Cosmic microwave background anisotropy from nonlinear structures in accelerating universes

Journal Article · Mon Sep 15 00:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.78.063510· OSTI ID:21250818

Sakai, Nobuyuki; Inoue, Kaiki Taro ^[1]

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1. Department of Education, Yamagata University, Yamagata 990-8560 (Japan)

We 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 quasilinear and large (> or approx.100 Mpc) voids/lumps would exist, they could be observed as cold or hot spots with temperature variance > or approx. 10{sup -5} K in the CMB sky.

• OSTI ID: 21250818
• Journal Information: Physical Review. D, Particles Fields, Vol. 78, Issue 6; Other Information: DOI: 10.1103/PhysRevD.78.063510; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
ANISOTROPY
APPROXIMATIONS
COSMIC DUST
COSMOLOGICAL CONSTANT
DISTANCE
DISTURBANCES
EINSTEIN FIELD EQUATIONS
GEODESICS
HOT SPOTS
MAXIMUM PERMISSIBLE CONCENTRATION
NONLINEAR PROBLEMS
NUMERICAL SOLUTION
PERTURBATION THEORY
PHOTONS
RED SHIFT
RELICT RADIATION
SIMULATION
SPACE-TIME
SPHERICAL CONFIGURATION
UNIVERSE