Degeneracy between primordial non-Gaussianity and interaction in the dark sector

Mahmoud Hashim, Daniele Bertacca, Roy Maartens

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Abstract

If dark energy and dark matter interact via exchange of energy and momentum, then this may affect the galaxy power spectrum on large scales. When this happens, it may be degenerate with the signal from primordial non-Gaussianity via a scale-dependent bias. We consider a class of interacting dark energy models and show that the matter overdensity is scale dependent on large scales. We estimate the effective non-Gaussianity arising from the large-scale effects of interaction in the dark sector. The signal of dark sector interaction can be disentangled from a primordial non-Gaussian signal by measuring the power at two redshifts.

Original languageEnglish
Article number103518
Pages (from-to)103518
JournalPhysical Review D
Volume90
Issue number10
DOIs
Publication statusPublished - 13 Nov 2014

Keywords

  • RCUK
  • STFC
  • ST/K0090X/1

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