no code implementations • 17 Dec 2020 • Fabian Schmidt
A forward model of matter and biased tracers at arbitrary order in Lagrangian perturbation theory (LPT) is presented.
Cosmology and Nongalactic Astrophysics
no code implementations • 8 Jul 2020 • Nishant Agarwal, Vincent Desjacques, Donghui Jeong, Fabian Schmidt
We present a Fisher information study of the statistical impact of galaxy bias and selection effects on the estimation of key cosmological parameters from galaxy redshift surveys; in particular, the angular diameter distance, Hubble parameter, and linear growth rate at a given redshift, the cold dark matter density, and the tilt and running of the primordial power spectrum.
Selection bias Cosmology and Nongalactic Astrophysics
no code implementations • 6 Aug 2018 • Fabian Schmidt, Franz Elsner, Jens Jasche, Nhat Minh Nguyen, Guilhem Lavaux
We further show that the information captured by this likelihood is equivalent to the combination of the next-to-leading order galaxy power spectrum, leading-order bispectrum, and BAO reconstruction.
Cosmology and Nongalactic Astrophysics
no code implementations • 3 Nov 2015 • Titouan Lazeyras, Christian Wagner, Tobias Baldauf, Fabian Schmidt
We present accurate measurements of the linear, quadratic, and cubic local bias of dark matter halos, using curved "separate universe" N-body simulations which effectively incorporate an infinite-wavelength overdensity.
Cosmology and Nongalactic Astrophysics
no code implementations • 22 Sep 2014 • Christian Wagner, Fabian Schmidt, Chi-Ting Chiang, Eiichiro Komatsu
The large-scale statistics of observables such as the galaxy density are chiefly determined by their dependence on the local coarse-grained matter density.
Cosmology and Nongalactic Astrophysics