Analüüs: Teadus & Tehnoloogia – 27 July 2026
Gravity Alters Quantum Circuit Readings Near Black Holes
Topic: Science
Sources: Phys.org
Researchers modeled a Josephson junction—a precise superconducting quantum device—held static outside a Schwarzschild black hole. Local quantum relations governing voltage, phase oscillation, and supercurrent remain unchanged, but a distant observer measures redshifted frequencies, voltages, and currents scaled by the gravitational redshift factor alpha. Critical current scales with one power of alpha and power with alpha squared, while interference patterns in a vertical SQUID show amplitude rescaling without first-order lobe shifts.
Josephson junctions convert voltage into quantum oscillations via paired-electron phase differences and form the basis of SQUIDs for sensitive magnetometry. Prior work treated them in flat spacetime with shared clocks; curved spacetime requires distinguishing proper time at the device from asymptotic coordinates. The analysis uses gauge-invariant condensate momentum and conserved current in the static exterior geometry.
Uncertainties include the idealized non-rotating black hole and the impossibility of holding a physical device near the horizon, where acceleration diverges. Earth-based differential redshifts across meters are ~10^-16, far below current noise, limiting near-term tests to precision metrology or analogs. The framework clarifies that gravity modifies measurement bookkeeping rather than local quantum rules.
Seawater Extraction of Critical Minerals Advances
Topic: Energy
Sources: New Atlas, PNNL
Pacific Northwest National Laboratory researchers reported three linked processes to recover magnesium, lithium, nickel, platinum-group, and rare-earth metals from seawater or its derivatives. A co-flow reactor precipitates high-purity magnesium hydroxide by flowing seawater beside sodium hydroxide, cutting steps from the traditional Dow process. Desalination brine is split via bipolar membrane electrodialysis into acid and base streams; the acid leaches 37% more nickel from olivine than commercial HCl. Seaweed concentrates dilute metals for later extraction.
Seawater holds vast reserves—0.1% of global volume could supply critical elements for tens of thousands of years—but concentrations are low except for magnesium. Historical U.S. seawater magnesium production ended in the 1990s due to economics. Coupling to existing desalination plants could yield hundreds of tonnes of Mg(OH)2 daily from a single large facility while valorizing waste brine.
Scale-up economics, energy costs of pumping and electrodialysis, and environmental effects of intake, discharge, and large-scale seaweed cultivation remain unresolved. Lab recoveries have not yet proven commercial viability; seaweed extraction efficiency is still below target baselines.
Mount Etna May Form via Unique Mantle-Melt Mechanism
Topic: Science
Sources: New Atlas, University of Lausanne
A University of Lausanne–INGV study proposes that Mount Etna is fed by long-lived magma pockets in the upper-mantle low-velocity zone rather than classic subduction or hotspot melting. Tectonic bending near the subduction zone fractures the lithosphere, squeezing pre-existing melts upward like liquid from a sponge—analogous to petit-spot volcanoes but scaled to a 3000 m stratovolcano active for ~500,000 years. Lava geochemistry has remained consistent across half a million years of eruptions.
Standard volcano categories are mid-ocean ridges, subduction zones, and hotspots. Etna sits near a subduction zone yet shows hotspot-like chemistry without an underlying plume. Petit-spot volcanoes, first identified off Japan, are small seamounts tapping similar stagnant melts; Etna would be the first large terrestrial example.
Confirmation requires broader geochemical and geophysical tests. If correct, Etna becomes a unique surface window into lithosphere–asthenosphere boundary melts and may imply other unrecognized “petit-spot giants,” altering hazard models for Sicily. Alternative hybrid mechanisms cannot yet be fully excluded.