Cosmic Microwave Background Anisotropy from Nonlinear Structures in Accelerating Universes

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dc.creatorSakai, Nobuyuki
dc.creatorInoue, Kaiki Taro
dc.date2008-05-22
dc.date2008-09-11
dc.date.accessioned2026-07-07T12:43:51Z
dc.date.available2026-07-07T12:43:51Z
dc.descriptionWe study the cosmic microwave background (CMB) anisotropy due to spherically symmetric nonlinear structures in flat universes with dust and a cosmological constant. By modeling a time-evolving spherical compensated void/lump by Lemaitre-Tolman-Bondi spacetimes, we numerically solve the null geodesic equations with the Einstein equations. We find that a nonlinear void redshifts the CMB photons that pass through it regardless of the distance to it. In contrast, a nonlinear lump blueshifts (or redshifts) the CMB photons if it is located near (or sufficiently far from) us. The present analysis comprehensively covers previous works based on a thin-shell approximation and a linear/second order perturbation method and the effects of shell thickness and full nonlinearity. Our results indicate that, if quasi-linear and large ($>100$Mpc) voids/lumps would exist, they could be observed as cold or hot spots with temperature variance $>10^{-5}$K in the CMB sky.
dc.description7 pages, 4 figures, discussions on linear ISW effects added
dc.identifierhttps://arxiv.org/abs/0805.3446
dc.identifierhttp://arxiv.org/abs/0805.3446
dc.identifierPhys.Rev.D78:063510,2008
dc.identifierdoi:10.1103/PhysRevD.78.063510
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/220564
dc.subjectAstrophysics
dc.titleCosmic Microwave Background Anisotropy from Nonlinear Structures in Accelerating Universes
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