Lensing Limits On the Cosmological Constant
نویسندگان
چکیده
منابع مشابه
New Limits on a Cosmological Constant from Statistics of Gravitational Lensing
We present new limits on cosmological parameters from the statistics of gravitational lensing, based on the recently revised knowledge of the luminosity function and internal dynamics of E/S0 galaxies that are essential in lensing high-redshift QSOs. We find that the lens models using updated Schechter parameters for such galaxies, derived from the recent redshift surveys combined with morpholo...
متن کاملGravitational lensing statistics and constraints on the cosmological constant revisited
We re-analyze constraints on the cosmological constant that can be obtained by examining the statistics of strong gravitational lensing of distant quasars by intervening galaxies, focusing on on uncertainties in galaxy models (including velocity dispersion, luminosity functions, core radii and magnification bias effects) and on the parameters of the galaxy distribution and luminosity functions....
متن کاملGravitational Lensing and Tests of the Cosmological Constant
The case for a flat Cold Dark Matter model with a positive cosmological constant Λ has been recently strongly advocated by some theoreticians. In this paper we give the observers point of view to the light of the most recent observations with a special emphasis on lensing tests. We confirm the apparent cosmic concordance for a flat Universe with ΩΛ close to 0.6 but we note that a low mass densi...
متن کاملOn the influence of the cosmological constant on gravitational lensing in small systems
The cosmological constant Λ affects gravitational lensing phenomena. Following a study of the equations of motion of the Schwarzschild-de Sitter metric in the weak deflection limit, the contribution of Λ to the observable angular positions of multiple images and to their amplification and time delay is computed. Due to Λ the unresolved images are slightly demagnified, the radius of the Einstein...
متن کاملA cosmological constant limits the size of black holes.
In a space-time with cosmological constant Λ > 0 and matter satisfying the dominant energy condition, the area of a black or white hole cannot exceed 4π/Λ. This applies to event horizons where defined, i.e. in an asymptotically deSitter space-time, and to outer trapping horizons (cf. apparent horizons) in any space-time. The bound is attained if and only if the horizon is identical to that of t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1996
ISSN: 0074-1809
DOI: 10.1017/s0074180900230787