Multiverse
Cosmology| Multiverse
Cosmology |
Multiple Universes in General > s.a. cosmology.
* Level 1: Regions beyond our cosmic horizon (same laws and constants).
* Level 2: Other post-inflation
bubbles (same laws, different constants); Includes "black hole babies",
with natural selection related to the anthropic principle, as in Smolin's ideas
(values of constants of nature are adjusted to maximize black hole
production),
baby universes as in quantum, cosmology, and the various possibly interacting
branes in the brane scenario.
* Level 3: The many
worlds (parallel universes) of quantum physics; > s.a. many
worlds.
* Level 4: Other mathematical structures and laws of physics.
@ I: Krauss 06 [alternate realities]; Vilenkin 06.
@ General references: Deutsch PRS(02)qp/01 [information
in multiverse]; Rubin CSF(02)ap [and
life]; Ellis et al MNRAS(04)ap/03;
Tegmark SA(03)may, in(03)ap;
Davies MPLA(04)ap [rev];
Bjorken ap/04/PRD;
Stoeger et al ap/04 [philosophical];
Bettini phy/05/Kairos
[history]; Weinberg ht/05-in;
McCabe gq/06 [various
notions]; Davies ap/06-in
[the problem of what exists]; Carr ed-07 [r pw(07)nov];
González-Díaz
et al a0705 [as
resolution of some problems]; Barrau CERN(07)-a0711 [intro
rev]; Hall & Nomura a0712 [argument
in favor from unnaturalness]; Mersini-Houghton a0804.
@ Level 1:
Scott & Zibin IJMPD(06)ap [how
many are there?]; Page a0801-in [and Christian theology].
@ Level 2: Markov PLA(90);
Garriga & Vilenkin PRD(01)gq [different
regions from inflation]; McCabe FPL(05)
[topology of branching universes]; Aganagic et al NPB(07)ht/06 [entanglement
of baby universes]; Aguirre
et
al PRD(07)-a0704 [bubble
collisions and observations]; Ferrando et al PRD(07)-a0706 [creatable
universes, with
vanishing conserved quantities]; Ansoldi & Guendelman a0706 [with
arbitrarily
small energy cost]; Placek & Müller SHPMP(07)
[branching spacetimes]; > s.a. brane
scenarios,
inflationary scenarios, wormholes [baby
universes].
@ Anthropic reasoning:
Aguirre & Tegmark JCAP(05)ht/04
[and coincidences]; Weinstein CQG(06)ht/05.
@ Cosmic natural selection, fine-tuning: Smolin CQG(92), gq/94,
97;
Vaas gq/02-in;
Smolin
PhyA(04);
Susskind ht/04 [comments];
Vilenkin ht/06 [objection
to argument]; McCabe gq/06 [extension];
Smolin ht/06 [status
and comments]; Palonen a0802 [Bayesian
considerations].
Statistical Cosmology
* Idea: Gell-Mann coined
the term "multiverse"; The "principle
of mediocrity", a version of the anthropic one, states that we are a typical
civilization in the multiverse.
* Setup: The probability that the constants of nature have values
c = {cj}
is Pc = wc Nc,
with wc the probability
for a random universe to have values c, and Nc
the number of civilizations with values c (assume
a finite inflation) =
Vc Kc,
with Vc the volume at the end of inflation, and
Kc the "number of civilizations
per unit volume".
@ Probabilities and predictions: Vilenkin ht/06;
Garriga & Vilenkin PRD(08)-a0711; > s.a. probability
in physics [propensity].
Other Issues > s.a. anthropic
principle; variation
of constants.
@ Physical constants: Gouts G&C(03)gq/02;
Vilenkin
PRL(95)gq/94,
PRD(95)gq,
gq/95-in [and
quantum cosmology, inflation].
@ Predictions: Aguirre ap/05-in;
Stoeger ap/06 [retroductive
tests]; Page ht/06-in;
Aguirre & Johnson a0712 [bubble
universes].
@ Multiverse as space of all classical universes: Gibbons & Turok
PRD(08)ht/06,
Vilenkin JPA(07)gq/06,
JHEP(07)
[measure].
@ Related topics: Gouts gq/02-in
[topos theoretic]; Palesheva MSM(02)qp,
G&C(03)
[particle
interference]; Bousso & Freivogel JHEP(07)ht/06 [paradox];
Gehrels a0707;
Donoghue in(07)-a0710 [and particle masses].
Online Resources > see Max Tegmark's page; Wikipedia page.
Main page – Abbreviations – Journals – Comments – Other
sites – Acknowledgements
Send feedback and suggestions to bombelli at olemiss.edu – Modified
10 jun 2008