Newtonian mechanics as well as classical elasticity are the main analytical tools in constructing stable spacecrafts and determining its flight trajectory    . On the other hand when the travelling distance and speed are what can be described as large scale, then it becomes increasingly important to take relativistic corrections into account. By contrast quantum corrections are hardly ever needed on a realistic operational level. Contrary to the above, the present work is concerned with a situation where high energy quantum physics and cosmology as well as nonlinear dynamics and nano technology  play a fundamental role in the context of space flight with undreamed of possibilities as will transpire from our present analysis of NASA’s EM drive project     .
In what follows we hope to prove that NASA’s proposal for an EM drive is in principle possible  -  . To show that nothing could be simpler than appealing to the Heterotic superstring interpretation of dark energy and the Hawking radiation, Unruh temperature as well as Hartle-Hawking universe wave function theory as used in a few recent publications concerned with ordinary cosmic energy density and dark cosmic energy density  -  . The first, in the meantime well known, is the energy density of the quantum particle five dimensional zero set which amounts to 4.5% of the total while the rest of 95.5% is related to the quantum wave five dimensional empty set side of the universe   . This gradient is sufficient to support a fuelless EM drive enabling interstellar navigation from anywhere to eternity. In fact we need an engine for navigation only, the thrust comes naturally from the local form of one sided Casimir effect of spacetime     . There is a simple picture associated with the energy density gradient from 4.5% to 95.5%    . This picture is based on the quantum E-infinity fact that the quantum wave surrounds and guides the quantum particle, which is rather similar to the Bohm-Einstein pilot wave theory   . Applying all that to the entire universe we see that a point inside the universe could be thought of as 4.5% quantum particle energy density location while any point at the hyperbolic horizon and the holographic boundary of the universe may be regarded as the 95.5% quantum wave energy density. The same idea is expressed in a different language when we invoke Dvoretzky’s theorem and reason that 95.5% of the volume of the higher dimensional (i.e. 5D) universe of our real existence lies at a thin layer of the surface. Consequently we expect that any spaceship will be pulled from any point of the interior of the universe towards the hyperbolic boundary of the universe so that a skilful navigation technique could get it from anywhere to anywhere else and practically without expending much fuel except for navigation. This conclusion is reinforced completely by Dvoretzky’s theorem   . In short, NASA’s proposal does not violate Newton’s third law  . By self similarity  -   the preceding picture in the large can be invoked in the small and applied to the EM drive inside the spacecraft as will be discussed later on. So much for the theoretical justification of EM drive. We stress once more that our theory goes as far as saying that the thrust is inbuilt into the geometry and topology of the five dimensional vacuum of a fractal spacetime so that the motion of the spacecraft is in principle possible with or without an engine. The engine is initially there mainly to steer up, down, left and right only. Thus solving the main theoretical problem is probably 1% of the difficulties. The rest of the 99% is engineering. We note on passing and in very general terms that dark energy, Hawking vacuum fluctuation, Casimir force and the like differ only with regard to boundary conditions  . In other words, the present theory for interstellar flight is a relative of our theory for a Casimir-dark energy nano reactor   . For details of the exact calculation of dark matter energy and pure dark energy, the reader may consider Fig. 1 of Ref.  as well as the references therein. Having said all of that it is obvious to expect fro an imaginative engineering design of the EM drive to yield far more than simple steering of the spacecraft when we look upon it as something analogous to a Hawking black hole behind an event horizon so that somehow the emitted radiation could be manipulated in a way to produce the kind of thrust which does not violate Newton’s third law, even in the absence of back reaction  . Consequently it is possible that Hawking radiation could be simulated and we could in principle produce a kind of axion dark matter-like radiation to act as an EM drive thrust which can have a net resultant force pushing the spacecraft forward. Said differently our fractal self similar universe allows for two kinds of thrust, one in the large involving the spacecraft and the entire universe and one in the small involving the EM drive inside the spacecraft only.
