10 citations · 11 across the 4 of their papers we have counts for
5 papers
Zero expansion is not free: the sharp minimum of Eulerian negative energy in Natário warp drives
Nelson Bolívar, Ivaylo Vasilev, Gabriel Abellán
Natário's warp drive replaces the contraction and expansion of the Alcubierre bubble by a divergence-free shift. We determine exactly how much Eulerian negative energy this constru…
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…
Covariance-Driven Momentum Rectification at Liquid-Vapor Interfaces Near Wetting Transitions
Nelson Bolívar, 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…
Warp drive solutions in spherical coordinates with anisotropic matter configurations
Gabriel Abellán, Nelson Bolívar, Ivaylo Vasilev
In this work we study the influence of isotropic and anisotropic fluids on the spherically symmetric warp metric. We evaluate the energy conditions and the influence of including a…
Influence of anisotropic matter on the Alcubierre metric and other related metrics: revisiting the problem of negative energy
G. Abellan, N. Bolivar, I. Vasilev
Negative energy scenarios are the most widely studied for the warp metric. In fact, the prevailing view in the community so far has been that the warp metric necessarily has negati…