Limiting the Abundance of LIGO/Virgo Black Holes with Microlensing Observations of Quasars of Finite Size
We present a simple but general argument that strongly limits the abundance of primordial black holes (PBHs) (or other unknown population of compact objects)...
Limits on the Mass and Abundance of Primordial Black Holes from Quasar Gravitational Microlensing
The idea that dark matter can be made of intermediate-mass primordial black holes (PBHs) in the 10 M ⊙ ≲ M ≲ 200 M ⊙ range has recently been reconsidered...
Long-term Monitoring, Time Delay, and Microlensing in the Gravitational Lens System Q0142-100
We present 12 yr of monitoring of the gravitational lens Q0142-100 from the Teide Observatory. The data, taken from 1999 to 2010, comprise 105 observing nights...
MAGIC detection of sub-TEV emission from gravitationally lensed blazar QSO B0218+357
The blazar QSO B0218+357 is the first gravitationally lensed blazar detected in the very high energy (VHE, E > 100 GeV) gamma-ray spectral range (Ahnen et al...
Mapping variations of redshift distributions with probability integral transforms
We present a method for mapping variations between probability distribution functions and apply this method within the context of measuring galaxy redshift...
Contrary to popular belief, on very large distance scales visible matter stubbornly refuses to "fall" according to the laws of gravity of both Newton and...
Measuring dark matter flows in merging clusters of galaxies
The Rees-Sciama effect produced in mergers of galaxy clusters is discussed, and an analytical approximation to compute this effect from numerical simulations is...
Measuring Microlensing Using Spectra of Multiply Lensed Quasars
We report on a program of spectroscopic observations of gravitationally lensed QSOs with multiple images. We seek to establish whether microlensing is occurring...