The cluster abundance in cosmic string models for structure formation

• Tipo: Artigo em Revista Científica Internacional
• Data: 2000

Autores

Avelino, PP (Autor) FCUP; Wu, JHP (Autor) Outra; Shellard, EPS (Autor) Outra

Revista

Título: Monthly Notices of the Royal Astronomical Society

Vol. 318

Páginas: 329-332

ISSN: 0035-8711

Editora: Oxford University Press

Indexação

ISI Web of Knowledge - 3 Citações

Scopus - 3 Citações

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 4