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

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 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.

arXiv commentMinor changes. Version accepted by Phys Rev D

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• A new interacting two fluid model and its consequences
• Probing the imprint of interacting dark energy on very large scales
• Distinguishing interacting dark energy from wCDM with CMB, lensing, and baryon acoustic oscillation data
• Prospects of probing quintessence with HI 21-cm intensity mapping survey
• Cosmic Degeneracies III: N-body Simulations of Interacting Dark Energy with Non-Gaussian Initial Conditions
• Qualitative probe of interacting dark energy with redshift-space distortions