Many recent highly precise and unmistakable observational facts achieved thanks to the tightly synchronized clocks of the GPS, provide consistent evidence that the gravitational fields are created by velocity fields of real space itself, a vigorous and very stable quantum fluid like spatial medium, the same space that rules the propagation of light and the inertial motion of matter. It is shown that motion of this real space in the ordinary three dimensions round the Earth, round the Sun and round the galactic centers throughout the universe, according to velocity fields closely consistent with the local main astronomical motions, correctly induces the gravitational dynamics observed within these gravitational fields. In this spacedynamics the astronomical bodies all closely rest with respect to the real space, which forthrightly leads to the observed null results of the Michelson light anisotropy experiments as well as to the absence of effects of the solar and galactic gravitational fields on the rate of clocks moving with Earth as recently discovered with the help of the GPS clocks. This spacedynamics exempts us from explaining the circular orbital motions of the planets round the Sun, likewise the rotation of Earth exempted people from explaining the diurnal transit of the heavens in the days of Copernicus and Galileo, because it is space itself that so moves. This spacedynamics also eliminates the need of dark matter and dark energy to explain respectively the galactic gravitational dynamics and the accelerated expansion of the universe. It also straightforwardly accounts in terms of well known and genuine physical effects for all the other observed effects, caused by the gravitational fields on the velocity of light and on the rate of clocks, including all the new effects recently discovered with the help of the GPS. It moreover simulates the non-Euclidean metric underlying Einstein's spacetime curvature. This spacedynamics is the crucial innovation in the current world conception that definitively resolves all at once the troubles afflicting the current theories of space and gravitation.

The first-principles discrete variational method is employed to investigate the electronic structure and local magnetic properties of disordered Fe-V alloys. The spin-polarized case is considered in the formalism of the local-spin-density approximation, with the exchange-correlation term of von Barth-Hedin. The effect on the local magnetic properties of adding V atoms in the immediate neighborhood of iron atoms is investigated. The partial density of states, hyperfine field (H c ), magnetic moment (), and isomer shift are obtained for the central atom of the cluster. For the impurity V atom in the bcc iron host the calculated values for H c and are Ϫ203 kG and Ϫ0.86 B , respectively. The isolated Fe atom in a bcc vanadium host exhibits a collapsed moment and acts as a receptor for electrons. In ordered alloys the calculations indicate also a vanishing moment at iron sites. ͓S0163-1829͑98͒05901-3͔

The magnetic hyperfine field (mhf) acting on a 181 Ta probe dilutely substituted at the non-magnetic transition element site has been investigated for the pseudo-quaternary Heusler alloys Co 2 Ti 1−x Nb x Al, Co 2 Ti 1−x V x Al, Co 2 Ti 1−x V x Sn, and Co 2 V 1−x Cr x Al with x = 0.2, 0.4, 0.6 and 0.8 by TDPAC measurements utilizing the 133-482 keV gammagamma cascade in 181 Ta following the β −-decay of 181 Hf. Magnetization measurements on Co 2 Ti 1−x (Nb, V) x Al samples were carried out by using a vibrating-sample magnetometer. The Curie temperature and the saturation magnetization were obtained for each alloy. The lattice parameters of the alloys were determined by x-ray diffraction measurements. The results for the mhf acting on Ta occupying the non-magnetic transition element site are discussed and compared with the mhf systematics for the cobalt-based Heusler alloys.

The present work breaks the endless impasse of the current theories with space and gravitation, proposing a completely new conception in which the quantum space, ruling the propagarion of light and the inertial motion of matter, moves according to a velocity field consistent with the local main astronomical motions. This solution is clearly suggested by recent clear-cut experimental observations, achieved with the help of the GPS and also is implicit in the Quantum Field Theory (QFT) underlying the Standard Elementary Particle Model (SEPM). In a first part (Section II) it is shown that these recent experimental observations demonstrate that real space, the one that rules the propagation of light and the inertial motion of matter, is moving round each gravitational source according to a Keplerian velocity field consistent with the local main astronomical motions. This is the crucial experimental fundamentation of the spacedynamics that appropriately produces the observed gravitational dynamics on earth, in the solar system and also the galactic gravitational dynamics without the need of dark matter as well as all the observed effects of the gravitational fields on the propagation of light and on the rate of clocks. In a second part (Section III) it is shown how this spacedynamics arises within the context of the QFT underlying the SEPM. The QFT entails the idea that space is filled up with a scalar quantum field, a Bose-Einstein condensate of Higgs bosons. This Higgs condensate is a quantum fluid, responsible for giving mass to the elementary particles by the Higgs mechanism providing them with mechanical properties. This lets clear that the Higgs condensate plays the role of real quantum space that rules the propagation of light and the inertial motion of matter and is the ultimate reference for rest and for motion of matter and light. Therefore, on moving according to a Keplerian velocity field, this condensate causes the observed gravitational dynamics as well as all the other observed effects caused by the gravitational fields.