Reply to Winterberg's article on the detectability of gravitational waves.
Gravitational fields effects on light intensity related to detectability of gravitational waves by starlight scintillation measurement
Bertotti, B.↗
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Canonical quantization of gravitational field.
Canonical quantization of gravitational field in Einstein gravitational theory by scalar field coordinates and canonical variables
Peres, A.↗
Computer solutions of the gravitational n-body problem.
Computer study of collisionless self gravitating system using two dimensional model, obtaining gravitational field by solving Poisson equation
Hohl, F.↗
Gravitational lens simulator.
Simulated gravitational lens made of Plexiglass for demonstrating stellar gravitational lens phenomena, presenting partial cross section
Liebes, S., Jr.↗
Measuring the gravitational interaction of elementary particles
Elementary particles gravitational interactions, identifying tensor field with local gravitation
Beall, E. F.↗
Studies of space experiments to measure gravitational constant variations and the Eotvos ratio
Detecting variations of gravitational constant difference between inertial and passive gravitational mass
Wilk, L. S.↗
Analysis of an experiment to determine the gravitational constant in an orbiting space laboratory
Experimental determination of gravitational constant in orbiting space laboratory by gravitational centrifugal balance of test objects
Vinti, J. P.↗
Tests of the equivalence principle and gravitation theory using solar system bodies
The M sub g/M sub i ratio (ratio of body acceleration to gravitation field) of celestial bodies was measured. Deep probes of the post-Newtonian structure of gravitational theories are indicated. Kepler's third law is considered for the Sun-Jupiter system.
Nordtvedt, K., Jr.↗
A low temperature gravitational radiation detector
The beginning design of an experiment is discussed for studying gravitational radiation by using massive detectors which are cooled to ultralow temperatures in order to improve the signal to noise ratios and the effective range and stability of the detectors. The gravitational detector, a low detection system, a cooled detector, magnetic support, superconducting shielding, and superconducting accelerometer detector are described.
Hamilton, W. O.↗
Properties of hollow square gravitational wave detectors
Antennas are described with gravitational radiation properties such as polarization, directivity, and scalar and tensor characteristics. These antenna devices are mechanically resonant systems in the shape of a hollow square with fundamental frequencies in the Hz range. An antenna characteristic is that the absorption cross section for quadrupole radiation at the normal frequency of vibration is the same as that of the fundamental if the damping factors are the same. The absorption cross section of quadrupole gravitational radiation is calculated for a class-1 detector of a cylindrical cross section and for a class-2 detector shaped like a hollow square.
Douglass, D. H., Jr.↗
On the heterodyne method of detecting gravitational waves
A mathematical model on the heterodyne method of detecting gravitational waves is presented, using a dumbbell consisting of two masses situated in a plane and a plane-fronted gravitational wave traveling perpendicular to the plane. It is concluded that the detector sensitivity is not likely to be improved without employing very complicated and expensive super low temperature techniques.
Braginsky, V. B.↗
ESRO study program for a space experiment on gravitation theories
ESRO is considering a space experiment which is the definition phase. A more complete utilization of space techniques, leading to highly accurate acceleration measurements in a heliocentric spacecraft, together with an improved laser signal propagation method (using a space-borne atomic clock), could substantially increase the validity of the gravitational time delay test during solar conjunction. Preliminary investigations of the primary required techniques were carried out. These studies included an orbit analysis, investigation of drag-free techniques, and studies of the time measuring instrument. These studies were used to define the framework of a space experiment on gravitation theories. A preliminary feasibility study of the mission is being undertaken.
Israel, G. M.↗
Gravitational-wave astronomy
The significance of experimental evidence for gravitational waves is considered for astronomy. Properties, generation, and astrophysical sources of the waves are discussed. Gravitational wave receivers and antennas are described. A review of the Weber experiment is presented.
Press, W. H.↗
Gravitation research
Balloon measurements were made of the far infrared background radiation. The radiometer used and its calibration are discussed. An electromagnetically coupled broadband gravitational antenna is also considered. The proposed antenna design and noise sources in the antenna are reviewed. A comparison is made between interferometric broadband and resonant bar antennas for the detection of gravitational wave pulses.
Weiss, R.↗
Interpretation of gravitational-wave observations.
Weber's (1971) interpretation of his observations involving a source at the center of the Galaxy isotropically radiating in the form of gravitational waves is discussed. The gravitational-wave flux at the earth is presumed to be that indicated by Weber's experiments, and directions are suggested in which more satisfactory theories of the source can be sought.
Misner, C. W.↗
Possible variation of the gravitational constant over the elements.
We re-examine the theory and data of the Kreuzer experiment to measure the relative difference in the gravitational constant between two elements. Significant errors appear in the statistical analysis of Kreuzer which vitiate his conclusions. The upper bound for the relative difference of F and Br from his experimental data correctly becomes .02, about 10 times the limit already set on the general variation of the gravitational constant over the elements by direct use of a Cavendish balance.
Gilvarry, J. J.↗
Theory of an experiment in an orbiting space laboratory to determine the gravitational constant.
An experiment is discussed for determining the gravitational constant with the aid of an isolated system consisting of an artificial satellite moving around an artificial planet. The experiment is to be conducted in a spherical laboratory traveling in an orbit around the earth. Difficulties due to the gravity-gradient term are considered, and the three-tunnel method proposed by Wilk (1969) is examined. The rotation of the sphere is discussed together with aspects of the reference systems used, the equations of motion of the spacecraft and of the test objects, the field from the earth's gravity gradient at the test object, higher harmonic terms in the gravity gradient force, gravitational effects of the spacecraft itself, and a computer simulation.
Vinti, J. P.↗
Polarization of gravitational synchrotron radiation.
Development of a method of analysis of gravitational polarization in terms of Stokes parameters similar to those used for the electromagnetic case. Analytical expressions for these parameters are obtained for the gravitational synchrotron radiation corresponding to the Schwarzschild black-hole model. It is shown that interference between odd- and even-parity terms makes a significant contribution to the angular dependence of the polarization.
Breuer, R. A.↗