[Show abstract][Hide abstract] ABSTRACT: In the frame of the call for proposal for the E-ELT instrumentation studies, the CODEX team carried out the feasibility study
for a spectrograph for extremely stable Doppler measurements. The CODEX project and its scientific goals are described in
[L. Pasquini, S. Cristiani et al. in Messenger 122, 10 (2005)]. During the development of this study, the CODEX team recognized that a CODEX-like instrument would be of high scientific
interest also on the VLT. The ESPRESSO concept was born. The contribution by J. Liske in this volume highlights the direct
links between the two instruments (see also [J. Liske, A. Grazian, E. Vanzella et al. in 2008MNRAS.tmp..460L, in press]).
[Show abstract][Hide abstract] ABSTRACT: CODEX and ESPRESSO are concepts for ultra-stable, high-resolution spectrographs at the E-ELT and VLT, respectively. Both instruments
are well motivated by distinct sets of science drivers. However, ESPRESSO will also be a stepping stone towards CODEX both
in a scientific as well as in a technical sense. Here we discuss this role of ESPRESSO with respect to one of the most exciting
CODEX science cases, i.e. the dynamical determination of the cosmic expansion history.
[Show abstract][Hide abstract] ABSTRACT: CODEX, a high resolution, super-stable spectrograph to be fed by the E-ELT, the most powerful telescope ever conceived, will for the first time provide the possibility of directly measuring the change of the expansion rate of the Universe with time and much more, from the variability of fundamental constants to the search for other earths. A study for the implementation at the VLT of a precursor of CODEX, dubbed ESPRESSO, is presently carried out by a collaboration including ESO, IAC, INAF, IoA Cambridge and Observatoire de Geneve. The present talk is focused on the cosmological aspects of the experiment. Comment: 6 pages Latex, to appear in the proceedings of `A Century of Cosmology', S. Servolo, August 2007, to be published in Il Nuovo Cimento
Full-text · Article · Dec 2007 · Nuovo Cimento- Societa Italiana di Fisica Sezione B