2 papers
gr-qc2026
Boundary Obstructions and Lapse Freedom in Static Spherical Hollow Cores
Nelson Bolívar, Gabriel Abellán, Ivaylo Vasilev
We analyze a sharply delimited comparison problem for a static spherical hollow core: an empty, flat cavity surrounded by a positive matter wall. In the unit-lapse, flat-slice radi…
cond-mat.soft2026
Covariance-Driven Momentum Rectification at Liquid-Vapor Interfaces Near Wetting Transitions
Nelson BolÃvar, Gabriel Abellán, Ivaylo Vasilev
Zero-mean forcing can generate directed transport when a medium responds in a spatially structured way and the relevant symmetries are broken. Liquid-vapor interfaces are a useful…