01
Plasma Physics
Reconnection Runs on an Aspect Ratio
The rate of magnetic reconnection is set by the aspect ratio of the current sheet rather than by resistivity, so a thin sheet reconnects fast even in a highly conducting plasma.
Twenty-nine subfields · one claim each · not peer reviewed
The earlier volumes leaned biological, earthly and social. This one goes to the physical sciences: from magnetic reconnection to metrology, one claim per subfield, each with a mechanism and a stated refutation.
The rate of magnetic reconnection is set by the aspect ratio of the current sheet rather than by resistivity, so a thin sheet reconnects fast even in a highly conducting plasma.
Transition to turbulence in rotating and stratified flow is set by the ratio of strain to rotation rather than by Reynolds number alone.
Granular segregation occurs only above a critical size ratio between particles, so mixtures with a modest size difference mix indefinitely.
Colloidal gelation occurs at a volume fraction set by the range of attraction rather than by the strength of attraction, so short-range attractions gel at much lower fractions.
The entanglement plateau modulus of a polymer melt is set by the packing length rather than by molecular weight, so two polymers of very different molecular weight can have the same modulus.
Battery rate capability is set by the ratio of exchange current density to the diffusion length rather than by electrode thickness alone.
Photochemical quantum yield is set by the ratio of excited-state lifetime to vibrational relaxation time rather than by absorption cross-section.
The sticking probability of a molecule on a surface depends on the ratio of its translational energy to the surface phonon energy rather than on surface temperature alone.
Steady-state entropy production in a driven system reaches a minimum at an intermediate gradient rather than decreasing monotonically toward equilibrium.
The anomalous diffusion exponent of a particle in a crowded medium is set by the ratio of obstacle density to the particle's persistence length, not by the density alone.
Entanglement growth in a chaotic quantum system is set by the operator spreading front rather than by the interaction strength, so stronger coupling can slow apparent growth by reshaping the front.
Nuclear shell closures shift with neutron-proton asymmetry rather than being fixed by magic numbers, so a number that is magic in one isotope is not in another.
Isotope shifts in heavy atoms become nonlinear at a critical neutron number because the nuclear charge radius changes shape, not just size, so a linear extraction of radius misleads.
The transition between hard and soft accretion states is set by the ratio of cooling time to heating time in the inner flow, not by accretion rate alone.
The pitch angle of galactic spiral arms is set by the ratio of disc mass to halo mass rather than by the rotation curve alone.
The survival of presolar grains through a shock is set by the ratio of shock duration to diffusion time rather than by peak temperature.
Chondrule texture is set by the ratio of cooling rate to nucleation rate rather than by peak temperature, so the same peak produces different textures.
A planetary dynamo requires the ratio of heat flux to the adiabatic gradient to exceed a threshold, so a hot core alone does not generate a field.
The brittle-to-ductile transition in rock is set by the ratio of pore pressure to confining pressure rather than by depth.
The width of a shear band in soil is set by the ratio of grain size to specimen size rather than by confining pressure.
The depth of the ocean mixed layer is set by the ratio of surface buoyancy flux to wind stress rather than by wind speed alone.
Lightning initiation is set by the ratio of ambient field to hydrometeor size rather than by field strength, so weak fields with large particles can discharge.
Iceberg calving is set by the ratio of water depth to ice thickness at the terminus rather than by melt rate.
Soot emission is set by the ratio of residence time in the rich zone to the oxidation time in the lean zone, not by equivalence ratio alone.
Galvanic corrosion rate is set by the ratio of cathodic to anodic area rather than by potential difference alone.
Anti-wear tribofilm formation requires the contact flash temperature to exceed a fraction of the additive's decomposition temperature, so load and speed act only through that ratio.
Discontinuous shear thickening occurs when the hydrodynamic stress exceeds the repulsive interparticle stress, so it appears at a critical ratio rather than a critical shear rate.
The superfluid transition in a confined geometry occurs at a temperature set by the ratio of pore size to the healing length rather than by the bulk transition alone.
The uncertainty of a measurement that is averaged over time reaches a minimum set by the ratio of averaging time to drift time, rather than decreasing indefinitely with more averaging.
Twenty-nine subfields that the series had either skipped or treated as background. The entries are short by design: a claim, the mechanism that would make it true, two predictions, and the result that kills it. No bibliography; the evidence is the standard picture of each subfield rather than a specific paper.
Entry page: stoa.html. There is deliberately no index.html.
Publication records: source hashes · original README · original manifest · additive publication note