Download or read book The Search for Non Newtonian Gravity written by Ephraim Fischbach and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: A history of the attempts to test the predictions of Newtonian Gravity, describing in detail recent experimental efforts to verify both the inverse-square law and the Equivalence Principle. Interest in these questions has increased in recent years, as it has become recognised that deviations from Newtonian gravity could be a signal for a new fundamental force in nature. This is the first book devoted entirely to this subject, and will thus be useful to both graduate students and researchers interested in this field. It describes the ideas that underlie searches for such deviations, focusing on macroscopic tests. A comprehensive bibliography of some 450 entries supplements the text.
Download or read book Search for Non Newtonian Gravity written by Bruno Hubler and published by . This book was released on 1994 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Developments in the Search for Non newtonian Gravity Below the 25 Micron Length Scale written by Andrew A. Geraci and published by . This book was released on 2007 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several recent theories suggest that new physics related to gravity may appear at short length scales. For example, light moduli from string theory or exotic particles in "large" extra dimensions could mediate macroscopic forces of (super) gravitational strength at length scales below a millimeter. Such new forces can be parameterized as a Yukawa-type correction to the Newtonian potential of strength relative to gravity alpha and range lambda. With this motivation, we have built a cryogenic apparatus utilizing micro-cantilevers capable of measuring atto-Newton forces, which now includes a magnetic force calibration. The cantilever is loaded with a rectangular gold prism fabricated by focused-ion-beam milling that serves as a test mass for the experiment. The driving (source) mass is actuated horizontally beneath the cantilever at a vertical separation of order 25 microns. The force between the masses is deduced from the displacement of the cantilever as measured by a fiber-coupled laser interferometer. We perform the measurement at the cantilever resonant frequency, typically of order 300 Hz, while the mechanical driving motion occurs at a sub-harmonic, typically one-third. This is achieved by implementing a density modulation in the drive mass, consisting of alternating gold and silicon sections. For the new magnetic calibration, Co/Pt multi-layer films are deposited on the test mass. The permanent magnetic moment couples to an induced magnetic field gradient as current flows across the meandering gold sections in the drive mass device. The current is turned off for the Yukawa-force search. A mu-metal shield encloses the cryostat to prevent the Earth's field from magnetizing the drive mass. The amplitude and phase of a magnetic or Yukawa signal will change in a predictable way as we vary the equilibrium position of the drive mass oscillation. We utilize this scanning technique as an additional handle to distinguish a signal from background forces. Our most recent experimental constraints on Yukawa-type deviations from Newtonian gravity are more than three times as stringent as our previously published results, and represent the best bound in the range of 5--15 microns, with a 95-percent confidence exclusion of forces with alpha > 14,000 at lambda of 10 microns.
Download or read book Constraints on Non Newtonian Gravity From the Experiment on Neutron Quantum States in the Earth s Gravitational Field written by and published by DIANE Publishing. This book was released on with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Non Newtonian Gravity Or Gravity Anomalies written by David P. Rubincam and published by . This book was released on 1988 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Gravitational Constant Generalized Gravitational Theories and Experiments written by V. de Sabbata and published by Springer Science & Business Media. This book was released on 2004-03-31 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: An up-to-date description of progress and current problems with the gravitational constant, both in terms of generalized gravitational theories and experiments either in the laboratory, using Casimir force measurements, or in space at solar system distances and in cosmological observations. Contributions cover different aspects of the state and prediction of unified theories of the physical interactions including gravitation as a cardinal link, the role of experimental gravitation and observational cosmology in discriminating between them, the problem of the precise measurement and stability of fundamental physical constants in space and time, and the gravitational constant in particular. Recent advances discussed include unified and scalar-tensor theories, theories in diverse dimensions and their observational windows, gravitational experiments in space, rotational and torsional effects in gravity, basic problems in cosmology, early universe as an arena for testing unified models, and big bang nucleosynthesis.
Download or read book Non Newtonian Gravity Or Gravity Anomalies written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-12-29 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geophysical measurements of G differ from laboratory values, indicating that gravity may be non-Newtonian. A spherical harmonic formulation is presented for the variation of (Newtonian) gravity inside the Earth. Using the GEM-10B Earth Gravitational Field Model, it is shown that long-wavelength gravity anomalies, if not corrected, may masquerade as non-Newtonian gravity by providing significant influences on experimental observation of delta g/delta r and G. An apparent contradiction in other studies is also resolved: i.e., local densities appear in equations when average densities of layers seem to be called for. Rubincam, David P. and Chao, B. Fong and Schatten, Kenneth H. and Sager, William W. Goddard Space Flight Center NASA-TM-4030, REPT-88B0104, NAS 1.15:4030 ...
Download or read book Non Newtonian Gravity Or Gravity Anomalies written by David P. Rubincam and published by . This book was released on 1988 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modified and Quantum Gravity written by Christian Pfeifer and published by Springer Nature. This book was released on 2023-11-01 with total page 557 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses theoretical predictions and their comparison with experiments of extended and modified classical and quantum theories of gravity. The goal is to provide a readable access and broad overview over different approaches to the topic to graduate and PhD students as well as to young researchers. The book presents both, theoretical and experimental insights and is structured in three parts. The first addresses the theoretical models beyond special and general relativity such as string theory, Poincare gauge theory and teleparallelism as well as Finsler gravity. In turn, the second part is focused on the observational effects that these models generate, accounting for tests and comparisons which can be made on all possible scales: from the universe as a whole via binary systems, stars, black holes, satellite experiments, down to laboratory experiments at micrometer and smaller scales. The last part of this book is dedicated to quantum systems and gravity, showing tests of classical gravity with quantum systems, and coupling of quantum matter and gravity.
