Results 51 to 60 of about 15,221 (204)

Large Magellanic Cloud Microlensing Optical Depth with Imperfect Event Selection

, 2005
I present a new analysis of the MACHO Project 5.7 year Large Magellanic Cloud (LMC) microlensing data set that incorporates the effects of contamination of the microlensing event sample by variable stars.
Ansari R., Aubourg E., Beaulieu J. P., Cook K., David P. Bennett, Dominik M., Lasserre T., Sumi T., Udalski A.   +8 more
core   +3 more sources

The Microlensing Properties of a Sample of 87 Lensed Quasars [PDF]

, 2011
Gravitational microlensing is a powerful tool for probing the physical properties of quasar accretion disks and properties of the lens galaxy such as its dark matter fraction and mean stellar mass.
Kochanek, Christopher S., Mosquera, Ana M.   +1 more
core   +1 more source

Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the String‐Theoretical Swampland Programme

Fortschritte der Physik, Volume 74, Issue 4, April 2026.
Abstract String theory has strong implications for cosmology, implying the absence of a cosmological constant, ruling out single‐field slow‐roll inflation, and that black holes decay. The origins of these statements are elucidated within the string‐theoretical swampland programme.
Kay Lehnert
wiley   +1 more source

Empirical Study of Simulated Two-planet Microlensing Event [PDF]

, 2014
We undertake the first study of two-planet microlensing models recovered from simulations of microlensing events generated by realistic multi-planet systems in which 292 planetary events including 16 two-planet events were detected from 6690 simulated ...
Mao, Shude, {Gendron}, R, {Gould}, A, {Mao}, S, {Penny}, M, {Zhu}, W   +5 more
core   +3 more sources

Difference Image Analysis of Galactic Microlensing. II. Microlensing Events

The Astrophysical Journal Supplement Series, 1999
The MACHO collaboration has been carrying out Difference Image Analysis (DIA) since 1996 with the aim of increasing the sensitivity to the detection of gravitational microlensing. This is a preliminary report on the application of DIA to galactic bulge images in one field.
Alcock, Charles, Allsman, Robyn, Alves, David R, Axelrod, Tim, Becker, Andrew C, Bennett, D P, Cook, Kem H, Drake, Andrew John, Freeman, Kenneth, Griest, K, Lehner, M J, Marshall, S L, Minniti, Dante, Peterson, Bruce, Pratt, M, Quinn, Peter J, Stubbs, Christopher W, Sutherland, William J, Tomaney, A B, Vandehei, T, Welch, D L   +20 more
openaire   +7 more sources

Astrometric microlensing [PDF]

International Journal of Modern Physics D, 2017
In the next future, astrometric microlensing will offer a new channel for investigating the nature of both lenses and sources involved in a gravitational microlensing event. The effect, corresponding to the shift of the position of the multiple image centroid with respect to the source star location, is expected to occur on scales from micro ...
NUCITA, Achille, DE PAOLIS, Francesco, INGROSSO, Gabriele, GIORDANO, MOSE', MANNI, luigi   +4 more
openaire   +3 more sources

Unambiguous quasar microlensing [PDF]

, 1998
Microlensing studies of quasars can reveal dark matter lumps over a broad mass spectrum; we highlight the importance of monitoring quasars which are seen through the halos of low-redshift galaxies.
Alcock, Alcock, Baganoff, Boyle, Canizares, Carr, Dalcanton, Draine, Fiedler, Gerhard, Gott, Hawkins, Hawkins, Henriksen, Irwin, Mark A. Walker, Paczyński, Press, Refsdal, Romani, Sahu, Schild, Schmidt, Schneider, Tadros, Vietri, Walker, Walker, Wambsganss, Zhao   +29 more
core   +2 more sources

Two Micron‐Size Dark Dimensions

Fortschritte der Physik, Volume 73, Issue 8, August 2025.
Abstract Two extra dimensions of micron scale might simultaneously address the gauge and cosmological hierarchy problems. In this paper various observational bounds in scenarios with one and two large extra dimensions are examined, to see if they are compatible with the micron scale.
Luis A. Anchordoqui, Ignatios Antoniadis, Dieter Lüst   +2 more
wiley   +1 more source

Astrometric Microlensing by Primordial Black Holes with the Roman Space Telescope

The Astrophysical Journal
Primordial black holes (PBHs) could explain some fraction of dark matter and shed light on many areas of early-Universe physics. Despite over half a century of research interest, a PBH population has so far eluded detection.
James Fardeen, Peter McGill, Scott E. Perkins, William A. Dawson, Natasha S. Abrams, Jessica R. Lu, Ming-Feng Ho, Simeon Bird   +7 more
doaj   +1 more source

Microlensing of Lensed Supernovae

, 2006
Given the number of recently discovered galaxy-galaxy lens systems, we anticipate that a gravitationally lensed supernova will be observed within the next few years.
Charles R. Keeton, Dobler G., Gregory Dobler, Kayser R.   +3 more
core   +1 more source