Correlated perturbations from inflation and the cosmic microwave background

被引：101
|
作者：
Amendola, L
Gordon, C
Wands, D
Sasaki, M
机构：
[1] Osserv Astron Roma, I-00040 Rome, Italy
[2] Univ Cambridge, Ctr Math Sci, Dept Appl Math & Theoret Phys, Cambridge CB3 0WA, England
[3] Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 2EG, Hants, England
[4] Osaka Univ, Grad Sch Sci, Dept Earth & Space Sci, Toyonaka, Osaka 5600043, Japan
来源：
PHYSICAL REVIEW LETTERS | 2002年 / 88卷 / 21期
关键词：
D O I：
10.1103/PhysRevLett.88.211302
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We compare the latest cosmic microwave background data with theoretical predictions including correlated adiabatic and cold dark matter (CDM) isocurvature perturbations with a simple power-law dependence. We find that there is a degeneracy between the amplitude of correlated isocurvature perturbations and the spectral tilt. A negative (red) tilt is found to be compatible with a larger isocurvature contribution. Estimates of the baryon and CDM densities are found to be almost independent of the isocurvature amplitude. The main result is that current microwave background data do not exclude a dominant contribution from CDM isocurvature fluctuations on large scales.
引用
收藏
页码：2113021 / 2113024
页数：4
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