Designing a space-based galaxy redshift survey to probe dark energy

Yun Wang, Will Percival, Andrea Cimatti, Pia Mukherjee, Luigi Guzzo, Carlton M. Baugh, Carmelita Carbone, Paolo Franzetti, Bianca Garilli, James E. Geach, Cedric G. Lacey, Elisabetta Majerotto, Alvaro Orsi, Piero Rosati, Lado Samushia, Giovanni Zamorani

Research output: Contribution to journalArticlepeer-review

75 Citations (Scopus)
25 Downloads (Pure)

Abstract

A space-based galaxy redshift survey would have enormous power in constraining dark energy and testing general relativity, provided that its parameters are suitably optimized. We study viable space-based galaxy redshift surveys, exploring the dependence of the Dark Energy Task Force (DETF) figure-of-merit (FoM) on redshift accuracy, redshift range, survey area, target selection and forecast method. Fitting formulae are provided for convenience. We also consider the dependence on the information used: the full galaxy power spectrum P(k), P(k) marginalized over its shape, or just the Baryon Acoustic Oscillations (BAO). We find that the inclusion of growth rate information (extracted using redshift space distortion and galaxy clustering amplitude measurements) leads to a factor of similar to 3 improvement in the FoM, assuming general relativity is not modified. This inclusion partially compensates for the loss of information when only the BAO are used to give geometrical constraints, rather than using the full P(k) as a standard ruler. We find that a space-based galaxy redshift survey covering similar to 20 000 deg(2) over 0.5 less than or similar to z less than or similar to 2 with sigma(z)/(1 + z)

Original languageEnglish
Pages (from-to)737-749
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume409
Issue number2
DOIs
Publication statusPublished - Dec 2010

Keywords

  • cosmology: observations
  • distance scale
  • large-scale structure of Universe
  • BARYON ACOUSTIC-OSCILLATIONS
  • COSMOLOGICAL CONSTANT
  • ACCELERATING UNIVERSE
  • COSMIC ACCELERATION
  • POWER-SPECTRUM
  • CONSTRAINTS
  • MATTER
  • SUPERNOVAE
  • GRAVITY
  • MODEL

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