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Author: Stuart Alan Jarvis
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Stuart Alan Jarvis
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Ephraim Fischbach
Publisher: Springer Science & Business Media
ISBN: 1461214386
Category : Science
Languages : en
Pages : 313
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Book Description
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.
Author: Bruno Hubler
Publisher:
ISBN:
Category :
Languages : en
Pages : 52
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Author: David P. Rubincam
Publisher:
ISBN:
Category : Gravity
Languages : en
Pages : 16
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Author: Andrew A. Geraci
Publisher:
ISBN: 9780549060581
Category :
Languages : en
Pages : 150
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Book Description
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.
Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781792704260
Category :
Languages : en
Pages : 26
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Book Description
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 ...
Author: Y.-T. Chen
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Orrin Fackler
Publisher: Atlantica Séguier Frontières
ISBN: 9782863320464
Category : Astronomy
Languages : en
Pages : 688
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Book Description
Author: Allan Franklin
Publisher: Morgan & Claypool Publishers
ISBN: 1643277383
Category : Science
Languages : en
Pages : 185
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Book Description
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.
Author: Sabine Hossenfelder
Publisher: Springer
ISBN: 3319645374
Category : Science
Languages : en
Pages : 121
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Book Description
This book summarizes recent developments in the research area of quantum gravity phenomenology. A series of short and nontechnical essays lays out the prospects of various experimental possibilities and their current status. Finding observational evidence for the quantization of space-time was long thought impossible. In the last decade however, new experimental design and technological advances have changed the research landscape and opened new perspectives on quantum gravity. Formerly dominated by purely theoretical constructions, quantum gravity now has a lively phenomenology to offer. From high precision measurements using macroscopic quantum oscillators to new analysis methods of the cosmic microwave background, no stone is being left unturned in the experimental search for quantum gravity. This book sheds new light on the connection of astroparticle physics with the quantum gravity problem. Gravitational waves and their detection are covered. It illustrates findings from the interconnection between general relativity, black holes and Planck stars. Finally, the return on investment in quantum-gravitation research is illuminated. The book is intended for graduate students and researchers entering the field.
