1 code implementation • 17 Jul 2020 • Yuting Wang, Gong-Bo Zhao, Cheng Zhao, Oliver H. E. Philcox, Shadab Alam, Amélie Tamone, Arnaud de Mattia, Ashley J. Ross, Anand Raichoor, Etienne Burtin, Romain Paviot, Sylvain de la Torre, Will J. Percival, Kyle S. Dawson, Héctor Gil-Marín, Julian E. Bautista, Jiamin Hou, Kazuya Koyama, John A. Peacock, Vanina Ruhlmann-Kleider, Hélion du Mas des Bourboux, Johan Comparat, Stephanie Escoffier, Eva-Maria Mueller, Jeffrey A. Newman, Graziano Rossi, Arman Shafieloo, Donald P. Schneider

We perform a multi-tracer analysis using the complete Sloan Digital Sky Survey IV (SDSS-IV) extended Baryon Oscillation Spectroscopic Survey (eBOSS) DR16 luminous red galaxy (LRG) and the DR16 emission line galaxy (ELG) samples in the configuration space, and successfully detect a cross correlation between the two samples, and find the growth rate to be $f\sigma_8=0. 342 \pm 0. 085$ ($\sim25$ per cent accuracy) from the cross sample alone.

Cosmology and Nongalactic Astrophysics

1 code implementation • 17 Jul 2020 • Gong-Bo Zhao, Yuting Wang, Atsushi Taruya, Weibing Zhang, Hector Gil-Marin, Arnaud de Mattia, Ashley J. Ross, Anand Raichoor, Cheng Zhao, Will J. Percival, Shadab Alam, Julian E. Bautista, Etienne Burtin, Chia-Hsun Chuang, Kyle S. Dawson, Jean-Paul Kneib, Kazuya Koyama, Helion du Mas des Bourboux, Eva-Maria Mueller, Jeffrey A. Newman, John A. Peacock, Graziano Rossi, Vanina Ruhlmann-Kleider, Donald P. Schneider, Arman Shafieloo

We perform a joint BAO and RSD analysis using the eBOSS DR16 LRG and ELG samples in the redshift range of $z\in[0. 6, 1. 1]$, and detect a RSD signal from the cross power spectrum at a $\sim4\sigma$ confidence level, i. e., $f\sigma_8=0. 317\pm0. 080$ at $z_{\rm eff}=0. 77$.

Cosmology and Nongalactic Astrophysics

1 code implementation • 21 Apr 2020 • Andrius Tamosiunas, Hans A. Winther, Kazuya Koyama, David J. Bacon, Robert C. Nichol, Ben Mawdsley

Recent results show that GANs can be used as a fast, efficient and computationally cheap emulator for producing novel weak lensing convergence maps as well as cosmic web data in 2-D and 3-D.

Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics Computational Physics

1 code implementation • 2 Mar 2017 • Hans A. Winther, Kazuya Koyama, Marc Manera, Bill S. Wright, Gong-Bo Zhao

We present a general parallelized and easy-to-use code to perform numerical simulations of structure formation using the COLA (COmoving Lagrangian Acceleration) method for cosmological models that exhibit scale-dependent growth at the level of first and second order Lagrangian perturbation theory.

Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology

1 code implementation • 11 Jun 2014 • Guido W. Pettinari, Christian Fidler, Robert Crittenden, Kazuya Koyama, Antony Lewis, David Wands

We find that the presence of the intrinsic bispectrum will bias a measurement of primordial non-Gaussianity of local type by $f_{NL}^\text{bias}=0. 66$ for an ideal experiment with $\ell_\text{max}=3000$.

Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology

no code implementations • 14 Jan 2014 • Christian Fidler, Guido W. Pettinari, Martin Beneke, Robert Crittenden, Kazuya Koyama, David Wands

The intrinsic B-mode polarisation is present independent of the initial conditions and might contaminate the signal from primordial gravitational waves.

Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology

1 code implementation • 4 Feb 2013 • Guido W. Pettinari, Christian Fidler, Robert Crittenden, Kazuya Koyama, David Wands

We develop a new, efficient code for solving the second-order Einstein-Boltzmann equations, and use it to estimate the intrinsic CMB non-Gaussianity arising from the non-linear evolution of density perturbations.

Cosmology and Nongalactic Astrophysics High Energy Physics - Theory

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