Warp drives are very interesting configurations of General Relativity: they provide a way to travel at superluminal speeds, albeit at the cost of requiring exotic matter to build them. Even if one succeeded in providing the necessary exotic matter, it would still be necessary to check whether they would survive to the switching on of quantum effects. Semiclassical corrections to warp-drive geometries created out of an initially flat spacetime have been analyzed in a previous work by the present authors in special locations, close to the wall of the bubble and in its center. Here, we present RI I exact, numerical analysis of the renormalized stress-energy tensor (RSET) in the whole bubble. We find that the the RSET will exponentially grow in time close to the front wall of the superluminal bubble, after some transient terms have disappeared, heace strongly supporting our previous conclusion that the warp-drive geometrlis are unstable against semiclassical back-reaction. This result seems to implement the chronology protection conjecture, forbiddig the set up of a structure potentially dangerous for causality.

Superluminal warp drives are semiclassically unstable / Finazzi, S.; Liberati, Stefano; Barceló, C.. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6588. - 222:1(2010), pp. 1-10. (Intervento presentato al convegno First Mediterranean Conference on Classical and Quantum Gravity tenutosi a Creta, Grecia nel 13-18/09/2009) [10.1088/1742-6596/222/1/012046].

Superluminal warp drives are semiclassically unstable

Liberati, Stefano;
2010-01-01

Abstract

Warp drives are very interesting configurations of General Relativity: they provide a way to travel at superluminal speeds, albeit at the cost of requiring exotic matter to build them. Even if one succeeded in providing the necessary exotic matter, it would still be necessary to check whether they would survive to the switching on of quantum effects. Semiclassical corrections to warp-drive geometries created out of an initially flat spacetime have been analyzed in a previous work by the present authors in special locations, close to the wall of the bubble and in its center. Here, we present RI I exact, numerical analysis of the renormalized stress-energy tensor (RSET) in the whole bubble. We find that the the RSET will exponentially grow in time close to the front wall of the superluminal bubble, after some transient terms have disappeared, heace strongly supporting our previous conclusion that the warp-drive geometrlis are unstable against semiclassical back-reaction. This result seems to implement the chronology protection conjecture, forbiddig the set up of a structure potentially dangerous for causality.
2010
1st Mediterranean Conference on Classical and Quantum Gravity, MCCQG 2009
222
1
1
10
IOP
Finazzi, S.; Liberati, Stefano; Barceló, C.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/15379
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