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Author: Chukwuemeka Martins Asogwa Publisher: LAP Lambert Academic Publishing ISBN: 9783659798481 Category : Languages : en Pages : 76
Book Description
Weak gravitational lensing refers to very small distortions of images of background sources (for example galaxies) near a foreground mass (an object which lie between the source and the observer). This effect is studied through coordinate transformation which relates the source coordinate to image coordinate. The derivatives of this transformation is decomposed into trace (convergence) and trace-free part (shear). The trace part magnifies the background sources by increasing their size, and the trace-free part stretches them tangentially with respect to the foreground mass. This book aims to go beyond the usual point source approximation to study the effect of lensing of light from a finite source, which corresponds to lensing of the large scale structures in the universe
Author: Chukwuemeka Martins Asogwa Publisher: LAP Lambert Academic Publishing ISBN: 9783659798481 Category : Languages : en Pages : 76
Book Description
Weak gravitational lensing refers to very small distortions of images of background sources (for example galaxies) near a foreground mass (an object which lie between the source and the observer). This effect is studied through coordinate transformation which relates the source coordinate to image coordinate. The derivatives of this transformation is decomposed into trace (convergence) and trace-free part (shear). The trace part magnifies the background sources by increasing their size, and the trace-free part stretches them tangentially with respect to the foreground mass. This book aims to go beyond the usual point source approximation to study the effect of lensing of light from a finite source, which corresponds to lensing of the large scale structures in the universe
Author: Peter Schneider Publisher: Springer Science & Business Media ISBN: 3540303103 Category : Science Languages : en Pages : 565
Book Description
The observation, in 1919 by A.S. Eddington and collaborators, of the gra- tational de?ection of light by the Sun proved one of the many predictions of Einstein’s Theory of General Relativity: The Sun was the ?rst example of a gravitational lens. In 1936, Albert Einstein published an article in which he suggested - ing stars as gravitational lenses. A year later, Fritz Zwicky pointed out that galaxies would act as lenses much more likely than stars, and also gave a list of possible applications, as a means to determine the dark matter content of galaxies and clusters of galaxies. It was only in 1979 that the ?rst example of an extragalactic gravitational lens was provided by the observation of the distant quasar QSO 0957+0561, by D. Walsh, R.F. Carswell, and R.J. Weymann. A few years later, the ?rst lens showing images in the form of arcs was detected. The theory, observations, and applications of gravitational lensing cons- tute one of the most rapidly growing branches of astrophysics. The gravi- tional de?ection of light generated by mass concentrations along a light path producesmagni?cation,multiplicity,anddistortionofimages,anddelaysp- ton propagation from one line of sight relative to another. The huge amount of scienti?c work produced over the last decade on gravitational lensing has clearly revealed its already substantial and wide impact, and its potential for future astrophysical applications.
Author: Frederic Courbin Publisher: Springer Science & Business Media ISBN: 354044355X Category : Science Languages : en Pages : 202
Book Description
Gravitational lensing is by now sufficiently well understood that it can be used as a tool of investigation in other astrophysical areas. Applications include the determination of the Hubble constant, probing the dark matter context of galaxies and the mapping of the universe to the identification of otherwise invisible large-scale structures. Each chapter of the book covers in a self-contained manner a subfield of gravitational lensing, with the double aim of describing in a simple way the basics of the theory and of reviewing the most recent developments as well as applications foreseen in the near future. The book will thus be particularly useful as a high-level textbook for nonspecialist researchers and advanced students wishing to become familiar with the field all the way up to the forefront of research.
Author: Massimo Meneghetti Publisher: Springer Nature ISBN: 3030735826 Category : Science Languages : en Pages : 412
Book Description
This book introduces the phenomenology of gravitational lensing in an accessible manner and provides a thorough discussion of the related astrophysical applications. It is intended for advanced undergraduates and graduate students who want to start working in this rapidly evolving field. This includes also senior researchers who are interested in ongoing or future surveys and missions such as DES, Euclid, WFIRST, LSST. The reader is guided through many fascinating topics related to gravitational lensing like the structure of our galaxy, the searching for exoplanets, the investigation of dark matter in galaxies and galaxy clusters, and several aspects of cosmology, including dark energy and the cosmic microwave background. The author, who has gained valuable experience as academic teacher, guides the readers towards the comprehension of the theory of gravitational lensing and related observational techniques by using simple codes written in python. This approach, beyond facilitating the understanding of gravitational lensing, is preparatory for learning the python programming language which is gaining large popularity both in academia and in the private sector.
Author: P. Schneider Publisher: Springer Science & Business Media ISBN: 3662037580 Category : Science Languages : en Pages : 564
Book Description
Light observed from distant objects is found to be deflected by the gravitational field of massive objects near the line of sight - an effect predicted by Einstein in his first paper setting forth the general theory of relativity, and confirmed by Eddington soon afterwards. If the source of the light is sufficiently distant and bright, and if the intervening object is massive enough and near enough to the line of sight, the gravitational field acts like a lens, focusing the light and producing one or more bright images of the source. This book, by renowned researchers in the field, begins by discussing the basic physics behind gravitational lenses: the optics of curved space-time. It then derives the appropriate equations for predicting the properties of these lenses. In addition, it presents up-to-date observational evidence for gravitational lenses and describes the particular properties of the observed cases. The authors also discuss applications of the results to problems in cosmology.
Author: Chukwuemeka Martins Asogwa
Author: Silvia Mollerach
Author: Marc Gentile
Author: Chukwuemeka Martins Asogwa
Author: Peter Schneider
Author: Frederic Courbin
Author: Tzu-Ching Chang
Author: Massimo Meneghetti
Author: Malin Nicole Renneby
Author: Scott Dodelson
Author: P. Schneider