Scale-dependent galaxy bias, CMB lensing-galaxy cross-correlation, and neutrino masses

被引：83

作者：

Giusarma, Elena ^{[1
,2
,3
]}

Vagnozzi, Sunny ^{[4
,5
]}

Ho, Shirley ^{[1
,2
,3
]}

Ferraro, Simone ^{[1
,2
,6
]}

Freese, Katherine ^{[4
,5
,7
]}

Kamen-Rubio, Rocky ^{[1
,8
]}

Luk, Kam-Biu ^{[1
,8
]}

机构：

[1] LBNL, Div Phys, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Berkeley Ctr Cosmol Phys, Berkeley, CA 94720 USA

[3] Carnegie Mellon Univ, Dept Phys, McWilliams Ctr Cosmol, Pittsburgh, PA 15213 USA

[4] Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, Oskar Klein Ctr Cosmoparticle Phys, Roslagstullbacken 21A, SE-10691 Stockholm, Sweden

[5] Nord Inst Theoret Phys NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden

[6] Univ Calif Berkeley, Miller Inst Basic Res Sci, Berkeley, CA 94720 USA

[7] Univ Michigan, Dept Phys, Leinweber Ctr Theoret Phys, Ann Arbor, MI 48109 USA

[8] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW D | 2018年 / 98卷 / 12期

基金：

瑞典研究理事会;

关键词：

MASSIVE NEUTRINOS; POWER-SPECTRUM; COSMOLOGICAL CONSTRAINTS; ACOUSTIC-OSCILLATIONS; HALO BIAS; SET; SIMULATIONS; TELESCOPE; GRAVITY; MODEL;

D O I：

10.1103/PhysRevD.98.123526

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

One of the most powerful cosmological data sets when it comes to constraining neutrino masses is represented by galaxy power spectrum measurements, P-gg(k). The constraining power of P-gg(k) is however severely limited by uncertainties in the modeling of the scale-dependent galaxy bias b(k). In this work we present a new proof-of-principle for a method to constrain b(k) by using the cross-correlation between the cosmic microwave background (CMB) lensing signal and galaxy maps (C-l(kappa g)) using a simple but theoretically well-motivated parametrization for b(k). We apply the method using C-l(kappa g) measured by cross-correlating Planck lensing maps and the Baryon Oscillation Spectroscopic Survey (BOSS) Data Release 11 (DR11) CMASS galaxy sample, and P-gg(k) measured from the BOSS DR12 CMASS sample. We detect a nonzero scale-dependence at moderate significance, which suggests that a proper modeling of b(k) is necessary in order to reduce the impact of nonlinearities and minimize the corresponding systematics. The accomplished increase in constraining power of P-gg(k) is demonstrated by determining a 95% confidence level upper bound on the sum of the three active neutrino masses M-nu of M-nu < 0.19 eV. This limit represents a significant improvement over previous bounds with comparable data sets. Our method will prove especially powerful and important as future large-scale structure surveys will overlap more significantly with the CMB lensing kernel providing a large cross-correlation signal.

引用

页数：10

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