Causality Violations| Causality Violations |
In General
> s.a. Action at a Distance; information;
Superluminal Communication / Travel; wave phenomena.
* Ways to violate causality:
Superluminal local travel from classical physics (tachyons, ...), due to quantum
effects (quantum tunneling, quantum field theory effects), "global"
effects due to non-trivial spacetime topology (wormholes, Misner space, ...);
Superluminal travel requires violations of the averaged null energy condition.
@ General references: issue disc(89)jun;
Nahin 98;
Gott 01;
Davies 01;
Toomey 07 [r pw(08)jan];
Lobo ch-a1008 [rev];
Polonyi PRD(11)-a1109 [dynamical breakdown];
Wüthrich a1907-in [in the emergent spacetime of quantum gravity].
@ Detection: Haque & Joglekar JPA(09)-a0808 [non-local scalar model].
@ Philosophical: Smith BJPS(97) [slipping on banana peels];
Dowe PhSc(03)jul [coincidences];
Raju FP(06)-a0804 [time travel and spontaneity].
Related topics: see causality violations in quantum
theory [including time travel, indefinite causal structures]; non-causal spacetimes.
Spacetimes with Closed Timelike Curves / Time Machines
> s.a. wormholes [including Krasnikov tube].
* Warp drive: A spacetime in
which a flat warp bubble moves, preceded by a region of contracting
spacetime and followed by one of expanding spacetime; A spaceship inside the
bubble, although locally moving slower than light, could reach its destination
faster than a light beam travelling outside the warp bubble; However, warp
drives are quantum-mechanically unstable because they produce unboundedly
blueshifted Hawking-like radiation at their front wall.
@ General references: Novikov JETP(89);
Krasnikov CQG(94),
PRD(96)gq/95 [quantum stability],
CQG(98)gq/97 [singularity-free],
PRD(98)gq/95,
PRD(99)gq/98 [and quantum field theory],
CQG(02)gq/01 [no-go in classical general relativity],
gq/03-conf [rev];
Carlini et al IJMPD(95),
Carlini & Novikov IJMPD(96) [self-consistency];
Low CQG(95);
Woodward FPL(95);
Davies SA(02)sep;
Krasnikov gq/06 [intro];
Al-Khalili 11;
González-Díaz PRD(12),
Devin a1302 [thermal properties];
Everett & Roman 13;
Arefeva et al PRD(16)-a1508 [holographic dual];
Neves a1709 [philosophical argument against];
Tobar & Costa CQG(20)-a2001 [complex dynamics without inconsistencies];
Luminet Univ(21)-a2101 [historical survey].
@ Gott time machines:
Gott PRL(91) [moving cosmic strings];
Carroll et al PRL(92),
Deser et al PRL(92) [obstacles];
Holst GRG(96)gq/95 [in AdS];
Birmingham & Sen PRL(00) [BTZ black holes and scaling].
@ Warp drive: Alcubierre CQG(94)gq/00;
Pfenning & Ford CQG(97)gq [unphysical];
Coule CQG(98);
Low CQG(99) [need for exotic matter];
Clark et al CQG(99)gq [null geodesics];
González-Díaz PRD(00)gq/99 [stability];
Van Den Broeck CQG(99)gq;
Loup et al gq/01,
gq/02;
Hart et al gq/02 [hazards];
White GRG(03) [mechanism];
Lobo & Visser CQG(04)gq [limitations],
gq/04-proc [linearization, energy];
Ellis gq/04 [and antigravity];
González-Díaz PLB(07) [superluminal];
Obousy & Cleaver JBIS-a0712 [and extra dimensions];
Finazzi et al PRD(09)-a0907,
Barceló et al a1001-FQXi [semiclassical instability];
Müller & Weiskopf GRG(12)-a1107 [null and timelike geodesics];
Coutant et al PRD(12)-a1111 [instability with Lorentz-invariance violation];
McMonigal et al PRD(12)-a1202
+ news cosmos(12)mar [interaction with massive particles];
Varieschi & Burstein ISRN(13)-a1208 [in conformal gravity];
blog(12)nov,
blog(14)jun [is it possible?];
Liberati a1601-GR14
[pre-emptive superluminal warp drive destabilization];
Alcubierre & Lobo FTP(17)-a2103;
Bobrick & Martire CQG-a2102 [physical];
> s.a. quantum field theory effects [negative energy];
David Waite's page;
Wikipedia page.
@ Production in experiments:
Mironov et al in(06)-a0710,
Aref'eva & Volovich IJGMP(08)-a0710 [LHC].
@ Other spacetimes with closed timelike curves:
González-Díaz PRD(98)gq/97 [quantum];
DeDeo & Gott PRD(02) [2+1 Anti-de Sitter];
Charette et al JGP(03)m.DG/02 [closed timelike curves in flat 3D];
Ori PRL(05)gq [compact vacuum core],
PRD(07)gq [development from regular initial surface];
Manchak SHPMP(11);
Elze EPJW(13)-a1310 [and discrete mechanics];
Mulder & Dieks a1704 [determinism and indeterminism];
Ghosh et al QIP(19)-a1708 [integer factorization],
QIP-a1708 [cryptographic protocols];
Hazarika a2004 [axially symmetric];
Paganini a2005 [nothing happens].
@ Related topics:
news sn(14)jan [search fails to find evidence for time travelers].
Note to time travelers: You are all welcome to the party that Stephen Hawking hosted in 2009.
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