3 papers
gr-qc2026
Steering a warp drive without exotic matter
An T. Le
A useful warp drive must accelerate, yet every compact positive-energy construction is static or constant-velocity; accelerating ones need exotic matter, abandon the dominant energ…
gr-qc2026
On the boundary cost of source-consistent warp shells
An T. Le
We study classical energy-condition admissibility for subluminal, positive-energy warp shells. For the constructions examined here, the energy-condition failures are localized at t…
astro-ph.HE2026
Rarity of rocket-driven Penrose extraction in Kerr spacetime
An T. Le
We study rocket-driven Penrose extraction in the test-particle limit on a fixed Kerr background for equatorial prograde flybys under explicit steering prescriptions. A spacecraft e…