Theoretical uncertainty in baryon oscillations

Details Theoretical uncertainty in baryon oscillations Theoretical uncertainty in baryon oscillations

2004-07-27

arxiv.org/abs/astro-ph/0407539v1

Phys.Rev.D70:103523,2004

Astronomy and Astrophysics

Astrophysics

4 pages, REVTeX, 1 figure. Submitted to PRD

Scientific paper

10.1103/PhysRevD.70.103523

We discuss the systematic uncertainties in the recovery of dark energy properties from the use of baryon acoustic oscillations as a standard ruler. We demonstrate that while unknown relativistic components in the universe prior to recombination would alter the sound speed, the inferences for dark energy from low-redshift surveys are unchanged so long as the microwave background anisotropies can measure the redshift of matter-radiation equality, which they can do to sufficient accuracy. The mismeasurement of the radiation and matter densities themselves (as opposed to their ratio) would manifest as an incorrect prediction for the Hubble constant at low redshift. In addition, these anomalies do produce subtle but detectable features in the microwave anisotropies.

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