[en] We deal with the possibility to establish a relation between the self-interaction effect of ν(x) fields, which, in essence, leads to the appearance and the non-local and partial local neutrino-gravitational interaction, introduced by the author. (author)

[en] The results are given of detailed UBV photometry of the peculiar galaxy NGC 2685 based on 10 negatives obtained with the 2.6-m telescope of the Biurakan Observatory. Consideration of all the available observational data (photometric, spectroscopic, and polarization) suggests that NGC 2685 is a pair of colliding galaxies. 18 references

[en] Using a lagrangian formalism of invariantive mechanics the deviation of the light in a gravitational field is studied; the result is in full agreement with the theory of General Relativity. (author)

[en] It is argued that the tetrad in a recent paper by Porto and Rothstein on gravitational spin-spin coupling should not have the given form. The fixation of that tetrad was suggested by Steinhoff, Hergt, and Schaefer as a possible source for the disagreement found in the spin-squared dynamics. However, this inconsistency will only show up in the next-to-leading order spin-orbit dynamics and not in the spin-squared dynamics. Instead, the disagreement found at the next-to-leading order spin-squared level is due to a sign typo in the spin-squared paper by Porto and Rothstein.

[en] Abstract only

[en] The complex mass term of a quark does not violate time reversal or parity in gravitational interactions, in spite of an axial anomaly.

[en] The techniques described in an earlier paper were used to determine masses of 104 asteroids by the method of asteroid-asteroid gravitational interaction. For each of the 104 perturbers, 4 large sets of test particles selected by different criteria were used to calculate 4 mass values from a weighted mean of individual results within each set. The sheer number of test particles and observations ameliorates the effects of random observational errors and the type of systematic errors known to have affected specific observatories at specific times. It also reduces the effect of mismodeled attractions by perturbers other than the one being estimated, because the various test particles are affected to different degrees and in different directions. For most of the perturbers that have been analyzed by others, the results of this study agree reasonably well with values published in the past decade, giving credence to the approach. Thirty-eight of the results appear to be the first published masses for the respective asteroids, and 12 are the first determinations based on asteroid-asteroid interactions. Unrealistic and/or negative masses were obtained for some perturbers. Causes for this phenomenon are discussed and various means to obtain reasonable numbers are evaluated.

[en] Scattering involving very high energies in gravitational systems is discussed. The different origins of the non-leading contributions to the scattering amplitude are briefly reviewed. 6 refs, 2 figs

[en] Two recent experiments searching for a composition-dependent force are briefly explained. To have a consistent understanding of these and other experiments an attempt is made by allowing a coupling of the force to the lepton number as well. (author)

[en] It has never been directly experimentally demonstrated that antimatter is gravitationally attracted to matter. We discuss the theoretical and experimental situation, and propose a new experiment using antiprotons. (orig.)