We present new determinations of the cosmic expansion history from red-envelope galaxies.
We have obtained for this purpose high-quality spectra with the Keck-LRIS spectrograph of …

We propose to use relative galaxy ages as a means of constraining cosmological
parameters. By measuring the age difference between two ensembles of passively evolving …

We place constraints on the redshift-averaged, effective value of the equation of state of dark
energy, w, using only the absolute ages of Galactic stars and the observed position of the …

We use a series of cosmological N-body simulations for a flat Λ cold dark matter (ΛCDM)
cosmology to investigate the structural properties of dark matter haloes, at redshift zero, in …

Context. Studies of low surface brightness (LSB) galaxies in nearby clusters have revealed a
sub-population of extremely diffuse galaxies with central surface brightness of μ 0, g′> 24 …

The chemical and spectrophotometric evolution of spiral galaxies is investigated with
detailed models, making use of up-to-date ingredients (like metallicity-dependent stellar …

ABSTRACT We calculate the Type Ia supernova (SN) rate for different star formation
histories in galaxies by adopting the most popular and recent progenitor models. We show …

From recent CMB and Large Scale Structure observations the value of the equation of state
of dark energy, assuming it to be constant in time, is constrained to be− 1.3< w<− 0.7 at the …

We use numerical simulations of structure formation in a cold dark matter cosmology to
compare the angular momentum distributions of dark matter and nonradiative gas in a large …

We explore the redshift evolution of the metal content of damped Ly α systems (DLAs) with
new observations of four absorbers at z< 1.5; together with other recently published data …