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Warp Drive in a De Sitter Universe
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Warp Drive in a De Sitter Universe
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Generalizing the result of H. Ellis who embedded a warp bubble in the background of a black hole, we introduce a warp bubble in a de Sitter universe. We show that under certain conditions (namely, that the bubble is moving in the radial direction at a velocity equal to the speed of the expansion of the universe), it is possible for the bubble to have strictly non--negative energy density, with the weak and null energy satisfied up to a total divergence term that averages to zero. We discuss the implications of this result and its possible applications to models of dark energy like "dark fluid" and quintessence, as well as to physical systems like Casimir cavities and analogue gravity setups.
Forward citations
Cited by 4 Pith papers
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Steering a warp drive without exotic matter
A positive-energy spacetime for steering a warp drive is constructed by matching an exact Kinnersley photon rocket exterior to a flat interior through a timelike shell that satisfies the dominant energy condition unde...
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Steering a warp drive without exotic matter
A positive-energy steerable warp drive is constructed by matching the Kinnersley photon rocket to a flat passenger worldtube, with acceleration controlled by Bondi mass loss obeying a closed-form law.
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Observer-robust energy condition verification for warp drive spacetimes
Warpax toolkit demonstrates that observer-robust optimization finds more extensive and severe energy-condition violations in warp drive metrics than single-frame Eulerian analysis.
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On the boundary cost of source-consistent warp shells
Source-consistent warp shells fail energy conditions at the source-vacuum boundary in all examined constructions and parameter scans.
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