The cluster abundance in cosmic string models for structure formation

• Type: Article in International Scientific Journal
• Date: 2000

Authors

Avelino, PP (Author) FCUP; Wu, JHP (Author) Other; Shellard, EPS (Author) Other

Journal

Title: Monthly Notices of the Royal Astronomical Society

Vol. 318

Pages: 329-332

ISSN: 0035-8711

Publisher: Oxford University Press

Indexing

ISI Web of Knowledge - 3 Citations

Scopus - 3 Citations

Other information

Authenticus ID: P-000-YQ8

DOI: 10.1046/j.1365-8711.2000.03556.x

Abstract (EN): We use the present observed number density of large X-ray clusters to constrain the amplitude of matter density perturbations induced by cosmic strings on the scale of 8h(-1)Mpc (sigma (8)), in both open cosmologies and flat models with a non-zero cosmological constant. We find a slightly lower value of sigma (8) than that obtained in the context of primordial Gaussian fluctuations generated during inflation. This lower normalization of sigma (8) results from the mild non-Gaussianity on cluster scales, where the one-point probability distribution function is well approximated by a chi (2) distribution and thus has a longer tail than a Gaussian distribution. We also show that sigma (8) normalized using cluster abundance is consistent with the COBE normalization.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4