Gravitational lens frequencies and the cosmological constant: an examination of amplification bias and galaxy formation redshift
نویسندگان
چکیده
منابع مشابه
formation and evolution of regional organizations: the case study of the economic cooperation organization (eco)
abstract because of the many geopolitical, geo economical and geo strategically potentials and communicational capabilities of eco region, members can expand the convergence and the integration in base of this organization that have important impact on members development and expanding peace in international and regional level. based on quality analyzing of library findings and experts interv...
15 صفحه اولGravitational Lens Image Separations Versus Redshift as a Cosmological Test
It has recently been noted by Park & Gott (1997) that there is a statistically significant negative correlation between gravitational lens image separations and source redshifts. This negative correlation is puzzling since is cannot be explained with any realistic models both in flat and open cosmologies, while ususal lens statistics, such as number density and distribution of image separation,...
متن کاملTime Evolution of Galaxy Formation and Bias in Cosmological Simulations
The clustering of galaxies relative to the underlying mass distribution declines with cosmic time for three reasons. First, nonlinear peaks become less rare events as the density field evolves. Second, the densest regions stop forming new galaxies because their gas becomes too hot to cool and collapse. Third, after galaxies form, they are subject to the same gravitational forces as the dark mat...
متن کاملan investigation into iranian teachers consistency and bias in evaluation of students writings
while performance-based language assessment has led to an increased authenticity and content validity in the practice of writing assessment, the reliability of ratings has become a major issue. research findings have shown different reactions by native english speaker (nes) and non-native english speaker (nns) teachers to students’ writings. the focus of this study is on investigating whether i...
Gravitational Gauge Fields and the Cosmological Constant
ADSTRACT We describe field theories for which the action is completely independent of the metric and connection of the space-time manifold. The metric in our approach is no more a fundamental field than a hadron field is a fundamental field in &CD. The fundamental fields in the action are O(5) gauge fields and combinations of these fields are interpreted as the metric and connection so that con...
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: Monthly Notices of the Royal Astronomical Society
سال: 1993
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/262.3.681