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Differential patterns of cortical expansion in fetal and preterm brain development
da Silva M +4 more
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Predatory orienting is jointly controlled by optic tectum and pretectum
Antinucci P +2 more
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SEMICLASSICAL WARP-DRIVE INSTABILITY
The Twelfth Marcel Grossmann Meeting, 2012Warp drives are very interesting configurations of General Relativity, since they provide, at least theoretically, a way to travel at superluminal speeds. Even if one succeeded in building them, it would still be necessary to check whether they would survive to the switching on of quantum effects.
Finazzi S, Liberati, Stefano, Barcelo C.
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Physical Review D, 1996
Alcubierre recently exhibited a spacetime which, within the framework of general relativity, allows travel at superluminal speeds if matter with a negative energy density can exist, and conjectured that it should be possible to use similar techniques to construct a theory containing closed causal loops and, thus, travel backwards in time.
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Alcubierre recently exhibited a spacetime which, within the framework of general relativity, allows travel at superluminal speeds if matter with a negative energy density can exist, and conjectured that it should be possible to use similar techniques to construct a theory containing closed causal loops and, thus, travel backwards in time.
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Classical and Quantum Gravity, 1998
Summary: The warp drive spacetime of \textit{M. Alcubierre} [Class. Quantum Grav. 11, L73--L77 (1995)] is impossible to set up without first being able to distribute matter at tachyonic speed, put roughly, you need one to make one! However, over small distances, where energy conditions possibly can be viotated, one can envision opening the light-cones ...
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Summary: The warp drive spacetime of \textit{M. Alcubierre} [Class. Quantum Grav. 11, L73--L77 (1995)] is impossible to set up without first being able to distribute matter at tachyonic speed, put roughly, you need one to make one! However, over small distances, where energy conditions possibly can be viotated, one can envision opening the light-cones ...
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AIP Conference Proceedings, 2000
Warp drives are widely perceived by the public to be the propulsion system of choice in the not too distant future. Engineers and scientists usually ignore the possibility because of the apparently insurmountable obstacles required to create a warp drive.
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Warp drives are widely perceived by the public to be the propulsion system of choice in the not too distant future. Engineers and scientists usually ignore the possibility because of the apparently insurmountable obstacles required to create a warp drive.
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Modified Alcubierre Warp Drive II
2015A solution of general relativity is presented that describes an Alcubierre propulsion system in which it is possible to travel at superluminal speed while reducing the energy density and energy by an arbitrary value.Here we investigate the negative energy in the Pfenning zone or warped region, and the quantum inequalities involved.
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