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Probing the Origins of Voids in the Distribution of Galaxies

Published online by Cambridge University Press:  05 March 2013

Louise M. Ord ,
Martin Kunz ,
Hugues Mathis  and
Joseph Silk
Louise M. Ord*
Affiliation:
Department of Astrophysics & Optics, School of Physics, University of New South Wales, Sydney NSW 2052, Australia Astronomy Centre, University of Sussex, Brighton BN1 9QJ, UK
Martin Kunz
Affiliation:
Astronomy Centre, University of Sussex, Brighton BN1 9QJ, UK Theoretical Physics, University of Geneva, 1211 Geneva 4, Switzerland
Hugues Mathis
Affiliation:
Astrophysics, Denys Wilkinson Building, University of Oxford, Oxford OX1 3RH, UK
Joseph Silk
Affiliation:
Astrophysics, Denys Wilkinson Building, University of Oxford, Oxford OX1 3RH, UK
*
ECorresponding author. Email: louise@phys.unsw.edu.au
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Abstract

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If the voids that we see today in the distribution of galaxies existed at recombination, they will leave an imprint on the cosmic microwave background (CMB). On the other hand, if these voids formed much later, their effect on the CMB will be negligible and will not be observed with the current generation of experiments. In this paper, presented at the 2004 Annual Scientific Meeting of the Astronomical Society of Australia, we discuss our ongoing 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 CMB power on small scales detected by the Cosmic Background Imager (CBI) Deep Field. Here we present our improved method for predicting the effects of primordial voids on the CMB in which we treat a void 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 (Λ) 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 ΛCDM universe.

Keywords

cosmology: theorycosmic microwave backgroundlarge-scale structure of the universe
Type
ASA Conference 2004
Information
Publications of the Astronomical Society of Australia , Volume 22 , Issue 2 , 2005 , pp. 166 - 173
Copyright
Copyright © Astronomical Society of Australia 2005

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