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The author of this history of mankind’s increasingly successful attempts to understand, to measure and to map the Earth’s gravity field (commonly known as ‘little g’ or just ‘g’) has been following in the footsteps of the pioneers, intermittently and with a variety of objectives, for more than fifty years. It is a story that begins with Galileo’s early experiments with pendulums and falling bodies, progresses through the conflicts between Hooke and Newton and culminates in the measurements that are now being made from aircraft and satellites. The spectacular increases in accuracy that have been achieved during this period provide the context, but the main focus is on the people, many of whom were notable eccentrics. Also covered are the reasons WHY these people thought their measurements would be useful, with emphasis in the later chapters on the place of ‘g’ in today’s applied geology, and on the ways in which it is providing new and spectacular visions of our planet. It is also, in part, a personal memoir that explores the parallels between the way fieldwork is being done now and the difficulties that accompanied its execution in the past. Selected topics in the mathematics of ‘g’ are discussed in a series of short Codas.
Gravity --- Measurement. --- Popular works. --- History. --- Geophysics. --- Earth. --- Geology. --- Popular Science. --- Popular Earth Science. --- Geophysics/Geodesy. --- History of Science. --- Gravimetry --- Physical geography. --- Annals --- Auxiliary sciences of history --- Geography --- Geological physics --- Terrestrial physics --- Earth sciences --- Physics --- Geognosy --- Geoscience --- Natural history --- Double pendulums --- Pendulum --- Measurement --- Bouguer, --- Brahe, Tycho, --- Galilei, Galileo, --- Hooke, Robert, --- Kepler, Johannes, --- Newton, Isaac,
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A unified quantum theory incorporating the four fundamental forces of nature is one of the major open problems in physics. The Standard Model combines electro-magnetism, the strong force and the weak force, but ignores gravity. The quantization of gravity is therefore a necessary first step to achieve a unified quantum theory. In this monograph a canonical quantization of gravity has been achieved by quantizing a geometric evolution equation resulting in a gravitational wave equation in a globally hyperbolic spacetime. Applying the technique of separation of variables we obtain eigenvalue problems for temporal and spatial self-adjoint operators where the temporal operator has a pure point spectrum with eigenvalues $lambda_i$ and related eigenfunctions, while, for the spatial operator, it is possible to find corresponding eigendistributions for each of the eigenvalues $lambda_i$, if the Cauchy hypersurface is asymptotically Euclidean or if the quantized spacetime is a black hole with a negative cosmological constant. The hyperbolic equation then has a sequence of smooth solutions which are products of temporal eigenfunctions and spatial eigendistributions. Due to this "spectral resolution" of the wave equation quantum statistics can also be applied to the quantized systems. These quantum statistical results could help to explain the nature of dark matter and dark energy. .
Quantum gravity. --- Gravity --- Standard model (Nuclear physics) --- Measurement. --- Physics. --- Mathematical physics. --- Gravitation. --- Cosmology. --- Elementary particles (Physics). --- Quantum field theory. --- Classical and Quantum Gravitation, Relativity Theory. --- Mathematical Physics. --- Elementary Particles, Quantum Field Theory. --- Gravimetry --- Gravity, Quantum --- General relativity (Physics) --- Gravitation --- Quantum theory --- Nuclear models --- Nuclear reactions --- Quantum theory. --- Quantum dynamics --- Quantum mechanics --- Quantum physics --- Physics --- Mechanics --- Thermodynamics --- Relativistic quantum field theory --- Field theory (Physics) --- Relativity (Physics) --- Elementary particles (Physics) --- High energy physics --- Nuclear particles --- Nucleons --- Nuclear physics --- Physical mathematics --- Astronomy --- Deism --- Metaphysics --- Matter --- Antigravity --- Centrifugal force --- Mathematics --- Properties
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