Biefeld-Brown’s [1-6] effect has been known since 1928. Christensen and Møller [7] built a Biefeld-Brown electrode setup and published measurements of the obtained thrust in ambient air. They also compared their results with theoretical predictions of electric wind effects. The agreement was very good and tended to explain the Biefeld-Brown effect as a purely electric wind phenomenon. The other try to verify the adequacy of BiefeldBrown effect with electric wind phenomena was made by Tajmar [8]. The author concluded in this article that electric wind phenomena can explain Biefeld-Brown effect. The results [8] suggest that corona wind effects were misinterpreted as a possible connection between gravitation and electromagnetism. Brown observed in [9] that thiseffect remained even if the ambient medium was a vacuum (up to 10⁻⁶ Torr). Talley [10,11] studied Brown’s electrode configurations in vacuum chambers up to 10⁻⁶ Torrin great detail. He found no thrust in the case of a static dc potential applied to the electrodes. However, he noticed an anomalous force during electrical breakdowns when the current was flowing. This force, the result of currents in divergent electric fields (due to the asymmetrical electrode configuration) finds further support in five-dimensional theories coupling the gravitational and electromagnetic field. Williams [12] integrated amass dependent fifth dimension into the relativistic Maxwell theory and predicted the coupling between both fields. The newest references of investigations of electrodynamic lifter propulsion could be found in [13]. However, ambiguity of explanation of Biefeld-Brown effect indicates that new theoretical and experimental researches are needed.

Suppose that the full action of the theory is given by the Einstein-Hilbert [14] term plus a term describing any matter fields appearing in the theory

The action principle then tells us that the variation of this action with respect to the inverse metric is zero, yielding

Since this equation should hold for any variation δg^μν, it implies that

this equation of motion for the metric field could be found. The calculation of the left hand side of the equation for the variations of the Ricci scalar R and the determinant of the metric could be found in Carroll [15]. After having of all the necessary variations at our disposal, we can insert them into the equation of motion for the metric field to obtain

which is Einstein’s field equation [16,17] and constant

has been chosen so that the non-relativistic limit yields the usual form of Newton’s gravity law, where is the gravitational constant and is speed of light in vacuum. The right hand side of this equation is (by definition) proportional to the energy-stress tensor

The Lagrangian of mater must be chosen so, that it satisfy conservation lows.

The electromagnetic tensor in Cartesian coordinates is commonly written as a matrix:

or

where is the electric field, the magnetic field, and the speed of light. The signs in the tensor above depend on the convention used for the metric tensor. The convention used here is, corresponding to the metric tensor:

From the matrix form of the field tensor, it becomes clear that the electromagnetic tensor satisfies the following antisymmetry properties F^ab = F^ba (hence the name bi vector) of six independent components.

If one forms an inner product of the field strength tensor Lorentz invariant is formed:

the Lagrangian of electromagnetic field in our model could be

Lagrangian differs from classic electromagnetic field Lagrangian just with constant α_gc², where α_g is electromagnetic field gravity constant with dimension s²/m², which could be calibrated on experiment data.

According to [18], it is safer to rewrite inner product of field strength tensor as F_abF_cdg^acg^bd. This gives for the first term of sum of energy-stress tensor Equation (6).

A different result could be obtained, if inner product of field strength tensor is leaving as F_abF^ab. In this way result is:

Let’s decide, that Equation (13) is true (discussion in Appendix), so the calculations of energy-stress tensor term of electromagnetic field give result:

which is symmetric and satisfy rotation conservation low.

According to Equation (6) energy-stress tensor of gravity mass in electromagnetic field could be found with adding Lagrangian of gravitational and electromagnetic parts of Lagrangian

After inserting of energy-stress tensor of Equation (15) into Equation (4) Einstein-Hilbert field equation looks like this

Taking the trace of Equation (16) (contracting with g_μν) and using the fact that g^μνg_μν = 4, we get for space curvature:

yielding the equivalent form of Equation (16)

Space curvature Equation (17) of spheric gravity mass with radius r in electromagnetic field could be rewritten as

where M_eg is electromagnetic mass and is volume of electromagnetic field and is equal to volume of devices, which is inside this electromagnetic field.

From Equation (19) assumption could be made, that summary curvature of the space generated by gravity mass should decrease in electric field and increase in magnetic field. If the mass of device M equals to absolute value of electromagnetic mass |M_eg|, zero curvature of such device could be obtained, so gravity mass of this device stop interacting with the other gravity mass. Let’s prove it analytically.

The solution of Equation (19) in spheric coordinates (see for example [19]) is:

where Λ equals to

Thus, the gravitational potential of a point mass is

Equation (26) prove proposition, if the mass M equals to absolute value of |M_eg|, we have zero gravitational gravity potential for gravity mass M and so such mass does not interact with external gravity field.

