Cosmic inventory of energy densities: issues and concerns

Details Cosmic inventory of energy densities: issues and concerns Cosmic inventory of energy densities: issues and concerns

2001-12-26

arxiv.org/abs/gr-qc/0112068v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Based on the invited talk at the XIII Rencontres de Blois - Frontiers of the Universe, June 17-23,2001

Scientific paper

The dynamics of our universe is characterised by the density parameters for cosmological constant ($\Omega_V$), nonbaryonic darkmatter($\Omega_{\rm wimp}$), radiation ($\Omega_R$) and baryons ($\Omega_B$). To these parameters -- which describe the smooth background universe -- one needs to add at least another dimensionless number ($\sim 10^{-5}$) characterising the strength of primordial fluctuations in the gravitational potential, in order to ensure formation of structures by gravitational instability. I discuss several issues related to the description of the universe in terms of these numbers and argue that we do not yet have a fundamental understanding of these issues.

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