Download or read book Measurement of the Large scale Anisotropy of the Cosmic Background Radiation at 3 Mm written by Gerald Lewis Epstein and published by . This book was released on 1984 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Large scale Anisotropy of the Cosmic Background Radiation at 3mm written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A balloon-borne differential radiometer has measured the large-scale anisotropy of the cosmic background radiation (CBR) with high sensitivity. The antenna temperature dipole anistropy at 90 GHz (3 mm wavelength) is 2.82 +- 0.19 mK, corresponding to a thermodynamic anistropy of 3.48 +- mK for a 2.7 K blackbody CBR. The dipole direction, 11.3 +- 0.1 hours right ascension and -5.7° +- 1.8° declination, agrees well with measurements at other frequencies. Calibration error dominates magnitude uncertainty, with statistical errors on dipole terms being under 0.1 mK. No significant quadrupole power is found, placing a 90% confidence-level upper limit of 0.27 mK on the RMS thermodynamic quadrupolar anistropy. 22 figures, 17 tables.

Download or read book Measurement of the Large scale Anistropy of the Cosmic Background Radiation at 3mm written by Gerald Lewis Epstein and published by . This book was released on 1983 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 3 Mm Anisotropy Measurement written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have mapped the large-scale anisotropy in the cosmic background radiation at 3 mm wavelength using a liquid-helium-cooled balloon-borne radiometer sensitive enough to detect the dipole in one gondola rotation (1 minute). Statistical errors on the dipole and quadrupole components are below 0.1 mK with less than 0.1 m K galactic contribution. We find a dipole consistent with previous measurements but disagree with recent quadrupole reports. The measurement is also useful in searching for spectral distortions.

Download or read book Anisotropy Measurements of the Cosmic Background Radiation at 3 Mm Wavelength and an Angular Scale of 30 Arcminutes written by Peter Russell Meinhold and published by . This book was released on 1990 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Measurement of Anisotropy in the Cosmic Background Radiation on a Large Angular Scale at 33 GHz written by Marc Victor Gorenstein and published by . This book was released on 1978 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of Anisotropy in the Cosmic Background Radiation on a Large Angular Scale at 33 GHz written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of a measurement of anisotropy in the 3 °K cosmic background radiation on a large-angular-scale are presented. Observations were carried out with a dual-antenna microwave radiometer operating at 33 GHz (0.89 cm wavelength) flown on board a U-2 aircraft to 20-km altitude. In eleven flights, between December 1976 and May 1978, the radiometer measured differential intensity between pairs of directions distributed over most of the northern celestial hemisphere with an rms sensitivity of +- 46m°K/.sqrt. Hz. The measurements show clear evidence of anisotropy that is readily interpreted as due to the motion of the earth relative to the sources of the radiation; the anisotropy is well fit by a cosine distribution of amplitude 3.61 +- 0.54 millireverse arrowreverse arrow-degrees Kelvin (m°K), one part in 800 of 3°K, implying a velocity of 361 +- 54 km/sec toward the direction 11.23 +- 0.46 hours right ascension, and 19.0 +- 7.5° declination. A simultaneous fit to a combined hypothesis of dipole (cos theta) and quadrupole (cos2 theta) angular distributions places a 1 m°K limit on the amplitude of most components of quadruple anisotropy with 90% confidence. Additional analysis places a 0.5 m °K limit on uncorrelated fluctuations (sky-roughness) in the 3°K background on an angular scale of the antenna beam width, about 7°. This thesis describes the equipment development through three engineering flights and the data acquisition in eleven additional flights. The astrophysical results are then presented from the statistical analysis of the reduced data.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Large Angular Scale Anisotropy in the Cosmic BackgroundRadiation written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report the results of an extended series of airborne measurements of large-angular-scale anisotropy in the 3 K cosmic background radiation. Observations were carried out with a dual-antenna microwave radiometer operating at 33 GHz (0.89 cm wavelength) flown on board a U-2 aircraft to 20 km altitude. In eleven flights, between December 1976 and May 1978, the radiometer measured differential intensity between pairs of directions distributed over most of the northern hemisphere with an rms sensitivity of 47 mK Hz−12. The measurements show clear evidence of anisotropy that is readily interpreted as due to the solar motion relative to the sources of the radiation. The anisotropy is well fit by a first order spherical harmonic of amplitude 360 ± 50km sec−1 toward the direction 11.2 ± 0.5 hours of right ascension and 19 ± 8 degrees declination. A simultaneous fit to a combined hypothesis of dipole and quadrupole angular distributions places a 1 mK limit on the amplitude of most components of quadrupole anisotropy with 90% confidence. Additional analysis places a 0.5 mK limit on uncorrelated fluctuations (sky-roughness) in the 3 K background on an angular scale of the antenna beam width, about 7 degrees.

