Weak lensing forecasts for dark energy, neutrinos and initial conditions

I. Debono, A. Rassat, A. Réfrégier, A. Amara, T. D. Kitching, Thomas Kitching

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Weak gravitational lensing provides a sensitive probe of cosmology by measuring the mass distribution and the geometry of the low-redshift Universe. We show how an all-sky weak lensing tomographic survey can jointly constrain different sets of cosmological parameters describing dark energy, massive neutrinos (hot dark matter) and the primordial power spectrum. In order to put all sectors on an equal footing, we introduce a new parameter β, the second-order running spectral index. Using the Fisher matrix formalism with and without cosmic microwave background (CMB) priors, we examine how the constraints vary as the parameter set is enlarged. We find that weak lensing with CMB priors provides robust constraints on dark energy parameters and can simultaneously provide strong constraints on all three sectors. We find that the dark energy sector is largely insensitive to the inclusion of the other cosmological sectors. Implications for the planning of future surveys are discussed.
Original languageEnglish
Pages (from-to)110-119
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume404
Issue number1
DOIs
Publication statusPublished - 1 May 2010

Keywords / Materials (for Non-textual outputs)

  • gravitational lensing
  • cosmological parameters

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