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BAO Modulation as a Probe of Compensated Isocurvature Perturbations · Around

2019

BAO Modulation as a Probe of Compensated Isocurvature Perturbations

Heinrich, Chen, Schmittfull, Marcel

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Compensated isocurvature perturbations (CIPs) are opposite spatial fluctuations in the baryon and dark matter density.

They can be generated for example in the curvaton model in the early Universe but are difficult to observe because their gravitational imprint nearly cancels.
We therefore propose a new measurement method by searching for a spatial modulation of the baryon acoustic oscillation (BAO) scale that CIPs induce.
We find that for a Euclid-like survey the sensitivity is marginally better than the WMAP cosmic microwave background (CMB) constraint, which exploits the CIP-induced modulation of the CMB sound horizon.

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