Download or read book The Early Universe and the Cosmic Microwave Background Theory and Observations written by Norma G. Sànchez and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 583 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of the Daniel Chalonge School on Astrofundamental Physics is to contribute to a theory of the universe (and particularly of the early universe) up to the marks, and at the scientific height of, the unprecedented accuracy, existent and expected, in the observational data. The impressive development of modern cosmology during the last decades is to a large extent due to its unification with elementary particle physics and quantum field theory. The cross-section between these fields has been increasing setting up Astrofundamental Physics. The early universe is an exceptional (theoretical and experimental) laboratory in this new discipline. This NATO Advanced Study Institute provided an up dated understanding, from a fundamental physics and deep point of view, of the progress and key issues in the early universe and the cosmic microwave background: theory and observations. The genuine interplay with large scale structure formation and dark matter problem were discussed. The central focus was placed on the cosmic microwave background. Emphasis was given to the precise inter-relation between fundamental physics and cosmology in these problems, both at the theoretical and experimental/observational levels, within a deep and well defined programme which provided in addition, a careful interdisciplinarity. Special sessions were devoted to high energy cosmic rays, neutrinos in astrophysics, and high energy astrophysics. Deep understanding, clarification, synthesis, careful interdisciplinarity within a fundamental physics framework, were the main goals of the course.

Download or read book Measurements of the Cosmic Background Radiation written by Jeffrey Arthur Schuster and published by . This book was released on 1994 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Measurement of the Cosmic Background Radiation Temperature at 3 3 Mm Wavelength written by Chris Witebsky and published by . This book was released on 1985 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Oxford Handbook of the History of Modern Cosmology written by Helge Kragh and published by Oxford University Press. This book was released on 2019-03-06 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientific and popular literature on modern cosmology is very extensive; however, scholarly works on the historical development of cosmology are few and scattered. The Oxford Handbook of the History of Modern Cosmology offers a comprehensive and authoritative account of the history of cosmology from the late nineteenth century to the early twenty-first century. It provides historical background to what we know about the universe today, including not only the successes but also the many false starts. Big Bang theory features prominently, but so does the defunct steady state theory. The book starts with a chapter on the pre-Einstein period (1860-1910) and ends with chapters on modern developments such as inflation, dark energy and multiverse hypotheses. The chapters are organized chronologically, with some focusing on theory and others more on observations and technological advances. A few of the chapters discuss more general ideas, relating to larger contexts such as politics, economy, philosophy and world views.

Download or read book Los Alamos Science written by and published by . This book was released on 1994 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nobel Lectures In Physics 2006 2010 written by Lars Brink and published by World Scientific. This book was released on 2014-06-02 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is a collection of the Nobel lectures delivered by the prizewinners, together with their biographies and the presentation speeches by Nobel Committee members for the period 2006-2010. The criterion for the Physics award is to the discoverer of a physical phenomenon that changed our views, or to the inventor of a new physical process that gave enormous benefits to either science at large or to the public. The biographies are remarkably interesting to read and the Nobel lectures provide detailed explanations of the phenomena for which the Laureates were awarded the Nobel Prize.Aspiring young scientists as well as more experienced ones, but also the interested public will learn a lot from and appreciate the geniuses of these narrations.List of prizewinners and their discoveries:(2006) to John C Mather and George F Smoot “for their discovery of the blackbody form and anisotropy of the cosmic microwave background radiation” The very detailed observations that the Laureates have carried out from the COBE satellite have played a major role in the development of modern cosmology into a precise science.(2007) to Albert Fert and Peter Grünberg “for the discovery of Giant Magnetoresistance” Applications of this phenomenon have revolutionized techniques for retrieving data from hard disks. The discovery also plays a major role in various magnetic sensors as well as for the development of a new generation of electronics. The use of Giant Magnetoresistance can be regarded as one of the first major applications of nanotechnology.(2008) to Yoichiro Nambu “for the discovery of the mechanism of spontaneous broken symmetry in subatomic physics“, and to Makoto Kobayashi and Toshihide Maskawa “for the discovery of the origin of the broken symmetry which predicts the existence of at least three families of quarks in nature” Why is there something instead of nothing? Why are there so many different elementary particles? The Laureates presented theoretical insights that give us a deeper understanding of what happens far inside the tiniest building blocks of matter.(2009) to Charles Kuen Kao “for groundbreaking achievements concerning the transmission of light in fibers for optical communication“, and to Willard S Boyle and George E Smith “for the invention of an imaging semiconductor circuit — the CCD sensor” Kao's discoveries have paved the way for optical fiber technology, which today is used for almost all telephony and data communication. Boyle and Smith have invented a digital image sensor — CCD, or charge-coupled device — which today has become an electronic eye in almost all areas of photography.(2010) to Andre Geim and Konstantin Novoselov “for groundbreaking experiments regarding the two-dimensional material graphene” The Laureates have shown that a thin flake of ordinary carbon, just one atom thick, has exceptional properties that originate from the remarkable world of quantum physics.

Download or read book Proceedings American Philosophical Society vol 119 No 4 1975 written by and published by American Philosophical Society. This book was released on with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Particle Physics and Cosmology Dark Matter written by M. Srednicki and published by Elsevier. This book was released on 2012-12-02 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: At least eighty percent of the mass of the universe consists of some material which, unlike ordinary matter, neither emits nor absorbs light. This book collects key papers related to the discovery of this astonishing fact and its profound implications for astrophysics, cosmology, and the physics of elementary particles. The book focuses on the likely possibility that the dark matter is composed of an as yet undiscovered elementary particle, and examines the boundaries of our present knowledge of the properties such a particle must possess.