Probing the origins of voids with the CMB

Ord, L M, Kunz, M, Mathis, H and Silk, J (2005) Probing the origins of voids with the CMB. ArXiv Astrophysics.

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In this talk presented at the 5th Rencontres du Vietnam 2004, we discuss our preliminary investigations into voids of primordial origin. We show that if voids in the cold dark matter distribution existed at the epoch of decoupling, they could contribute significantly to the apparent rise in cosmic microwave background (CMB) power on small scales detected by the Cosmic Background Imager (CBI) Deep Field. Here we present the preliminary results of our improved method for predicting the effects of primordial voids on the CMB in which we treat the voids as an external source in the cold dark matter (CDM) distribution, employing a Boltzmann solver. Our improved predictions include the effects of a cosmological constant (Lambda) and acoustic oscillations generated by voids at early times. We find that models with relatively large voids on the last scattering surface predict too much CMB power in an Einstein-de Sitter background cosmology but could be consistent with the current CMB observations in a Lambda CDM universe.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Martin Kunz
Date Deposited: 06 Feb 2012 18:27
Last Modified: 26 Jan 2018 11:59
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