A Caltech Library Service

Forecasting cosmological constraints from the weak lensing magnification of type Ia supernovae measured by the Nancy Grace Roman Space Telescope

Zhai, Zhongxu and Wang, Yun and Scolnic, Dan (2020) Forecasting cosmological constraints from the weak lensing magnification of type Ia supernovae measured by the Nancy Grace Roman Space Telescope. Physical Review D, 102 (12). Art. No. 123513. ISSN 2470-0010. doi:10.1103/PhysRevD.102.123513.

[img] PDF - Published Version
See Usage Policy.

[img] PDF - Submitted Version
See Usage Policy.


Use this Persistent URL to link to this item:


The weak lensing magnification of type Ia supernovae (SNe Ia) is sensitive to the clustering of matter and provides an independent cosmological probe complementary to SN Ia distance measurements. The Nancy Grace Roman Space Telescope is uniquely sensitive to this measurement as it can discover high redshift SNe Ia and measure them with high precision. We present a methodology for reconstructing the probability distribution of the weak lensing magnification μ of SNe Ia, p(μ), from observational data, and using it to constrain cosmological parameters. We find that the reconstructed p(μ) can be fitted accurately by a stretched Gaussian distribution and used to measure the variance of μ, ξ_μ, which can be compared to theoretical predictions in a likelihood analysis. Applying our methodology to a set of realistically simulated SNe Ia expected from the Roman Space Telescope, we find that using the weak lensing magnification of the SNe Ia constrains a combination of matter density Ω_m and matter clustering amplitude σ₈. SN Ia distances alone lead to a better than 1% measurement of Ω_m. The combination of SN Ia weak lensing magnification and distance measurements result in a ∼10% measurement on σ₈. The SNe Ia from Roman will be powerful in constraining the cosmological model.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Zhai, Zhongxu0000-0001-7984-5476
Scolnic, Dan0000-0002-4934-5849
Additional Information:© 2020 American Physical Society. Received 15 August 2020; accepted 10 November 2020; published 3 December 2020. This work was supported in part by NASA Grant No. 15-WFIRST15-0008 Cosmology with the High Latitude Survey Roman Science Investigation Team (SIT). D. S. is supported in part by NASA under Contract No. NNG17PX03C issued through the Roman Science Investigation Teams Programme. D. S. is also supported by DOE Grant No. DE-SC0010007 and the David and Lucile Packard Foundation.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0010007
David and Lucile Packard FoundationUNSPECIFIED
Issue or Number:12
Record Number:CaltechAUTHORS:20200908-150409494
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105274
Deposited By: Tony Diaz
Deposited On:08 Sep 2020 23:43
Last Modified:16 Nov 2021 18:41

Repository Staff Only: item control page