Historical research guide · 0361 · 2019
Extraction of Zero-Point Energy from the Vacuum: Assessment of Stochastic Electrodynamics-Based Approach as Compared to Other Methods
Garret Moddel · Olga Dmitriyeva
In one minute
Garret Moddel and Olga Dmitriyeva, at the University of Colorado Boulder, sort every published proposal for drawing power from the vacuum into three families and ask which ones thermodynamics allows. Rectifying the zero-point field with a diode, or with an antenna feeding a diode, is the first family, and Moddel argues it fails: the field sits in true equilibrium, so every flow of energy out is matched by a flow back — detailed balance. Squeezing energy from Casimir plates cycled open and closed is the second, and it fails too, because the Casimir force is conservative and the cycle must repay whatever it gains. The third family survives the test. Pump gas atoms through cavities narrow enough to block the vacuum modes their electron orbits ride on, and stochastic electrodynamics predicts the orbits drop, shed the difference as radiation, and are recharged by the ambient field on the way out. Their own experiment measured real radiation from that gas flow — about a thousand times weaker than predicted.
Connection
Chapter 6 asks whether a vacuum power device is possible, and this is the paper that makes the question answerable rather than rhetorical: the field’s most careful map of which routes are closed and exactly why, written by one of the people building the hardware. It also states the opening the surviving route runs through — the zero-point energy density depends on local geometry, so two vacuum regions at different densities can touch and still be in equilibrium, which is what a Casimir cavity is and what no pair of thermal reservoirs can ever be.
From the source
Zero-point energy is a state of true thermodynamic equilibrium, so detailed balance applies to it: no nonlinear process — a diode rectifying zero-point noise, or a resonant-sphere down-converter feeding an antenna and diode — can draw net power from it, because each of the three steps of such a system is separately bound by a detailed balance of rates.Sections 2.1, 2.1.1 and 2.1.2; Figures 1, 2 and 3
The Casimir force is conservative, so any engine that gains energy by letting the plates come together must spend at least as much restoring the gap, whatever mechanism it uses to switch the reflectivity — draining charge, or hydrogenating a mirror. Cyclic mechanical extraction from Casimir cavities cannot produce continuous power.Sections 2.2, 2.2.1 and 2.2.2; Figures 4 and 5; Scandurra’s analysis cited in the text
Zero-point energy differs from heat in one decisive way: its equilibrium energy density is a function of the local geometry and boundary conditions, so two zero-point reservoirs of different energy density can be in direct contact and still be in equilibrium — a Casimir cavity open at its edges to the free space around it — where two thermal reservoirs at different temperatures never can.Section 2.3.1; Conclusions
The third route survives the thermodynamic test. Under stochastic electrodynamics an electron orbit is held up by a balance of emission and absorption of vacuum energy, so a cavity narrow enough to suppress the modes that support a given orbital should lower its energy inside; the Haisch and Moddel patent pumps gas through such cavities, extracts the radiated difference at an absorber, and lets the ambient field recharge the orbitals on exit — estimated at roughly 1 kilowatt from a toaster-sized system running about ten to the twenty-second transitions per second, for pumping power well under 1 watt.Sections 2.3.1 and 2.3.2; Figure 6
The experiment measured real radiation from four gases flowing through gold-coated and uncoated nanopore membranes of 0.1, 0.2 and 0.4 micrometre pore size, and eliminated three mundane sources: the Joule-Thomson effect, whose lock-in phase was inverted and indicated cooling; turbulence, ruled out by a Reynolds number far below threshold at flows under 2 centimetres per second; and absorption or adsorption, ruled out because the signal did not scale with membrane surface area. Frictional heating is disfavoured, since the gas ordering and the linear rather than quadratic flow dependence both come out wrong, but the authors do not rule it out entirely.Sections 2.3.3 to 2.3.7; Figures 8 to 12
The measured power stayed below 1 microwatt for every gas and sample, about three orders of magnitude below the stochastic-electrodynamics prediction, which the authors attribute in part to pore shapes far from uniform; they call the result tantalising but inconclusive and close by saying that either constraints beyond those discussed preclude extraction, or it is feasible and a suitable technology has yet to be found. The next measurements they name are nanopores of consistent size and shape, imaging the radiation to locate its source, and measuring its spectrum to see whether it is thermal and at what temperature.Sections 2.3.8, 2.3.9 and 2.3.11; Conclusions
The way in
https://arxiv.org/abs/0910.5893How to cite it
Garret Moddel, Olga Dmitriyeva (2019) Extraction of Zero-Point Energy from the Vacuum: Assessment of Stochastic Electrodynamics-Based Approach as Compared to Other Methods doi:10.3390/atoms7020051