Search Results for author: B. Joachimi

Found 6 papers, 2 papers with code

When tension is just a fluctuation: How noisy data affect model comparison

no code implementations18 Feb 2021 B. Joachimi, F. Köhlinger, W. Handley, P. Lemos

Summary statistics of the likelihood, such as the Bayesian evidence, offer a principled way of comparing models and assessing tension between, or within, the results of physical experiments.

Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics

Self-calibration and robust propagation of photometric redshift distribution uncertainties in weak gravitational lensing

no code implementations14 Dec 2020 B. Stölzner, B. Joachimi, A. Korn, H. Hildebrandt, A. H. Wright

We fit this model to pre-calibrated redshift distributions and implement an analytic marginalisation over the potentially several hundred redshift nuisance parameters in the weak lensing likelihood, which is demonstrated to accurately recover the cosmological posterior.

Cosmology and Nongalactic Astrophysics

The PAU Survey: Photometric redshifts using transfer learning from simulations

no code implementations16 Apr 2020 M. Eriksen, A. Alarcon, L. Cabayol, J. Carretero, R. Casas, F. J. Castander, J. De Vicente, E. Fernandez, J. Garcia-Bellido, E. Gaztanaga, H. Hildebrandt, H. Hoekstra, B. Joachimi, R. Miquel, C. Padilla, E. Sanchez, I. Sevilla-Noarbe, P. Tallada

In this paper we introduce the \textsc{Deepz} deep learning photometric redshift (photo-$z$) code.

Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics

KiDS+VIKING-450 and DES-Y1 combined: Cosmology with cosmic shear

1 code implementation21 Jun 2019 S. Joudaki, H. Hildebrandt, D. Traykova, N. E. Chisari, C. Heymans, A. Kannawadi, K. Kuijken, A. H. Wright, M. Asgari, T. Erben, H. Hoekstra, B. Joachimi, L. Miller, T. Tröster, J. L. van den Busch

We present a combined tomographic weak gravitational lensing analysis of the Kilo Degree Survey (KV450) and the Dark Energy Survey (DES-Y1).

Cosmology and Nongalactic Astrophysics

Constraints on intrinsic alignment contamination of weak lensing surveys using the MegaZ-LRG sample

2 code implementations20 Aug 2010 B. Joachimi, R. Mandelbaum, F. B. Abdalla, S. L. Bridle

For r_p > 6 Mpc/h, the fits to galaxy position-shape correlation functions are consistent with the scaling with r_p and redshift of a revised, nonlinear version of the linear alignment model for all samples.

Cosmology and Nongalactic Astrophysics

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