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.

Scale-dependent galaxy bias, CMB lensing-galaxy cross-correlation, and neutrino masses / Giusarma, Elena; Vagnozzi, Sunny; Ho, Shirley; Ferraro, Simone; Freese, Katherine; Kamen-Rubio, Rocky; Luk, Kam-Biu. - In: PHYSICAL REVIEW D. - ISSN 2470-0029. - 98:12(2018), p. 123526. [10.1103/physrevd.98.123526]

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

Sunny Vagnozzi;
2018-01-01

Abstract

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.
2018
12
Giusarma, Elena; Vagnozzi, Sunny; Ho, Shirley; Ferraro, Simone; Freese, Katherine; Kamen-Rubio, Rocky; Luk, Kam-Biu
Scale-dependent galaxy bias, CMB lensing-galaxy cross-correlation, and neutrino masses / Giusarma, Elena; Vagnozzi, Sunny; Ho, Shirley; Ferraro, Simone; Freese, Katherine; Kamen-Rubio, Rocky; Luk, Kam-Biu. - In: PHYSICAL REVIEW D. - ISSN 2470-0029. - 98:12(2018), p. 123526. [10.1103/physrevd.98.123526]
File in questo prodotto:
File Dimensione Formato  
PhysRevD.98.123526.pdf

Solo gestori archivio

Tipologia: Versione editoriale (Publisher’s layout)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 426.51 kB
Formato Adobe PDF
426.51 kB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/360119
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 66
  • ???jsp.display-item.citation.isi??? 67
social impact