The extended Baryon Oscillation Spectroscopic Survey: a cosmological forecast

DOI: 
10.1093/mnras/stw135
Publication date: 
01/04/2016
Main author: 
Zhao, Gong-Bo
IAA authors: 
Prada, Francisco
Authors: 
Zhao, Gong-Bo;Wang, Yuting;Ross, Ashley J.;Shandera, Sarah;Percival, Will J.;Dawson, Kyle S.;Kneib, Jean-Paul;Myers, Adam D.;Brownstein, Joel R.;Comparat, Johan;Delubac, Timothée;Gao, Pengyuan;Hojjati, Alireza;Koyama, Kazuya;McBride, Cameron K.;Meza, Andrés;Newman, Jeffrey A.;Palanque-Delabrouille, Nathalie;Pogosian, Levon;Prada, Francisco;Rossi, Graziano;Schneider, Donald P.;Seo, Hee-Jong;Tao, Charling;Wang, Dandan;Yèche, Christophe;Zhang, Hanyu;Zhang, Yuecheng;Zhou, Xu;Zhu, Fangzhou;Zou, Hu
Journal: 
Monthly Notices of the Royal Astronomical Society
Publication type: 
Article
Volume: 
457
Pages: 
2377-2390
Abstract: 
We present a science forecast for the extended Baryon Oscillation Spectroscopic Survey (eBOSS) survey. Focusing on discrete tracers, we forecast the expected accuracy of the baryonic acoustic oscillation (BAO), the redshift-space distortion (RSD) measurements, the f<SUB>NL</SUB> parameter quantifying the primordial non-Gaussianity, the dark energy and modified gravity parameters. We also use the line-of-sight clustering in the Lyman α forest to constrain the total neutrino mass. We find that eBOSS luminous red galaxies, emission line galaxies and clustering quasars can achieve a precision of 1, 2.2 and 1.6 per cent, respectively, for spherically averaged BAO distance measurements. Using the same samples, the constraint on fσ<SUB>8</SUB> is expected to be 2.5, 3.3 and 2.8 per cent, respectively. For primordial non-Gaussianity, eBOSS alone can reach an accuracy of σ(f<SUB>NL</SUB>) ̃ 10-15. eBOSS can at most improve the dark energy figure of merit by a factor of 3 for the Chevallier-Polarski-Linder parametrization, and can well constrain three eigenmodes for the general equation-of-state parameter. eBOSS can also significantly improve constraints on modified gravity parameters by providing the RSD information, which is highly complementary to constraints obtained from weak lensing measurements. A principal component analysis shows that eBOSS can measure the eigenmodes of the effective Newton's constant to 2 per cent precision; this is a factor of 10 improvement over that achievable without eBOSS. Finally, we derive the eBOSS constraint (combined with Planck, Dark Energy Survey and BOSS) on the total neutrino mass, σ(Σm<SUB>ν</SUB>) = 0.03 eV (68 per cent CL), which in principle makes it possible to distinguish between the two scenarios of neutrino mass hierarchies.
Database: 
ADS
WOK
SCOPUS
URL: 
https://ui.adsabs.harvard.edu/#abs/2016MNRAS.457.2377Z/abstract
ADS Bibcode: 
2016MNRAS.457.2377Z
Keywords: 
dark energy;large-scale structure of Universe;Astrophysics - Cosmology and Nongalactic Astrophysics