulated accurately, both for the usage of clustering as its own prob
Externí odkaz:
http://arxiv.org/abs/2310.15223
Autor:
Reeves, Alexander, Nicola, Andrina, Refregier, Alexandre, Kacprzak, Tomasz, Valle, Luis Fernando Machado Poletti
With the rapid advance of wide-field surveys it is increasingly important to perform combined cosmological probe analyses. We present a new pipeline for simulation-based multi-probe analyses, which combines tomographic large-scale structure (LSS) pro
Externí odkaz:
http://arxiv.org/abs/2309.03258
Cosmic strings, if they exist, source nonlinear and non-Gaussian perturbations all the way back to the time of equal matter and radiation (and earlier). Here, we compute the mass function of halos seeded by a scaling distribution of cosmic string loo
Externí odkaz:
http://arxiv.org/abs/2304.06429
Autor:
Anagnostidis, Sotiris, Thomsen, Arne, Kacprzak, Tomasz, Tröster, Tilman, Biggio, Luca, Refregier, Alexandre, Hofmann, Thomas
In recent years, deep learning approaches have achieved state-of-the-art results in the analysis of point cloud data. In cosmology, galaxy redshift surveys resemble such a permutation invariant collection of positions in space. These surveys have so
Externí odkaz:
http://arxiv.org/abs/2211.12346
We present CosmoGridV1: a large set of lightcone simulations for map-level cosmological inference with probes of large scale structure. It is designed for cosmological parameter measurement based on Stage-III photometric surveys with non-Gaussian sta
Externí odkaz:
http://arxiv.org/abs/2209.04662
Autor:
Kuhn, Emily R., Saliwanchik, Benjamin R. B., Bandura, Kevin, Bianco, Michele, Chiang, H. Cynthia, Crichton, Devin, Deng, Meiling, Gaddam, Sindhu, Gerodias, Kit, Gumba, Austin, Harris, Maile, Moodley, Kavilan, Mugundhan, V., Newburgh, Laura, Peterson, Jeffrey, Pieters, Elizabeth, Polish, Anna R., Refregier, Alexandre, Sampath, Ajith, Santos, Mario G., Sengate, Onkabetse, Sievers, Jonathan, Smith, Ema, Tyndall, Will, Walters, Anthony, Weltman, Amanda, Wulf, Dallas
The Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) aims to improve constraints on the dark energy equation of state through measurements of large-scale structure at high redshift ($0.8
Externí odkaz:
http://arxiv.org/abs/2207.12461
Autor:
Tan, Ting, Zuercher, Dominik, Fluri, Janis, Refregier, Alexandre, Tarsitano, Federica, Kacprzak, Tomasz
$ $Weak gravitational lensing is a powerful probe which is used to constrain the standard cosmological model and its extensions. With the enhanced statistical precision of current and upcoming surveys, high accuracy predictions for weak lensing stati
Externí odkaz:
http://arxiv.org/abs/2207.03598
Publikováno v:
JCAP01(2023)033
Intrinsic alignment (IA) modelling and photometric redshift estimation are two of the main sources of systematic uncertainty in weak lensing surveys. We investigate the impact of redshift errors and their interplay with different IA models. Generally
Externí odkaz:
http://arxiv.org/abs/2207.01627