3 papers
physics.optics2026
Gain-controlled directional scattering in core-shell nanoparticles mediated by magnetic toroidal dipoles
Tiago J. Arruda
Toroidal dipole moments arise from poloidal current distributions and form a distinct class of electromagnetic excitations with unique near-field characteristics. Using Lorenz-Mie…
astro-ph.GA2026
TOPoS VII. Age-metallicity relation in the Galactic halo and assembly of the Milky Way
P. Bonifacio, Y. Lebreton, I. Koutsouridou +8
One technique for determining stellar ages is to compare the position of a star in the Hertzsprung-Russell diagram to theoretical stellar evolutionary tracks. The sub-giant evoluti…
astro-ph.GA2026
Evidence of radial-migration driven Galactic disc expansion with the U-shape stellar age profile
Jianhui Lian, Qinhao Shao, Yuze Zhao
Canonical theory predicts galaxies grow "inside-out", producing their observed negative radial age gradient. This picture is challenged by galaxies' `U-shaped' colour profiles -- i…