Download or read book An Improved Measurement of the Hubble Constant Using the Sunyaev Zeldovich Effect written by Brian Scott Mason and published by . This book was released on 1999 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measuring the Hubble Constant Via the Sunyaev Zel dovich Effect written by Keith Grainge and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Hubble Constant Tension written by Eleonora Di Valentino and published by Springer Nature. This book was released on with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measuring and Modeling the Universe Volume 2 Carnegie Observatories Astrophysics Series written by Wendy L. Freedman and published by Cambridge University Press. This book was released on 2004-11-04 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive volume reviews the current theory and measurement of various parameters related to the evolution of the universe. Topics include inflation, string theory and the history of cosmology in the context of current measurements being made of the Hubble constant, matter density, and dark energy. Observational results are included from the Sloan, Digital Sky Survey, Keck, Magellan, cosmic microwave background experiments, Hubble space telescope and Chandra. Featuring chapters by leading authorities in the field, this book is a valuable resource for graduate students and professional research astronomers.
Download or read book NASA s Beyond Einstein Program written by National Research Council and published by National Academies Press. This book was released on 2008-01-19 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Beyond Einstein science" is a term that applies to a set of new scientific challenges at the intersection of physics and astrophysics. Observations of the cosmos now have the potential to extend our basic physical laws beyond where 20th-century research left them. Such observations can provide stringent new tests of Einstein's general theory of relativity, indicate how to extend the Standard Model of elementary-particle physics, and-if direct measurements of gravitational waves were to be made-give astrophysics an entirely new way of observing the universe. In 2003, NASA, working with the astronomy and astrophysics communities, prepared a research roadmap entitled Beyond Einstein: From the Big Bang to Black Holes. This roadmap proposed that NASA undertake space missions in five areas in order to study dark energy, black holes, gravitational radiation, and the inflation of the early universe, to test Einstein's theory of gravitation. This study assesses the five proposed Beyond Einstein mission areas to determine potential scientific impact and technical readiness. Each mission is explored in great detail to aid decisions by NASA regarding both the ordering of the remaining missions and the investment strategy for future technology development within the Beyond Einstein Program.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2000 with total page 852 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Hubble Constant and the lambda CDM Cosmology A Magnified View Using Strong Lensing written by Anowar Jaman Shajib and published by . This book was released on 2020 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, a significant tension has been reported between two measurements of the Hubble constant (H_0) from early-Universe (e.g., cosmic microwave background) and late-Universe probes (e.g., cosmic distance ladder). If systematic errors are ruled out in these measurements, then new physics extending the CDM model will be required to resolve the tension. Therefore, different independent probes of H_0 -- such as the strong-lensing time-delay -- are essential to confirm or resolve the tension. The measured time-delays between the lensed images of a background quasar constrain H_0, as they depend on the absolute physical distances in the lens configuration. I led a team from the STRong-lensing Insights into the Dark Energy Survey (STRIDES) collaboration to analyze the lens DES J0408-5354. I modeled the mass distribution of this lens using Hubble Space Telescope imaging, and combined it with analyses from my collaborators to infer H_0 = 74.2-3.0+2.7 km s^-1 Mpc^-1 with the highest precision (3.9 per cent) from a single lens to date. This measurement agrees well with both the previous sample of six lenses from the H0LiCOW collaboration and other late-Universe probes, thus it increases the aforementioned tension. To confirm or resolve this tension at the 5 level -- the gold standard of detecting new physics -- we need to increase the sample size and improve precision per system while keeping the systematics under control. The large amount of required investigator time (~1 year per lens) is currently the main bottleneck to increase the sample size. I present an automated lens-modeling framework that will enable rapid increment of the sample size in the near future. I also show, through simulation, that incorporating the spatially resolved kinematics of the lensing galaxy improves the precision of H_0 per system. Additionally, I develop the first general method to efficiently compute the lensing properties of any given elliptical mass distribution. By allowing any radial shape of mass profile, this method helps to avoid any systematic that may potentially arise from adopting only a few specific parameterizations. I forecast that a sample of ~40 lenses with spatially resolved kinematics will provide sub-per-cent precision in H_0 within the next decade.
Download or read book Progress in Physics vol 4 2016 written by Dmitri Rabounski and published by Infinite Study. This book was released on with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Journal on Advanced Studies in Theoretical and Experimental Physics, including Related Themes from Mathematics
Download or read book Cosmo 2000 Proceedings Of The Fourth International Workshop On Particle Physics And The Early Universe written by Jihn E Kim and published by World Scientific. This book was released on 2001-09-28 with total page 515 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents reviews and new findings in the field of the very early universe, where the interests of particle theorists and astrophysicists meet. Also, WIMP search experiments are reported.
