Results 51 to 60 of about 10,480 (204)
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 +2 more
wiley +1 more source
Astronomical Signatures of Dark Matter
Advances in High Energy Physics, Volume 2014, Issue 1, 2014., 2014 Several independent astronomical observations in different wavelength bands reveal the existence of much larger quantities of matter than what we would deduce from assuming a solar mass to light ratio. They are very high velocities of individual galaxies within clusters of galaxies, higher than expected rotation rates of stars in the outer regions of ...
Paul Gorenstein +2 more
wiley +1 more source
Modeling Binary Lenses and Sources with the BAGLE Python Package
The Astrophysical JournalGravitational microlensing is a powerful tool that can be used to find and measure the mass of isolated and dark compact objects. In many microlensing events, the lens, the source, or both may be binary systems.
T. Dex Bhadra +6 more
doaj +1 more source
The Galactic Exoplanet Survey Telescope (GEST)
, 2002 The Galactic Exoplanet Survey Telescope (GEST) will observe a 2 square degree field in the Galactic bulge to search for extra-solar planets using a gravitational lensing technique.
Bally, J. +24 more
core +1 more source
Die Suche nach kalten, fremden Welten
Physik in unserer Zeit, Volume 55, Issue 3, Page 140-147, May 2024.Die meisten der heute bekannten extrasolaren Planeten umkreisen ihren Mutterstern auf engen Umlaufbahnen in weniger als 100 Tagen. Gesteinsplaneten mit größeren Bahnradien sind von herausragender Bedeutung für Theorien der Planetenentstehung. Die Mikrogravitationslinsenmethode bietet eine hervorragende Möglichkeit, solche Planeten zu finden – und das ...
Markus Hundertmark, Yiannis Tsapras
wiley +1 more source
Analytical Methods in Gravitational Microlensing
International Scholarly Research Notices, Volume 2012, Issue 1, 2012., 2012 We discuss analytical results dealing with photometric and astrometric gravitational microlensing. The first two sections concern approximation methods that allow us to get solutions of the general lens equation near fold caustics and cusp points up to any prescribed accuracy.
V. I. Zhdanov +5 more
wiley +1 more source
The Astrophysical Journal LettersMagnification of total image fluxes is typically considered a defining feature of gravitational microlensing. In contrast, I will show that nonminimal couplings to gravity can generate regions of negative gravitational potential curvature, giving rise to
Hong-Yi Zhang
doaj +1 more source
Acceleration and parallax effects in gravitational microlensing [PDF]
Monthly Notices of the Royal Astronomical Society, 2003 24 pages, 5 figures (in colour). Accepted for publication in MNRAS. Minor error in Appendix B corrected (Results of paper unaffected)
Smith, Martin C. +2 more
openaire +2 more sources
Dark Matter Halos from the Inside Out
Advances in Astronomy, Volume 2011, Issue 1, 2011., 2011 The balance of evidence indicates that individual galaxies and groups or clusters of galaxies are embedded in enormous distributions of cold, weakly interacting dark matter. These dark matter “halos” provide the scaffolding for all luminous structures in the universe, and their properties comprise an essential part of the current cosmological model.
James E. Taylor, Rob Ivison
wiley +1 more source
Four Planets Found through Microlensing Events Involving Faint Source Stars
The Astronomical JournalTo conduct a comprehensive demographic study of microlensing planets, it is essential to detect all planetary signals that exceed a predefined threshold through a detailed analysis of survey data.
Cheongho Han +20 more
doaj +1 more source