Physics welcomes the idea that space contains energy whose gravitational effect approximates that of Einsteinâ€™s cosmological constant, L; today the concept is termed dark energy or quintessence.â€¦ (More)

Advances in theoretical ideas on how galaxies formed have not been strongly influenced by the advances in observations of what might be in the voids between the concentrations of ordinary opticallyâ€¦ (More)

In the Î›CDM cosmology, giant protogalaxies are present at redshift z = 6 with comoving number density (as a function of mass interior to âˆ¼ 10 kpc) that is comparable to the present number density ofâ€¦ (More)

Motivated in part by string theory, we consider the idea that the standard Î›CDM cosmological model might be modified by the effect of a long-range scalar dark matter interaction. The variant of thisâ€¦ (More)

We study the evolution of the bias factor b and the mass-galaxy correlation coefficient r in a simple analytic model for galaxy formation and the gravitational growth of clustering. The model showsâ€¦ (More)

We have a well-established standard model for cosmology and prospects for considerable additions from work in progress. I offer a list of elements of the standard model, comments on controversies inâ€¦ (More)

The simple reading of the evidence is that the large elliptical galaxies existed at about the present star mass and comoving number density at redshift z = 2. This is subject to the usualâ€¦ (More)

The relativistic hot Big Bang model for the expanding Universe has yielded a set of interpretations and successful predictions that substantially outnumber the elements used in devising the theory,â€¦ (More)

We discuss models for the cosmological dark sector in which the energy density of a scalar field approximates Einsteinâ€™s cosmological constant and the scalar field value determines the dark matterâ€¦ (More)