Galaxy surveys, inhomogeneous reionization, and dark energy

Abstract

We examine the effect of inhomogeneous reionization on the galaxy power spectrum and the consequences for probing dark energy. To model feedback during reionization, we apply an ansatz setting the galaxy overdensity proportional to the underlying ionization field. Thus, inhomogeneous reionization may leave an imprint in the galaxy power spectrum. We evolve this imprint to low redshift and use the Fisher-matrix formalism to assess the effect on parameter estimation. We show that a combination of low- (z=0.3) and high- (z=3) redshift galaxy surveys can constrain the size of cosmological HII regions during reionization. This imprint can also cause confusion when using baryon oscillations or other features of the galaxy power spectrum to probe the dark energy. We show that when bubbles are large, and hence detectable, our ability to constrain w can be degraded by up to 50%. When bubbles are small, the imprint has little or no effect on measuring dark-energy parameters.

arXiv comment9 pages, 8 figures, version accepted by MNRAS

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• Studying Reionization with Ly-alpha Emitters
• Evolution of the 21 cm signal throughout cosmic history
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• Large-scale BAO signatures of the smallest galaxies
• Cosmic Chronometers in the R_h=ct Universe
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• Cosmological HII Bubble Growth During Reionization
• Constraining massive neutrinos using cosmological 21 cm observations
• Constraining the expansion rate of the Universe using low-redshift ellipticals as cosmic chronometers
• Definitive Test of the R_h=ct Universe Using Redshift Drift
• The redshift-space galaxy two-point correlation function and baryon acoustic oscillations
• The Imprint of Cosmic Reionization on Galaxy Clustering
• A new scale in the bias expansion
• Estimates for the impact of Ultraviolet Background fluctuations on galaxy clustering measurements
• Impact of stellar population synthesis choices on forward modelling-based redshift distribution estimates
• Beyond the Standard Model of Physics with Astronomical Observations
• Evolving beyond z=0: insights about the future of stars and the intergalactic medium