ar X iv : a st ro - p h / 01 01 36 9 v 3 2 3 N ov 2 00 1 Large scale geometry and evolution of a universe with radiation pressure and cosmological constant

ar X iv : a st ro - p h / 01 01 36 9 v 2 2 5 Ja n 20 01 Large scale geometry and evolution of a universe with radiation pressure and cosmological constant

In view of new experimental results that strongly suggest a non-zero cosmological constant, it becomes interesting to revisit the Friedman-Lemâıtre model of evolution of a universe with cosmological constant and radiation pressure. In this paper, we discuss the explicit solutions for that model, and perform numerical explorations for reasonable values of cosmological parameters. We also analyse...

ar X iv : a st ro - p h / 01 10 21 1 v 1 9 O ct 2 00 1 Quintessence – the Dark Energy in the Universe ?

Quintessence – the energy density of a slowly evolving scalar field – may constitute a dynamical form of the homogeneous dark energy in the universe. We review the basic idea and indicate observational tests which may distinguish quintessence from a cosmological constant.

ar X iv : a st ro - p h / 01 11 13 6 v 1 7 N ov 2 00 1 1 Active Optics in Modern , Large Optical Telescopes

ar X iv : a st ro - p h / 03 01 01 2 v 2 9 J an 2 00 3 The State of the Universe : Cosmological Parameters 2002 ⋆

In the past decade, observational cosmology has had one of the most exciting periods in the past century. The precision with which we have been able to measure cosmological parameters has increased tremendously, while at the same time, we have been surprised beyond our wildest dreams by the results. I review here recent measurements of the expansion rate, geometry, age , matter content, and equ...

ar X iv : a st ro - p h / 03 01 01 2 v 1 1 J an 2 00 3 The State of the Universe : Cosmological Parameters 2002 ⋆

In the past decade, observational cosmology has had one of the most exciting periods in the past century. The precision with which we have been able to measure cosmological parameters has increased tremendously, while at the same time, we have been surprised beyond our wildest dreams by the results. I review here recent measurements of the expansion rate, geometry, age , matter content, and equ...