Strong Gravitational Lensing and Dark Energy
نویسندگان
چکیده
منابع مشابه
Strong Gravitational Lensing and Dark Energy Complementarity
In the search for the nature of dark energy most cosmological probes measure simple functions of the expansion rate. While powerful, these all involve roughly the same dependence on the dark energy equation of state parameters, with anticorrelation between its present value w0 and time variation wa. Quantities that have instead positive correlation and so a sensitivity direction largely orthogo...
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We discuss the ratio of the angular diameter distances from the source to the lens, Dds, and to the observer at present, Ds, for various dark energy models. It is well known that the difference of Dss between the models is apparent and this quantity is used for the analysis of Type Ia supernovae. However we investigate the difference between the ratio of the angular diameter distances for a cos...
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In the standard flat cosmological constant (Λ) cold dark matter (CDM) cosmology, a model of two populations of lens halos for strong gravitational lensing can reproduce the results of the Jodrell-Bank VLA Astrometric Survey (JVAS) and the Cosmic Lens All-Sky Survey (CLASS) radio survey. In such a model, lensing probabilities are sensitive to three parameters: the concentration parameter c1, the...
متن کاملCluster Strong Lensing Constraints on Dark Energy
Cluster strong lensing can be used to obtain constraints on cosmological parameters, in particular as we show here, the dark energy equation of state. This is achieved by using multiple images of sources at two or more distinct redshift planes. Utilizing many families of multiply imaged sources we obtain purely geometric constraints on dark energy that are largely independent of the properties ...
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Using the number and sizes of observed gravitational lenses, I derive upper limits on the dark matter content of elliptical galaxies. On average, dark matter can account for no more than 33% of the total mass within one effective radius (Re) of elliptical galaxies, or 40% of the mass within 2Re (95% confidence upper limits). I show that galaxies built from Cold Dark Matter (CDM) mass distributi...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2001
ISSN: 0004-637X
DOI: 10.1086/324679