CONSTRAINTS ON BIG-BANG MODELS FROM STRUCTURE FORMATION

Authors
Citation
T. Padmanabhan, CONSTRAINTS ON BIG-BANG MODELS FROM STRUCTURE FORMATION, Journal of astrophysics and astronomy, 18(4), 1997, pp. 303-311
Citations number
13
Language
INGLESE
art.tipo
Article
ISSN journal
0250-6335
Volume
18
Issue
4
Year of publication
1997
Pages
303 - 311
Database
ISI
SICI code
0250-6335(1997)18:4<303:COBMFS>2.0.ZU;2-D
Abstract
I review the constraints on standard big bang model arising from consi derations related to structure formation. I will focus on two specific series of models though similar analysis can be performed for a wider class of models. The first one is a Ohm = 1 model with non-zero cosmo logical constant and the second one is a Ohm < 1 model with zero cosmo logical constant. The observational constraints which I shall discuss include the measurement of the Hubble's constant, the ages of globular clusters, the abundance of rich clusters, the baryon content of galax y clusters and the abundance of high redshift objects. These constrain ts limit the allowed range of the cosmological parameters and allow fo r only a small region to survive. In particular, the aesthetically ple asing model with Ohm = 1 and zero cosmological constant is ruled out b y the observations. It seems necessary to fine-tune the theoretical pa rameters if they have to fall within the available space. This talk is based on the work in Bagla et al. (1996).