2. Analysis Based on E-Infinity Theory Coupled to Heterotic Superstring Theory
In this section we would like to show quantitatively how a back reaction in empty spacetime can never the less create a thrust, pushing a spaceship forwards without violating conservation of momentum enshrined in Newton’s third law  . To do this we will first appeal to the fractal version of Heterotic string interpretation of the three basic cosmic energy densities, namely the ordinary (4.5%), the pure dark (73.3%) and the dark matter energy density (22.2%)      . We recall that Einstein’s maximal energy density is given via the Nikolay Umov-like equation when setting and finding the famous formula where E is the energy, m is the mass and c is the speed of light   . We start here by rewriting via the Heterotic string formalism as where we have subtracted Einstein’s spacetime dimensionality D = 4 from the transfinite bosonic superstrings maximal dimensionality and found      . Here k is given by which is ‘tHooft’s renormalon and amounts to twice the value of Hardy’s probability where      . Proceeding in this self explanatory way by writing the three terms expression given in previous publications (see for instance Equation (8) of Ref.  ) in a different context    .
we see that our exact ordinary cosmic energy density is given by the first term of Equation (1)      :
The second term in Equation (1) is clearly connected to a Kaluza-Klein quantity, namely a five dimensional object or a topological mass equal 5 so the density is approximately equal 5/22. However we notice an interesting coupling term D that will play a fundamental role in our theory and the present analysis as will shortly transpire    . The third term on the other hand is obviously connected to D. Gross et al extra bosonic dimensions of their Heterotic string theory or more accurately, the transfinite (fractal) version of the classical Heterotic theory which is found by the inclusion of the ‘tHooft entangleon k leading to and instead of the classical 26 and 22   . We see again the same D appearing but with a positive sign. Clearly and we will dwell on the annihilation of D involved which is reminiscent of but by no means identical to Hawking’s radiation at the edge of a black hole when interpreting D as an exotic virtual particle  . Again we recall that D was found to be given by and that the exact values of pure dark energy density and dark matter energy density follow from fixing this coupling term or couplion particle at this value   . On the other hand D has another remarkable interpretation when is rewritten in the form of first the difference between matter like densities, namely the dark matter energy density and the ordinary energy density as on the first line of Equation (3) and second as the difference between 5 and multiplied with the first difference as shown on the third and fourth line of the same Equation (3)      . Continuing in this admittedly not very obvious way to start with, one finds the exact energy density of dark matter and the meaning becomes more clear a posteriori, namely
exactly as it should be   . Now the same thing can be done for the pure dark energy density side involving the Gross bosons, namely     
Applying the above to the balance of forces acting on our “fuel-less” spaceship, we see that , interpreted as quasi quantum particles, can solve the problems of creating a vacuum thrust pushing the spaceship “forward” without violating fundamental conservation laws of physics   . Thus our picture in the large would entail that would be sucked by the hyperbolic horizon of pure dark energy at infinity while the gives the spaceship the needed jolt to go forward. From the preceding picture in the large we can see that by self similarity   the suggestion in the small to regard the EM drive devise as analogous to a small black hole emitting a special type of Hawking axion-dark matter radiation is not outlandish and makes a great deal of sense  -  . We know for instance of an instructive analogy between phonons and the speed of sound on one side and photons and the speed of light on the other side which means that event horizon and its radiation are indeed not unique to black holes and may thus be drawn as we did here to explain NASA’s EM drive  .
