We introduce a new, highly sensitive, and simple heterodyne optical method for imaging
individual nonfluorescent nanoclusters and nanocrystals. A 2 order of magnitude …

Gravitational deflection of starlight around the Sun during the 1919 total solar eclipse
provided measurements that confirmed Einstein's general theory of relativity. We have used …

The cosmological constant Λ affects gravitational lensing phenomena. The contribution of Λ
to the observable angular positions of multiple images and to their amplification and time …

The POINT-AGAPE collaboration is carrying out a search for gravitational microlensing
toward M 31 to reveal galactic dark matter in the form of MACHOs (Massive Astrophysical …

We present a suite of semianalytic disk-bulge-halo models for the Andromeda galaxy (M31)
that satisfy three fundamental conditions:(1) internal self-consistency,(2) consistency with …

We have carried out a survey of the Andromeda galaxy for unresolved microlensing (pixel
lensing). We present a subset of four short timescale, high signal-to-noise microlensing …

To assess how future progress in gravitational microlensing computation at high optical
depth will rely on both hardware and software solutions, we compare a direct inverse ray …

The light curve of PA-99-N2, one of the recently announced microlensing candidates toward
M31, shows small deviations from the standard Paczyński form. We explore a number of …

We present Cousins R and I band photometry of variable stars in a region in the disk of M 31
galaxy, obtained during 141 nights. Of the 26 Cepheid variables present in the region, two …

Pixel lensing is gravitational microlensing of unresolved stars. The main target explored up
to now has been the nearby galaxy of Andromeda, M31. The scientific issues of interest are …