2 papers
astro-ph2000
The cosmological lens equation in a universe with non zero cosmological constant
M. Demianski, R. de Ritis, A. A. Marino +1
We derive and solve exactly the Dyer-Roeder equation in a Friedman-Robertson-Walker cosmological model with non zero cosmological constant. To take into account non homogeneous dis…
astro-ph1998
The inverse problem in microlensing: from the optical depth to the galaxy models parameters
V. F. Cardone, R. de Ritis, A. A. Marino
We present in this paper a simple method to obtain informations on galaxy models parameters using the measured value of the microlensing optical depth. Assuming a 100 percent MACHO…