Download or read book Astronomical Distance Determination in the Space Age written by Richard de Grijs and published by Springer. This book was released on 2019-02-13 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Knowing the distance of an astrophysical object is key to understanding its formation and evolution. Without an accurate distance, we do not know how bright it is, how large it is, or even when it existed. This volume highlights the tremendous amount of recent and continuing research into a myriad of exciting and promising aspects of accurately pinning down the cosmic distance scale, where possible focused on space-based contributions. These papers go one step further, putting the many recent results and new developments into the broader context of the physics driving cosmic distance determination. Thus, the volume will benefit researchers spanning a wide range of expertise, including theorists, observers, and modelers working on a large variety of spatial scales. Originally published in Space Science Reviews in the Topical Collection "Astronomical Distance Determination in the Space Age"
Download or read book The Extragalactic Distance Scale written by Space Telescope Science Institute (U.S.). Symposium and published by Cambridge University Press. This book was released on 1997-06-28 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the hottest debates in astronomy and cosmology today concerns the value of the Hubble constant. This constant is of paramount importance since it fixes the size and age of the Universe. At a symposium at the Space Telescope Science Institute, experts from around the world presented the latest results from a plethora of techniques for determining the Hubble constant. The value has always been controversial, but at this meeting experts' results agreed for the first time to within about 20%. Based on the meeting, this book presents twenty-three specially written review articles. They provide a comprehensive account of the Hubble-constant debate with the latest results from gravitational lensing, supernovae and novae, the Tully-Fisher relation, the Sunyaev-Zeldovich effect, globular clusters, planetary nebulae, light echoes, and the Hubble Space Telescope Key Project. This timely volume provides a standard reference for graduate students and researchers in astronomy and cosmology.
Download or read book Determination of the Hubble Constant Through X ray and Sunyaev Zel dovich Observations written by Oliver Trampleasure and published by . This book was released on 2010 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Massive Neutrinos written by Harald Fritzsch and published by World Scientific Publishing Company. This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the discovery of neutrino oscillations neutrino physics has become an interesting field of research in physics. They imply that neutrino must have a small mass and that the neutrinos, coupled to the charged leptons, are mixtures of the mass eigenstates, analogous to the flavor mixing of the quarks. The mixing angles for the quarks are small, but for the leptons two of the mixing angles are large. The masses of the three neutrinos must be very small, less than 1 eV, but from the oscillation experiments we only know the mass differences -- the absolute masses are still unknown. Also we do not know, if the masses of the neutrinos are Dirac masses, as the masses of the charged leptons and of the quarks, or whether they are Majorana masses.In this volume, an overview of the present state of research in neutrino physics is given by well-known experimentalists and theorists. The contents -- originated from talks and discussions at a recent conference addressing some of the most pressing open questions in neutrino physics -- range from the oscillation experiments to CP-violation for leptons, to texture zero mass matrices and to the role of neutrinos in astrophysics and cosmology.
Download or read book Determination of the Hubble Constant Through X ray and Sunyaev Zel dovich Observations written by and published by . This book was released on 2010 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Hubble Constant H0 Using Extragalactic Background Light Y ray Attenuation written by Hanna Belgardt and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Radiative Processes in Astrophysics written by George B. Rybicki and published by John Wiley & Sons. This book was released on 2008-09-26 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radiative Processes in Astrophysics: This clear, straightforward, and fundamental introduction is designed to present-from a physicist's point of view-radiation processes and their applications to astrophysical phenomena and space science. It covers such topics as radiative transfer theory, relativistic covariance and kinematics, bremsstrahlung radiation, synchrotron radiation, Compton scattering, some plasma effects, and radiative transitions in atoms. Discussion begins with first principles, physically motivating and deriving all results rather than merely presenting finished formulae. However, a reasonably good physics background (introductory quantum mechanics, intermediate electromagnetic theory, special relativity, and some statistical mechanics) is required. Much of this prerequisite material is provided by brief reviews, making the book a self-contained reference for workers in the field as well as the ideal text for senior or first-year graduate students of astronomy, astrophysics, and related physics courses. Radiative Processes in Astrophysics also contains about 75 problems, with solutions, illustrating applications of the material and methods for calculating results. This important and integral section emphasizes physical intuition by presenting important results that are used throughout the main text; it is here that most of the practical astrophysical applications become apparent.
Download or read book The Cosmic Century written by Malcolm S. Longair and published by Cambridge University Press. This book was released on 2006-06-15 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt: The twentieth century witnessed the development of astrophysics and cosmology from subjects which scarcely existed to two of the most exciting and demanding areas of contemporary scientific inquiry. In this book Malcolm Longair reviews the historical development of the key areas of modern astrophysics, linking the strands together to show how they have led to the extraordinarily rich panorama of modern astrophysics and cosmology. While many of the great discoveries were derived from pioneering observations, the emphasis is upon the development of theoretical concepts and how they came to be accepted. These advances have led astrophysicists and cosmologists to ask some of the deepest questions about the nature of our Universe and have pushed astronomical observations to the very limit. This is a fantastic story, and one which would have defied the imaginations of even the greatest storytellers.
