Wormholes| Wormholes |
In General > s.a. causality
violations ["time machines"]; spacetime
topology; wormhole solutions.
* Idea: Einstein-Rosen "bridges" or "handles," connecting
either (i) different universes or regions of one universe (relativists' view),
or (ii) two timelike related regions of a universe, representing the transient
phenomenon
of emission and reabsorption of a baby universe (hep theorists);
Usually studied
in the Euclidean regime.
* Motivation: Important
because they represent non-perturbative features of quantum gravity; Interesting
for two reasons,
- Macroscopic: Time travel (need
exotic matter –enormous negative pressures– but could be made stable);
- Microscopic: They fix the
constants of nature (Hawking – Consequences are unpredictable changes
in the constants,
loss of information down the holes; Coleman – Consequence
is the big fix of the constants, in particular the cosmological constant; Unruh – All
wrong, one must
include more paths in the calculations).
* Possible observation:
Bursts associated with their instability, or microlensing with unusual signature.
* Remark: Wormholes appeared
in an episode of "Star Trek: the Next Generation",
03.1990.
@ I: issue disc(89)jun; Halpern 92; in Thorne 94.
@ II: Redmount NS(90)apr28;
Clarke Nat(90);
Simon PW(94)dec;
Visser
95.
@ And phenomenology: Kardashev et al IJMPD(07)ap/06;
Damour & Solodukhin a0704 [mimicking
black holes]; Hyun et al a0705 [from
gravitational collapse]; Strokov & Repin a0709-G&C
[perihelion precession and
light deflection].
Classical and Semiclassical Aspects > s.a. casimir
effect; self-force; lensing;
quantum field theory effects [negative
energies].
* Traversibility: It
is accompanied by unavoidable violations of the weak energy condition ("exotic
matter").
@ Framework: Friedman et al PRD(90) [Cauchy problem]; Hayward IJMPD(99)gq/98,
gq/03-in
[dynamical laws].
@ And time machines: Frolov & Novikov PRD(90);
Echeverría et al PRD(91);
Antonsen & Bormann qp/96-in.
@ Other effects, phenomenology: Frolov & Novikov PRD(93)
[as probes of black hole interiors]; González-Díaz PRD(97)gq [on
electromagnetic waves]; Hochberg & Visser PRL(98)gq [null
energy condition violation]; Hong & Kim MPLA(06)
[thermodynamics, T < 0]; Aref'eva & Volovich a0710 [production
at LCH, as time machines]; > s.a. dark
matter.
@ Semiclassical: Hawking NPB(91)
[effective action]; Khatsymovsky PLB(94)
[quantum field theory in curved spacetime]; Hochberg et al PRL(97)gq;
Khusnutdinov & Sushkov PRD(02)ht [massive
scalar]; Khusnutdinov PRD(03);
Garattini CQG(05)gq [self-consistent
to graviton 1-loop]; Buniy & Hsu PLB(06)ht/05 [instability];
Garattini & Lobo CQG(07)gq [phantom].
@ And chronology protection: Visser PRD(97)gq.
Quantum Aspects > s.a. kaluza-klein [higher-dimensional
dyons]; minisuperspace; frw
quantum cosmology.
* Motivation: Used to
explain the smallness of the cosmological constant, and as a mechanism for
loss of coherence.
@ General references: Visser PRD(91),
MPLA(91)
[Planck-size throat]; González-Díaz MPLA(93);
Hochberg PRD(95)gq [Lorentzian].
@ And constants of nature: Hawking NPB(90); > s.a. quantum
gravity and cosmology [including cosmological constant].
@ And quantum gravity: Hawking MPLA(90),
MPLA(90) [baby universes]; > s.a. quantum
regge calculus; spacetime foam.
@ Black hole pair creation: Garattini NCB(98)gq/96;
González-Díaz
IJMPD(97)gq/96.
@ Related topics: Coleman & Lee NPB(90);
Hawking & Page PRD(90)
[spectrum]; González-Díaz PRD(90)
[coherence]; Ellis et al PLB(90),
Moss Nat(90)feb
[in SQUIDs]; Garfinkle & Strominger PLB(91)
[instanton for pair of RN black holes]; Coleman & Hughes PLB(93)
[global charge]; Cavaglià MPLA(94)
[Kantowski-Sachs]; Lee & Kim PLB(04)
[2D dilaton + ghost Klein-Gordon]; Santini qp/07-in,
qp/07/EPL
[as
origin of EPR correlations]; Garattini CQG(07)
[traversable, and equation of state].
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Send feedback and suggestions to bombelli at olemiss.edu – Modified
22 jul 2008