GEODESIC INSTABILITY AND ISOTROPY OF CMWBR

被引:16
作者
ELLIS, G
TAVAKOL, R
机构
[1] SISSA,TRIESTE,ITALY
[2] UNIV CAPE TOWN,DEPT APPL MATH,CAPE TOWN,SOUTH AFRICA
关键词
D O I
10.1088/0264-9381/11/3/017
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We give a detailed study of the various aspects of the mixing effects due to geodesic instability in compact negative curvature FLRW models, as an explicit function of the cosmological parameters and the topological compactification scale. Our results show that the effect is: (i) much less pronounced than some of the claims made previously; (ii) strongly dependent upon the current value of the cosmological density parameter OMEGA0. Nevertheless it can, for reasonable values of the density parameter, produce appreciable mixing with a consequent reduction in the measured CMWBR anisotropy on a range of angular scales. This effect is expressible in terms of the curvature scalar and is therefore gauge invariant. Furthermore, we show: (a) the usual observer area distance routinely employed in cosmological studies also encodes all the dynamical information relating to the geodesic instability; (b) the estimates of the length scales on the surface of the last scattering depend significantly on the density parameter, and could be significantly different in low density universes compared with a critical density universe.
引用
收藏
页码:675 / 688
页数:14
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