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Author: Jeffrey Benson Jewell
Publisher:
ISBN:
Category :
Languages : en
Pages : 126
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Book Description
Author: Jeffrey Benson Jewell
Publisher:
ISBN:
Category :
Languages : en
Pages : 126
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Book Description
Author: Marc Lachièze-Rey
Publisher: Springer Science & Business Media
ISBN: 9401144559
Category : Science
Languages : en
Pages : 413
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Book Description
A complete account of the fundamental techniques of general relativity and their application to cosmology. The book includes reviews of the different cosmological models and their classification, including such topics as causality and horizons, the cosmological parameters, observational tests and constraints of cosmology, symmetries and the large scale topology of space and space-time, and the use of supernovas as cosmological indicators. The perturbations to the cosmological models are discussed throughout the volume. The cosmic microwave background is presented, with an emphasis in secondary distortions in relation to cosmological models and large scale structures. Recent results on dark matter are summarised. A general review of primordial nucleosynthesis is given. Gravitational lensing is discussed in great detail. Most contributions show a balance between theory and observation. Readership: A solid background for students and researchers intending to work in the field of theoretical and observational cosmology.
Author: Gregory Bothun
Publisher: CRC Press
ISBN: 9780748406456
Category : Science
Languages : en
Pages : 324
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Book Description
In recent years an enormous amount of cosmological data has come from well known projects such as the Hubble Space Telescope (HST) and the Cosmic Background Explorer (COBE). This book explains and makes sense of this vast array of new observational data in terms of its impact on current cosmological models. With new theories and a plethora of data feeding cosmology in the 1990s, Gregory Bothun sets about the task of re- assessing our cosmological models. He outlines exactly what the latest observations are, and how they should be seen as either consistent or in conflict with current cosmogenic scenarios. In this search for a reconciliation of current data with competing theory, he explains how Einstein's idea of a cosmological constant has now become a viable hypothesis. This authoritative text should be valuable to all those studying cosmological observations at advanced undergraduate or beginning graduate level. Bothun draws a path through cosmology by defining a trajectory that is based on the data. This should also provide a framework for professional cosmologists and related readers in physics as it presents a solid observational foundation which either supports or conflicts with present theory. The book is illustrated including many CCD images of galaxies. Given the rapidly changing nature of the field, this book is supported by a World Wide Web site of supplementary material that is designed to readily update the material in the book.
Author: Muhammad Omer Farooq
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The expansion rate of the Universe changes with time, initially slowing (decelerating) when the universe was matter dominated, because of the mutual gravitational attraction of all the matter in it, and more recently speeding up (accelerating). A number of cosmological observations now strongly support the idea that the Universe is spatially flat (provided the dark energy density is at least approximately time independent) and is currently undergoing an accelerated cosmological expansion. A majority of cosmologists consider "dark energy" to be the cause of this observed accelerated cosmological expansion. The "standard" model of cosmology is the spatially-flat ACDM model. Although most predictions of the ACDM model are reasonably consistent with measurements, the ACDM model has some curious features. To overcome these difficulties, different Dark Energy models have been proposed. Two of these models, the XCDM parametrization and the slow rolling scalar field model [phi]CDM, along with "standard" ACDM, with the generalization of XCDM and [phi]CDM in non-flat spatial geometries are considered here and observational data are used to constrain their parameter sets. In this thesis, we start with a overview of the general theory of relativity, Friedmann's equations, and distance measures in cosmology. In the following chapters we explain how we can constrain the three above mentioned cosmological models using three data sets: measurements of the Hubble parameter H(z), Supernova (SN) apparent magnitudes, and the baryonic acoustic oscillations (BAO) peak length scale, as functions of redshift z. We then discuss constraints on the deceleration-acceleration transition redshift z[subscript]d[subscript]a using unbinned and binned H(z) data. Finally, we incorporate the spatial curvature in the XCDM and [phi]CDM model and determine observational constraints on the parameters of these expanded models.
Author: Shao-Chin Cindy Ng
Publisher:
ISBN:
Category : Cosmology
Languages : en
Pages : 214
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Book Description
Studies different models of "quintessence", in particular, a quintessence arising from an ultra-light pseudo Nambu-Goldstone boson. Overviews dynamical properties for these models using phase-space analyses to study attractor and tracker solutions. Studies high-redshift type Ia supernovae constraints on these models. Studies the impact of a simple phenomenological model for supernovae luminosity evolution on the PNGB models and the potentials of a future supernovae data set to discriminate the PNGB models over the other quintessence models. Studies gravitational lensing statistics of high luminosity quasars upon the quintessence models.
Author: Data Mania
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Recent observations in cosmology suggest that the universe is undergoing accelerating expansion. Mysterious component responsible for acceleration is called "Dark Energy" contributing to 70% of total energy density of the universe. Simplest DE model is [Lambda]CDM, where Einsteins cosmological constant plays role of the dark energy. Despite the fact that it is consistent with observational data, it leaves some important theoretical questions unanswered. To overcome these difficulties different Dark energy models are proposed. Two of these models XCDM parametrization and slow rolling scalar field model [phi]CDM, along with "standard" [Lambda]CDM are disscussed here, constraining their parameter set. In this thesis we start with a general theoretical overview of basic ideas and distance measures in cosmology. In the following chapters we use H II starburst galaxy apparent magnitude versus redshift data from Siegel et al.(2005) to constrain DE model parameters. These constraints are generally consistent with those derived using other data sets, but are not as restrictive as the tightest currently available constraints. Also we constrain above mentioned cosmological models in light of 32 age measurements of passively evolving galaxies as a function of redshift and recent estimates of the product of the cosmic microwave background acoustic scale and the baryon acoustic oscillation peak scale.
Author: Alina-Mihaela Badescu
Publisher: LAP Lambert Academic Publishing
ISBN: 9783846585306
Category :
Languages : en
Pages : 84
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Book Description
Over the last decade, observations have shown that the visible and dark matter combined amount to less than half the content of the Universe. The remaining is dark energy with a strange and unique feature: it repels. Many cosmologists, though, are now leaning toward a different idea, known as quintessence. The dynamism is what cosmologists find so appealing about quintessence. While vacuum energy is completely inert, the quintessence interacts with matter and evolves with time, so it might naturally adjust itself to reach the observed value today. Recent observations have shown that the Universe is not only expanding, but it is accelerating. Due to cosmic expansion and curvature of space-time, observing distanced objects becomes difficult. For constraining the parameters that describe the Universe one needs measurements obtained independently of the cosmological model: angular diameter, luminosity distance, the Hubble parameter at different redshifts and the first acoustic peak from the power spectrum of the cosmic microwave background. Data will be fitted to test the quintessence model and hopefully to answer the question: "What kind of Universe do we live in?"
Author: José Luis Sanz
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 372
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Book Description
Black holes, pregalactic stars, and the dark matter problem; Primordial nucleosynthesis and the gravitino problem; The X-ray background; Cosmology and galaxy formation - an introduction to some recent results; Clean relativistic binaries: some observational consequences of the CM velocity; Relativistic cosmological models; Present and future of high resolution radio observations of active galactic nuclei; The halo puzzle; The microwave background radiation; Soltions and the generation of new cosmologica solutions; List of participants.
Author: Baojiu Li
Publisher:
ISBN: 9780750319324
Category :
Languages : en
Pages : 198
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Book Description
Author: Natalia V. Zotov
Publisher:
ISBN:
Category : Cosmology
Languages : en
Pages : 426
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Book Description
