Finite Cosmology and a CMB Cold Spot

Adler, R.J. ; /Stanford U., HEPL ; Bjorken, J.D. ; /SLAC ; Overduin, J.M. ; /Stanford U., HEPL

Stanford Linear Accelerator Center

关键词: Cosmological Models;    Dusts;    Geometry;    Universe Gravitation And Cosmology,Grqc;    Cosmology;   

DOI  :  10.2172/877967
RP-ID  :  SLAC-PUB-11778
RP-ID  :  AC02-76SF00515
RP-ID  :  877967

美国|英语

来源: UNT Digital Library

【 摘 要 】

The standard cosmological model posits a spatially flat universe of infinite extent. However, no observation, even in principle, could verify that the matter extends to infinity. In this work we model the universe as a finite spherical ball of dust and dark energy, and obtain a lower limit estimate of its mass and present size: the mass is at least 5 x 10{sup 23}M{sub {circle_dot}} and the present radius is at least 50 Gly. If we are not too far from the dust-ball edge we might expect to see a cold spot in the cosmic microwave background, and there might be suppression of the low multipoles in the angular power spectrum. Thus the model may be testable, at least in principle. We also obtain and discuss the geometry exterior to the dust ball; it is Schwarzschild-de Sitter with a naked singularity, and provides an interesting picture of cosmogenesis. Finally we briefly sketch how radiation and inflation eras may be incorporated into the model.