The preceding interpretation could also be formulated using a lower dimensionality theory, namely that of a fractal Kaluza-Klein   . In this case we would have the same exact densities
However the coupling D changes to and the plus and minus are exchanged. This exchange of signs is harmless because in an infinite spacetime manifold plus and minus as well as up and down or left and right are all conventions and nothing more than that. At the end all what matters is that and we have the vacuum thrust, which does not violate conservation of momentum  . However we see that not even Newton’s third law could not be blindly applied when it comes to the empty set vacuum  -  and the two types of dark energy, i.e. dark matter energy and pure dark energy  . In the preceding analysis we made a tacit use of the Cantorian interpretation of vacuum fluctuation as well as a generalized conception of Hawking radiation without giving any details which we do however in a condensed form in the Appendix at the end of the present paper. Two more clarification remarks are in order at this point. First the geometrical shape of the EM drive should not rotationally symmetric in order that there can be one direction for the resultant of all the forces exerted by the Hawking-like radiation thrust. Second the magnitude of the energy density corresponding to D is clearly around D/22 which is by far smaller than the ordinary energy density of 1/22 and the dark matter energy density 5/22.
From the preceding analysis and discussion we come to the following general conclusion: when a classical mechanics design seems to violate Newtonian principles and yet we can see clearly from the experimental set up that it works, then it is surely not a classical mechanics problem and a deeper look is required to see quantum mechanical roots to it or at a minimum to realize that some nonlinear dynamics, chaos and fractals are probably involved on a fundamental level   -  .
Our present conclusion and resolution is the following: The quantum topology of our universe dictates that it is made up of two parts, a) a low density interior with 4.5% energy density and b) a high energy density surface with 95.5% of the total energy. This gradient is in the large what makes fuelless interstellar journeys possible so that we can state without any doubt that in principle EM drive is science and not science fiction any more. On the other hand any ordinary EM engine can be used because it is needed for navigation only. However to enhance the local cosmic thrust it may be possible by invoking self similarity  in the small, to design an EM drive which does exactly that along the lines explained in the analysis of Section 2 as well as the Appendix of the present work. On the other hand, the work which is concerned mainly with the engineering aspects of the present problem is in progress and we hope to communicate it in the very near future.
We give in this appendix in a very condensed form an account of the Cantorian interpretation of quantum vacuum fluctuation as well as the generalization of Hawking radiation  as linked to the idea of axion holoscope theory of dark matter energy  . Let us recall that the Hausdorff dimension of the core of E-infinity which models our real spacetime is given by . The inverse is what we call universal fluctuation and may be understood as the surface of the empty set    . In other words, is a normed probability to find a Cantorian point in the Cantorian spacetime manifold while which we call the Hausdorff dimension, may be understood as an un-normed probability    . Now such a probability could be produced by union or intersections at two different points, say P1 and P2 when it is dissected to multiplied with where is the empty set quantum wave and is the zero set quantum particle  . Seen that way two at the two different points P1 and P2 intersect and give us Unruh temperature while the two zero sets and intersect and give us the empty set Aether  -  . This process takes place all the time and everywhere in our spacetime manifold leading to the sizzling process which we call volume fluctuation. Now similar to the edge of a black hole two different zero set particles, say and behave in an analogous way to Hawking’s radiation scenario  at an electromagnetic cavity  representing the exhaust of NASA’s ED-drive  . Continuing the preceding picture to its ultimate logical conclusion, we arrive at the remarkable axion dark matter experiment (ADMX) which was introduced in physics around 1983 by Pierre Sikivie to explain dark matter energy  long before thinking about any fuelless ED-drive spacecraft. Consequently we could regard as a Hawking particle sucked into the cavity while the is the other Hawking particle which escapes from the exhaust as radiation giving the spacecraft the thrust which was measured in various experiments mentioned in the relevant literature     . In short NASA’s EM drive is analogous to Hawking’s black hole which, as we stressed earlier on, is not surprising because an even horizon is not unique to black holes and there are well known experiments in which something resembling Hawking radiation is produced without a real black hole using laboratory simulations  . In the preceding picture we considered the thrust, produces on the small scale by means of the EM drive devise. However by self similarity  , the same picture holds on the large scale involving the entire universe. In other words our spacecraft is acted upon by two reactionless thrusts. The first is due to the large scale structure of the entire expanding universe and the second is by self similarity due to the forces produced on the much smaller scale by the EM drive.