Einstein's legacy in galaxy surveys

Stefano Camera*, Roy Maartens, Mário G. Santos

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Non-Gaussianity in the primordial fluctuations that seeded structure formation produces a signal in the galaxy power spectrum on very large scales. This signal contains vital information about the primordial Universe, but it is very challenging to extract, because of cosmic variance and large-scale systematics-especially after the Planck experiment has already ruled out a large amplitude for the signal. Whilst cosmic variance and experimental systematics can be alleviated by the multitracer method, we here address another systematic-introduced by not using the correct relativistic analysis of the power spectrum on very large scales. In order to reduce the errors on f<inf>NL</inf>, we need to include measurements on the largest possible scales. Failure to include the relativistic effects on these scales can introduce significant bias in the best-fit value of f<inf>NL</inf> from future galaxy surveys.

Original languageEnglish
Pages (from-to)L80-L84
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume451
Issue number1
Early online date10 Jun 2015
DOIs
Publication statusPublished - 21 Jul 2015

Keywords

  • Cosmological parameters
  • Cosmology
  • Early universe
  • Galaxies
  • Large-scale structure of the universe
  • Observations
  • Radio lines
  • Relativistic processes
  • RCUK
  • STFC
  • ST/K0090X/1

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