Replacing of magnetic field B with B = 0 and replacing of electric field density with capacitor energy density multiplied by volume of electric field of capacitor in Equation (20) gives for electro gravity mass of capacitor

The simple capacitor of two parallel conductive plates describes as

so Equation (27) could be rewritten as:

where ε is relative permittivity of material, ε₀ is absolute permittivity of vacuum, S is the area of the capacitor and d is separation of the planes of the capacitor. Equation (29) explains all experimental data observed BiefeldBrown effect. The effect depends on the separation of the plates of the capacitor, the closer the plates, the greater the effect. The effect depends on the dielectric strength of the material between the electrodes, the higher the strength, the greater the effect. The effect depends on the area of the conductor, the greater the area, the greater the effect. The effect depends on the voltage difference between the plates, the greater the voltage, the greater effect. The effect depends on the volume of the dielectric material, the greater the volume, the greater part of electromagnetic energy concentrates in dielectric material, the greater the effect.

Electro-gravity constant α_g could be found from Buehler [20] experiments. Author founds in their experiments with capacitor isolated from electronic wind, that lifting force of charged capacitor depends on energy of this capacitor is

where ΔF is lifting force, m is device mass, M mass of earth, R earth radius and constant k equals to. The inserting of numeric values of given constants into Equation (30) results for numeric value of electro-gravity constant α_g = 0.0479.

Lagrangian Equation (11) isn’t Gauge invariant and after adding of J^μA_μ term new lagrangian

satisfy electromagnetic field’s equations of motion

where J^μ is the four-current is the contravariant fourvector which combines electric current and electric charge density as follows

and is the electromagnetic four-potential is a covariant four-vector containing the electric potential and magnetic vector potential, as follows

So Equation (15) must be rewritten as follow

and Equation (20) transforms into

Equation (36) shows, that electromagnetic propulsion lifter acquire antigravity property through gravity shielding of A·J member, which describe ionic wind.

If do not zero space curvature of electric field explains Biefeld-Brown effect excellently, the same effect, but with increasing of device mass, must be observed in a magnetic field. Analogically to Equation (29) electrogravity mass equation for inductance coil looks like this

where L is the inductance, which depends on area and amount of windings and coil length, and I is the current. Equation (37) predict similar effects, observed in BiefeldBrown experiments with a capacitor, but in opposite direction of changing of coil mass: for the fixed inductance L increasing of current in coil must increase mass of the coil.

On the basis of the results obtained in this work the following conclusions have been made:

1) Electro gravity mass equation is in good agreement with Biefeld-Brown effect and fully explains all qualitative data observed in this effect;

2) Electromagnetic gravity model predicts decreasing of gravity mass effect in electric field and increasing of gravity mass in magnetic field;

3) Electromagnetic field gravity constant equals to α_g = 0.0479 [s²/m²] and is the basic constant of proposed electromagnetic gravity model;

4) The total curvature of electromagnetic wave is zero, but separate curvatures of electric and magnetic components of the wave haven’t zero values.

I’d like to thank Gintaras Valiulis from Vilnius University and Algis Dziugys from Lithuanian Energy Institute for discussions and notes, which helps definitely understand problem of new proposed electro-gravity model.

According to [21] energy-stress tensor T^ik of electromagnetic field could be derived from action principle

Variation of given action and determination it to zero leads to equation

where

Equation (39) is equivalent to proposition, that it is obtained conservation low of 4-momentum vector Pⁱ

where integration is making in all hyperplane. Description of T^ik, grounded on Equation (41) is ambiguous, because every tensor described as

meets conservation low Equation (39). Trace of given energy-stress tensor with additional term

generally isn’t zero and must be calibrated with experiment.

The other rotational momentum conservation low specify energy-stress tensor to be symmetric

and it could be reached with choosing of Ψ^ikl.

Now all this could be used to get T^ik for Lagrangian of electromagnetic field

which gives

where F_kl is described as

Tensor in Equation (46) isn’t symmetric. The trace calculation of energy-stress tensors Equation (46) gives

which is true in electromagnetic field without charge, because δF^il/δx_i. Equation (48) satisfy Equation (43) transformation and finally the last equation could be rewritten as

On the other hand symmetrization of for indexes could be reached, if the term would be added

It could be made too, because it is Equation (42) transformation. The result of following transformations is new symmetric tensor

Transformations Equation (50) applied to whole tensor change both not diagonal elements and diagonal elements of energy-stress tensor, which trace after transformation become zero

The answer to this question, which Equation (49) or Equation (52) is true, could be given just by experiments in a pure electric and magnetic fields. If gravity mass do not interact in both pure electric and magnetic fields, we must leave energy-stress tensor trace zero equality axiom. If interaction of gravity mass and pure electric and magnetic fields exist, there is sample explanation of this interaction within assumption of not zero trace of energystress tensor.