Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.mrao.cam.ac.uk/~anthony/latex/Shellard.ps Дата изменения: Sat Jun 24 21:03:16 2000 Дата индексирования: Tue Oct 2 03:33:04 2012 Кодировка: Поисковые слова: star

Cosmic defects and causal theories
E.P.S. Shellard
DAMTP, University of Cambridge
Topological defects are a class of models within a `causal'
paradigm for large-scale structure formation; they provide an al-
ternative against which to test the relative successes of in ation.
Recent CMB results showing the position of a strong primary
Doppler peak place cosmic defects under severe observational pres-
sure. Other specic signatures which can be used to distinguish
causal models from in ation will also be discussed, including non-
gaussianity, vector modes and polarisation-temperature correla-
tions. Quantitative observational predictions for cosmic strings
will be presented, emphasising small-angle CMB anisotropy. Fi-
nally, we discuss constraints on hybrid models in which both de-
fects and in ation produce perturbations.
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