Analüüs: Teadus & Tehnoloogia – 30 July 2026
Muon g-2 Calculations Resolve Old Puzzle but Spark New Conflicts
Topic: Science,
Sources: Quanta Magazine.
New lattice QCD calculations of the muon’s anomalous magnetic moment (g-2) now match Fermilab’s precise experimental measurements to high accuracy, apparently closing a 25-year discrepancy that once hinted at unknown particles. The data-driven method, based on electron-positron collision rates producing pions, continues to predict a larger wobble, creating tension with both the lattice results and the latest Fermilab data. Recent measurements at Siberia’s VEPP-2000 collider show a significantly altered pion production rate compared with older data from the same and other facilities, aligning better with lattice predictions.
The muon g-2 serves as a sensitive probe of all known particles via virtual quantum loops; the strong force contribution has long been the hardest to compute. Lattice simulations divide spacetime into a grid to model quark behavior, while the data-driven approach infers it from collider data. Earlier Brookhaven and Fermilab results appeared to exceed Standard Model expectations by amounts approaching discovery thresholds.
Key uncertainties center on whether the conflicting pion rates reflect experimental systematics, procedural differences, or genuine new physics. Independent lattice groups confirm the BMW collaboration’s matching result, yet older BABAR data still support the prior higher rate. Further collider runs and refined analyses will determine if the apparent resolution holds or if residual anomalies persist.
2D Device Achieves Room-Temperature Single-Electron Memory
Topic: Technology,
Sources: Phys.org.
Researchers in China have demonstrated an ultrathin graphene-based transistor that stores information using individual electrons at room temperature, detecting discrete 0.5-volt threshold shifts per electron addition or removal. The coplanar drain-channel-source layout with edge contacts minimizes fringe capacitance that previously blurred single-electron signals. States remained stable for at least 5,000 seconds in tests, with analysis suggesting potential retention up to 10 years.
Conventional memories trap many electrons per bit; single-electron operation promises denser, lower-power storage but has been limited by stray electrical coupling and short lifetimes. Prior nanoscale polysilicon dots achieved room-temperature detection only briefly. A secondary low-temperature design also showed deliberate “density-of-states scissors” manipulation to skip specific quantum states.
Scaling to dense arrays and confirming long-term room-temperature state control remain open challenges. The approach relies on atomically thin materials to suppress unwanted capacitance, but manufacturability and integration with existing semiconductor processes are unproven. Further work must verify the state-skipping effect at ambient conditions.
First Omnidirectional 3D Thermal Cloak Steers Heat Around Objects
Topic: Technology,
Sources: New Atlas.
Engineers at the University of Illinois Urbana-Champaign and Technical University of Denmark fabricated a free-form 3D thermal cloak using a 3D-printed aluminum lattice filled with low-conductivity PDMS silicone. It guides heat flow around an enclosed irregular object from multiple directions, restoring external isotherms so an infrared camera sees little disturbance. Lab tests with pear- and heart-shaped designs under controlled gradients scored near-perfect cloaking metrics (0.037–0.079 on a 0–1 scale).
Prior thermal cloaks were largely 2D, axis-limited, or restricted to simple geometries. Transformation thermotics mapped the required anisotropic conductivity; a de-homogenization algorithm converted this into a printable lattice of tunable bars. The hybrid structure creates directional heat highways while blocking others.
The prototype operates only in steady-state conduction within a solid matrix and does not yet suppress radiative emission from self-heating objects in open air. It is rigid and shape-specific rather than a flexible cover. Extensions to active multifunctional versions that manage internal heat sources are planned but untested.