Experimental Confirmation of the Gravitation Force Negative Temperature Dependence

The problem of influence of bodies’ temperature on the force of their gravitational interaction has been discussed since long ago and the first precision experiments in this field were already carried out at the beginning of the XXth century [1]. The decline of interest to such researches, which followed later, might be explained by the authority of the general theory of relativity according to which the temperature dependence of force of gravitation practically can not be observed [2]. The next stage of experimental studies of the said specified problem fell to the beginning of the current millenium when in Russia there were published the results of laboratory measurements of temperature dependence of weight of metal bars, indicating an appreciable negative temperature dependence of the gravitation forces [3-5]; recently these results were confirmed in works of Chinese scientists [6].

The physical substantiation of relatively strong influence of temperature on force of gravitation consists in deep interrelation of electromagnetic and gravitational interactions, and their dependence on the accelerated movement of the microparticles forming a massive body, with intensity growing with growth of temperature [7,8]. In experiments [3,6], the weighed samples were heated up to comparatively high temperatures - from ten degrees up to hundreds.

A possible, in such conditions, influence on results of measurements of the thermal air convection, the change of temperature of the scales mechanism, the thermal change of residual magnetization and adsorption of moisture on the surface of samples, and so on – naturally caused caution and even mistrust in estimations of the obtained results. Meanwhile, the results of weighing the heated metal samples were obtained at high enough levels of an effective signal to noise ratio, with the careful account for the influence of the mentioned factors.

The design of the weighed container is shown in Fig. 1.

Fig. 1. The arrangement of container. 1- body, 2 – base, 3 – laying, 4 – PZT-pile, 5 – cover, 6 – hanging bar.

The container was placed in the closed box of analytical scales, the high-frequency electric signal was fed to electrodes of piezoelectric ceramics by means of elastic copper conductors 85µm in diameter and 150mm in length. The weighed sample is made in form of three "piles" ("sandwiches") of parallel-connected piezoelectric ceramic rings, 5 rings in each "pile", fixed on the massive brass base; the external diameter of rings is 22 mm, the internal diameter is 16 mm, height is 6 mm; the full weight of 15 rings is equal to 112.9g. In parallel to the power supply terminals of piezoelectric ceramics, there was connected the variable inductance for adjustment of resonance frequency of the supplied signal equal to 389 kHz, which allows to achieve the most effective heating of samples; the amplitude of the resonance signal is equal to 40 V. The readout of scales was carried out by the elongation method with the period of scale beam oscillations equal to 19.7 s. At full weight of the container equal to about 470 g, the error in reading out the changes of weight in time did not exceed 30 mcg.

An example of typical experimental time dependence of the container weight change is shown in Fig. 2.

Fig. 2. Experimental time-dependence of container mass by heating PZT-pile from 24.0 till

25.6 ⁰C. Touch lines is “in” and “out” moments. 1 period = 19.7 s.

According to Fig. 2, the relative temperature change of piezoelectric ceramics weight by 1 degree,

,

is equal to .

This value is close to value for a lead sample, , obtained in [3].

Let's note that close conformity of measurement results is realized with essentially different dimensions and configurations of the samples and containers which were used.

[3,6]. The further experimental researches of negative temperature dependence of force of the gravitation, carried out with use of various samples of materials in a wide range of temperatures, will promote the progressive development of physics of gravitation

1. P. E. Shaw and N. Davy The Effect of Temperature on the Gravitative Attraction, Phys. Rev. 21 (6), 680 (1923)
2. A. K. T. Assis and R. A. Clemente The Influence of Temperature on Gravitation Nuovo Cimento, Vol. 108 B, No. 6, 713 (1993)
3. A. L. Dmitriev, E. M. Nikushchenko and V. S. Snegov Influence of the Temperature of a Body on its Weight, Measurement Techniques, Vol. 46, No. 2, 115 (2003)
4. A. L. Dmitriev Experimental Study of Gravity Force Temperature Dependence, 18^th International Conference on General Relativity and Gravitation (GRG18), Abstract Book, 77 (2007)
5. A. L. Dmitriev Measurements of the Influence of Acceleration and Temperature of Bodies on their Weight, AIP Conf. Proc. 969, 1163 (2008)
6. Liangzao Fan, Jinsong Feng and Wuqing Liu An Experimental Discovery about Gravitational Force Changes in Materials due to Temperature Variation, Engineering Sciences, China 12 (2), 9 (2010)
7. A. L. Dmitriev On the Influence of External Elastic (Electromagnetic) Forces on the Gravity Russian Physics Journal, Vol. 44, No. 12, 1323 (2001)
8. A. L. Dmitriev Analogue of the Lenz’s Rule in Phenomenological Gravitation, AIP Conf. Proc. 1103, 345 (2009)