Local Voids as the Origin of Large-angle Cosmic Microwave Background Anomalies: The Effect of a Cosmological Constant

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dc.creatorInoue, Kaiki Taro
dc.creatorSilk, Joseph
dc.date2006-12-13
dc.date2007-05-20
dc.date.accessioned2026-07-07T11:00:28Z
dc.date.available2026-07-07T11:00:28Z
dc.descriptionWe explore the large angular scale temperature anisotropies in the cosmic microwave background (CMB) due to homogeneous local dust-filled voids in a flat Friedmann-Robertson-Walker universe with a cosmological constant. In comparison with the equivalent dust-filled void model in the Einstein-de Sitter background, we find that the anisotropy for compensated asymptotically expanding local voids can be larger because second-order effects enhance the linear integrated Sachs-Wolfe (ISW) effect. However, for local voids that expand sufficiently faster than the asymptotic velocity of the wall, the second-order effect can suppress the fluctuation due to the linear ISW effect. A pair of quasi-linear compensated asymptotic local voids with radius (2-3)*10^2 ~h^{-1} Mpc and a matter density contrast ~-0.3 can be observed as cold spots with a temperature anisotropy Delta T/T~O(10^{-5}) that might help explain the observed large-angle CMB anomalies. We predict that the associated anisotropy in the local Hubble constant in the direction of the voids could be as large as a few percent.
dc.description23 pages, 5 figures, version accepted for publication in ApJ with minor revision
dc.identifierhttps://arxiv.org/abs/astro-ph/0612347
dc.identifierhttp://arxiv.org/abs/astro-ph/0612347
dc.identifierAstrophys.J.664:650-659,2007
dc.identifierdoi:10.1086/517603
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187684
dc.subjectAstrophysics
dc.titleLocal Voids as the Origin of Large-angle Cosmic Microwave Background Anomalies: The Effect of a Cosmological Constant
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