10 citations · 11 across the 4 of their papers we have counts for
3 papers · 1 filter
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…
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…