18 research outputs found

    Precise Measurement of Gravity Variations During a Total Solar Eclipse

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    The variations of gravity were measured with a high precision LaCoste-Romberg D gravimeter during a total solar eclipse to investigate the effect of solar eclipse on the gravitational field. The observed anomaly (7.0±2.7)×108(7.0 \pm 2.7) \times 10^{-8} m/s2^2 during the eclipse implies that there may be a shielding property of gravitation

    Role of a "Local" Cosmological Constant in Euclidean Quantum Gravity

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    In 4D non-perturbative Regge calculus a positive value of the effective cosmological constant characterizes the collapsed phase of the system. If a local term of the form S=hϵ{h1,h2,...}λhVhS'=\sum_{h \epsilon \{h_1,h_2,...\} } \lambda_h V_h is added to the gravitational action, where {h1,h2,...}\{h_1,h_2,...\} is a subset of the hinges and {λh}\{\lambda_h\} are positive constants, one expects that the volumes Vh1V_{h_1}, Vh2V_{h_2}, ... tend to collapse and that the excitations of the lattice propagating through the hinges {h1,h2,...}\{h_1,h_2,...\} are damped. We study the continuum analogue of this effect. The additional term SS' may represent the coupling of the gravitational field to an external Bose condensate.Comment: LaTex, 18 page