Download or read book Non Newtonian Gravity and New Weak Forces written by E. Fischbach and published by . This book was released on 1992 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Rise and Fall of the Fifth Force written by Allan Franklin and published by Springer. This book was released on 2016-03-03 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides the reader with a detailed and captivating account of the story where, for the first time, physicists ventured into proposing a new force of nature beyond the four known ones - the electromagnetic, weak and strong forces, and gravitation - based entirely on the reanalysis of existing experimental data. Back in 1986, Ephraim Fischbach, Sam Aronson, Carrick Talmadge and their collaborators proposed a modification of Newton’s Law of universal gravitation. Underlying this proposal were three tantalizing pieces of evidence: 1) an energy dependence of the CP (particle-antiparticle and reflection symmetry) parameters, 2) differences between the measurements of G, the universal gravitational constant, in laboratories and in mineshafts, and 3) a reanalysis of the Eötvos experiment, which had previously been used to show that the gravitational mass of an object and its inertia mass were equal to approximately one part in a billion. The reanalysis revealed that, contrary to Galileo’s position, the force of gravity was in fact very slightly different for different substances. The resulting Fifth Force hypothesis included this composition dependence and also added a small distance dependence to the inverse-square gravitational force. Over the next four years numerous experiments were performed to test the hypothesis. By 1990 there was overwhelming evidence that the Fifth Force, as initially proposed, did not exist. This book discusses how the Fifth Force hypothesis came to be proposed and how it went on to become a showcase of discovery, pursuit and justification in modern physics, prior to its demise. In this new and significantly expanded edition, the material from the first edition is complemented by two essays, one containing Fischbach’s personal reminiscences of the proposal, and a second on the ongoing history and impact of the Fifth Force hypothesis from 1990 to the present.
Download or read book Theory and Experiment in Gravitational Physics written by Clifford M. Will and published by Cambridge University Press. This book was released on 2018-09-27 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive review of the testing and research conducted on Einstein's theory of general relativity.
Download or read book Measuring Nothing Repeatedly written by Allan Franklin and published by Morgan & Claypool Publishers. This book was released on 2019-12-10 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: There have been many recent discussions of the 'replication crisis' in psychology and other social sciences. This has been attributed, in part, to the fact that researchers hesitate to submit null results and journals fail to publish such results. In this book Allan Franklin and Ronald Laymon analyze what constitutes a null result and present evidence, covering a 400-year history, that null results play significant roles in physics.
Download or read book 100 Years of Chronogeometrodynamics The Status of the Einstein s Theory of Gravitation in Its Centennial Year written by Lorenzo Iorio and published by MDPI. This book was released on 2018-07-10 with total page 469 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "100 Years of Chronogeometrodynamics: the Status of the Einstein's Theory of Gravitation in Its Centennial Year" that was published in Universe
Download or read book Quantum Gravity written by Domenico J. W. Giulini and published by Springer Science & Business Media. This book was released on 2003-09-16 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: The relation between quantum theory and the theory of gravitation remains one of the most outstanding unresolved issues of modern physics. According to general expectation, general relativity as well as quantum (field) theory in a fixed background spacetime cannot be fundamentally correct. Hence there should exist a broader theory comprising both in appropriate limits, i.e., quantum gravity. This book gives readers a comprehensive introduction accessible to interested non-experts to the main issues surrounding the search for quantum gravity. These issues relate to fundamental questions concerning the various formalisms of quantization; specific questions concerning concrete processes, like gravitational collapse or black-hole evaporation; and the all important question concerning the possibility of experimental tests of quantum-gravity effects.
Download or read book 20th Natural Philosophy Alliance Proceedings written by David de Hilster and published by Lulu.com. This book was released on 2013-07-03 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: Natural Philosophy Alliance published in conjunction with the 20th Annual Natural Philosophy Alliance conference.
Download or read book Unified Field Mechanics Natural Science Beyond The Veil Of Spacetime Proceedings Of The Ix Symposium Honoring Noted French Mathematical Physicist Jean pierre Vigier written by Richard L Amoroso and published by World Scientific. This book was released on 2015-09-08 with total page 621 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unified Field Mechanics, the topic of the 9th international symposium honoring noted French mathematical physicist Jean-Pierre Vigier cannot be considered highly speculative as a myopic critic might surmise. The 8th Vigier Symposium proceedings 'The Physics of Reality' should in fact be touted as a companion volume because of its dramatic theoretical Field Mechanics in additional dimensionality. Many still consider the Planck-scale zero-point field stochastic quantum foam as the 'basement of reality'. This could only be considered true under the limitations of the Copenhagen interpretation of quantum theory. As we enter the next regime of Unified Field Mechanics we now know that the energy-dependent Einstein-Minkowski manifold called spacetime has a finite radius beyond which a large-scale multiverse beckons. So far a battery of 14 experiments has been designed to falsify the model. When the 1st is successfully performed, a revolution in Natural Science will occur! This volume strengthens and expands the theoretical and experimental basis for that immanent new age.
