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astro-ph2003
Approximate angular diameter distance in a locally inhomogeneous universe with nonzero cosmological constant
M. Demianski, R. de Ritis, A. A. Marino +1
We discuss the general and approximate angular diameter distance in the Friedman-Robertson-Walker cosmological models with nonzero cosmological constant. We modify the equation for…
astro-ph1999
Constraints on the slope of the dark halo mass function by microlensing observables
V. F. Cardone, R. de Ritis, A. A. Marino
We investigate the dark halo lens mass function (MF) for a wide class of spheroidal non singular isothermal models comparing observed and observable microlensing quantities for MAC…
astro-ph1999
Detecting planets around stars in nearby galaxies
G. Covone, R. de Ritis, M. Dominik +1
The only way to detect planets around stars at distances of several kpc is by (photometric or astrometric) microlensing observations. In this paper, we show that the capability of…