%0 Journal Article
%T Dark energy and the accelerated expansion of the Universe
%A Waga Ioav
%J Brazilian Journal of Physics
%D 2000
%I Scientific Electronic Library Online
%X Recent observations indicate that the expansion of the Universe is accelerating. This suggests the existence of some kind of exotic matter with negative pressure. The simplest possibility is a cosmological constant but there are alternatives, as for instance an evolving scalar field. In this paper we explore constraints from lensing statistics and high-z type Ia Supernovae on some of these alternatives.
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332000000200018