Semiclassical Quantum Gravity  

In General > s.a. canonical and covariant quantum gravity [Minkowski and stability]; quantum geometrodynamics [WKB approximation].
* Remark: The breakdown in the semiclassical approximation can be a coordinate-dependent phenomenon.
@ General references: Barvinsky PLB(90) [and Wheeler-DeWitt equation, unitarity]; Lifschytz et al PRD(96)gq/94 [canonical]; Schuller & Wohlfarth PLB(05)gq/04 [and deformation of general relativity]; Livine BJP(05)gq-in [deformations and information]; Kiefer et al PRD(05)gq [supersymmetric quantum gravity]; Hsu & Reeb CQG(08)-a0803 [unitarity and Hilbert space]; Neville a0807 [spin networks].
@ In euclidean quantum gravity: Magnon JMP(81) [euclidean Levi-Civita as model for thermal fluctuations].
@ Spin foams: Magliaro et al CQG(08)-a0710 [with flipped vertex]; Bianchi & Satz NPB(08)-a0808 [and Regge calculus]; Conrady & Freidel PRD(08)-a0809 [Riemannian]; > s.a. spin-foam models [Barrett-Crane model].
@ In other approaches: Aastrup et al a0907 [spectral triple over holonomy loops]; Kuzmichev & Kuzmichev a0910 [geometrodynamical, extremely small scales].
> Related topics: see effective action.

Weave States in Loop Quantum Gravity > s.a. critical phenomena; renormalization.
* Idea: Weaves are kinematical states of quantum gravity which are simultaneous eigenstates of volume and area operators, and are meant to approximate classical geometries; Loops need to intersect for volumes not to vanish.
@ Flat space: Ashtekar et al PRL(92) [single loops]; Ashtekar in(93); Corichi & Reyes IJMPD(01)gq/00; Conrady CQG(05)gq/04; Shao et al IJTP(08) [Gaussian weave, metric operator].
@ Gravitons: Zegwaard NPB(92); Iwasaki & Rovelli IJMPD(93), CQG(94); Iwasaki gq/98.
@ Curved metrics: Borissov PRD(94) [plane waves]; Zegwaard PLB(93), CQG(93); Iwasaki gq/95 [Kerr-Newman].
@ Related topics: Grot & Rovelli GRG(97) [with intersecting loops]; Varadarajan & Zapata CQG(00)gq; Ma & Ling PRD(00)gq [degenerate metrics]; Ashtekar & Lewandowski CQG(01)gq [and Fock states]; Rovelli & Speziale CQG(06)gq [tetrahedron].

Semiclassical States and Continuum Limit > s.a. loop quantum gravity and topological field theories [Kodama state].
* Continuum limit: From renormalization group arguments, for it to exist the theory should have critical behavior.
@ Continuum limit: Smolin gq/95 [critical phenomena], gq/96; Kauffman & Smolin LNP(00)ht/98 [non-equilibrium critical phenomena]; Bojowald CQG(01)gq [loop quantum cosmology]; Ashtekar et al CQG(03)gq/02 [quantum mechanical model].
@ Recovering classical spacetime: de Souza & Silveira gq/99 [general relativity]; Tsushima gq/02/PRD [Gaussian state, metric]; Bojowald et al PRD(04)gq [coordinate time and length scales]; Freidel et al PRD(09)-a0905 [3D Boulatov model]; Kempf a0908 [sampling spacetime with ultraviolet cutoff]; > s.a. geometrical operators.
@ Coherent states: Thiemann CQG(01)ht/00, & Winkler CQG(01)ht/00, CQG(01)ht/00, CQG(01)ht/00; Sahlmann et al NPB(01)gq; Thiemann CQG(06)gq/02; Dasgupta JCAP(03)ht [around Schwarzschild]; Bojowald PRD(07)gq [dynamical, for quantum cosmology bounces]; Robles-Perez et al a0709 [dark energy model]; Bahr & Thiemann CQG(09)-a0709 [gauge-invariant, U(1)], CQG(09)-a0709 [gauge-invariant, SU(2)]; Neville a0807, a0807 [planar]; Flori a0904 [re area complexifier coherent states]; > s.a. FRW models.
@ Statistical geometry: Bombelli gq/01-MG9.
@ Other proposals: Arnsdorf gq/99 [semiclassical connections]; Sharatchandra & Gadiyar gq/00 [fitting area and length bits]; Zimmermann gq/00-in [entangled ensembles]; Mikovic CQG(04)gq, erratum CQG(06)gq [flat spacetime]; Koslowski a0709 ["condensate" of quantum geometry].
@ Corrections to classical dynamics: Schuller & Wohlfarth PLB(05) [accelerating universe, R–1 term]; > s.a. modified newtonian gravity.
@ With matter: Ita CQG(08)gq/07, CQG(08) [Klein-Gordon scalar, Kodama-like state]; Laddha & Varadarajan PRD(08)-a0805 [2D model]; > s.a. boundary conditions [Hartle-Hawking's no-boundary].

Phenomenology and Specific Spacetimes > s.a. quantum cosmology [decoherence]; quantum-gravity phenomenology [including stability].
@ Matter phenomenology: Smolin a0808 [effective deformed special relativity].
@ Black holes: Kiefer NPPS(97)gq [semiclassical states]; Frasca GRG(05)ht/04 [Schwarzschild, Bohr-Sommerfeld]; Dasgupta CQG(06)gq/05; Dasgupta & Thomas gq/06 [state degeneracy and entropy]; Cartin & Khanna PRD(06) [Schwarzschild interior]; Gambini & Pullin PRL(08)-a0805 [complete Schwarzschild]; Modesto a0811 [spacetime structure]; Husain & Terno a0903 [gravity + scalar collapse]; > s.a. quantum black holes.
@ In quantum cosmology: Sinha & Hu PRD(91) [limits of validity of minisuperspace aproach]; Kim CQG(96)gq [FRW model + scalar]; Pollock PLB(99) [FRW spacetime, from superstrings]; Appignani & Casadio JCAP(08)-a0711 [asymptotic freedom]; Ding et al PRL(09)-a0808 [lqc]; Pinto-Neto PRD(09)-a0904 [emergence of large universe]; Battisti et al a0905 [anisotropy suppression]; Kuzmichev & Kuzmichev a0905 [near initial singularity]; Robles-Pérez et al a0909 [coherent states in the multiverse].
@ And inflation: Vereshchagin JCAP(04)gq, NCB(07); Lidsey et al PRD(04)gq, Mulryne et al PRD(05)ap [lqg, oscillations]; Alberghi et al PRD(08)-a0708 [massless scalar in de Sitter, dispersion relations from Born-Oppenheimer approximation]; > s.a. inflationary models.
@ Homogeneous, isotropic: Lidsey JCAP(04)gq [lqg, cyclic]; Mulryne et al IJMPA(05)gq/04; Tan & Ma CQG(06)gq.
@ Bianchi models: Imponente & Montani IJMPD(03)gq/04 [chaos and semiclassical quantum gravity].
> Other models: see de sitter spacetime; FRW models; minisuperspace; Stephani Model.

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