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

Journal Article · · Physical Review. D.
 [1];  [2];  [3]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States); OSTI
  2. California Institute of Technology (CalTech), Pasadena, CA (United States)
  3. Duke Univ., Durham, NC (United States)
+ Show Author Affiliations
We report that 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, ξμ, 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 Ωm and matter clustering amplitude σ8. SN Ia distances alone lead to a better than 1% measurement of Ωm. 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.
Research Organization:
California Institute of Technology (CalTech), Pasadena, CA (United States); Duke Univ., Durham, NC (United States)
Sponsoring Organization:
David and Lucile Packard Foundation; National Aeronautics and Space Administration (NASA); USDOE Office of Science (SC)
Grant/Contract Number:
SC0010007
OSTI ID:
1851270
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 12 Vol. 102; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
79 ASTRONOMY AND ASTROPHYSICS
cosmological parameters
cosmology