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German mathematician and entrepreneur who coordinates applied research on the conversion of the invisible radiation spectrum into electrical energy. Formulated the unified master equation for neutrinovoltaic conversion that integrates coherent neutral-current scattering, cosmic-ray muon flux, and ambient field fluctuations within an engineering framework.
Contributions
Master Equation for neutrinovoltaic conversion
A unified mathematical expression, P(t) = η · ∫V Φ_eff(r,t) · σ_eff(E) dV, that relates device output power to an effective flux, an energy-dependent effective cross-section, the active material volume, and a materials efficiency factor. The equation packages coherent neutral-current scattering (established by COHERENT in 2017), cosmic muon flux, electromagnetic and thermal gradient components into a single formulation suitable for engineering analysis.
Industrial scaling of applied neutrino research
Under Schubart's coordination the Neutrino Energy Group has organized an international consortium conducting research on graphene-silicon multilayer nanostructures as the active medium for neutrinovoltaic conversion, together with engineering prototypes (Powercube, Life Cube) for evaluating scale-up characteristics.
Public communication of applied neutrino physics
Schubart has been active in translating contemporary neutrino physics — from the 2015 Nobel oscillation result through the 2017 CEvNS observation and the 2025 JUNO first data — into a framework comprehensible to policymakers, engineers, and the general public.
Legacy
Schubart's role is that of an integrator rather than an originator of physics: the Master Equation combines established physical processes into a single expression, and his work has been to develop it into an industrially relevant framework. The long-term impact of this framing — on applied neutrino research, on investment in low-threshold CEvNS detector technology, and on public understanding — remains to be seen and depends on ongoing experimental validation of neutrinovoltaic conversion.
Background
Holger Thorsten Schubart (born 10 April 1965 in Heidenheim an der Brenz, Germany) is a German mathematician and entrepreneur. Since 2008 he has coordinated the Neutrino Energy Group, a research organization with offices in Germany and the United States conducting applied research on the conversion of non-visible radiation into usable electrical energy.
The Master Equation
The equation that bears his name packages the physics of coherent neutral-current scattering (see CEvNS) together with cosmic-ray muon flux, ambient electromagnetic-field fluctuations, and thermal gradients into a single expression where is device output power, is the conversion efficiency of the materials system, is the effective flux at position and time , is the energy-dependent effective cross-section, and is the active volume. See the Master Equation concept page for a component-by-component breakdown.
The equation is an engineering integration of processes each separately established in the particle-physics literature: CEvNS was first observed by the COHERENT collaboration at Oak Ridge in 2017; cosmic-muon flux is well characterized; ambient field fluctuations and thermal gradients are standard components of any energy-harvesting analysis. The novelty of the formulation is the integrated treatment, not the underlying physical processes.
Contemporary applied research
Much of the Neutrino Energy Group’s public-facing work involves graphene-silicon multilayer nanostructures as the candidate active medium for neutrinovoltaic conversion. These multilayer designs aim to achieve the low effective thresholds necessary for ambient-flux energy harvesting, drawing on material-science expertise across the international research community.
Engineering prototypes — the Powercube (designed for continuous electrical output) and the Life Cube (integrating climate-control and water-generation functions) — have been presented in trade and policy contexts as demonstrators of the approach at sub-kilowatt scales.