Mechanisms of Hypomagnetic Field Biological Effects: Quantum Rotator Versus Radical Pair
Abstract
The radical pair mechanism (RPM) struggles to explain the biological effects of weak magnetic fields due to rapid spin decoherence. To address this, we propose a mechanism based on the quantum behavior of a nanoscopic molecular rotator (approximately 1 nm in size) modeling an amino acid residue in a biosynthesizing enzyme. Using the Liouville–von Neumann equation with chemical kinetics and phenomenological decoherence, we show that MF effects arise from modulation of the rotator’s quantum interference pattern rather than from spin prohibition. Our results demonstrate that effects of several tens of percent occur in very weak magnetic fields (below 0.1 mT), are relatively robust to decoherence, and that while temperature promotes decoherence, it also enables the formation of a magnetic field-sensitive interference pattern. Under realistic parameters, the angular distribution of the rotator’s probability density rotates by several degrees in the geomagnetic field. The rotator mechanism implies that evolution has adapted organisms to use the geomagnetic field for nearly error-free biosynthesis; under hypomagnetic fields, biosynthetic errors increase. Unlike the RPM, this mechanism achieves high sensitivity by operating via magnetic field-induced phase changes rather than magnetic moment energy, thereby circumventing the standard quantum limit. Although tentative and lacking direct experimental evidence, the quantum rotator mechanism provides a biophysically transparent…
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