|  3-Dimensional Massive Gravity Theories | 
In General > s.a. 3D gravity theories.
  * Idea: Theories obtained by
    adding to Einstein's gravity the usual Fierz-Pauli, or the more complicated
    Ricci scalar squared (R2),
    terms, are tree level unitary, but have their unitarity spoiled when
    a Chern-Simons term  is added (topologically massive).
  @ General references: Bañados & Theisen JHEP(09) [as bimetric gravity, and black holes];
    Grigore & Scharf a1008;
    Sadegh & Shirzad PRD(11)-a1010 [constraint structure];
    Zinoviev CQG(13)-a1205 [and bigravity];
    Hohm et al PRD(12)-a1208 [Chern-Simons-like action, and Hamiltonian];
    Edelstein et al PRD(17)-a1602 [causality];
    Mishra a2005-MSc.
  @ Black holes:
    Ayón-Beato et al PRD(09) [Lifshitz metrics];
    Tonni JHEP(10)-a1006 [warped black holes];
    Ghodsi & Moghadassi PLB(11)-a1007,
    Flory & Sachs PRD(13)-a1304,
    Kwon et al JHEP(13)-a1308 [new massive gravity].
Topologically Massive Gravity
  > s.a. 3D quantum gravity; bel-robinson tensor;
  Faddeev-Jackiw Method; massive gravity.
  * Idea: Three-dimensional
    gravity with a cosmological constant and a gravitational Chern-Simons term.
  * Action: The Einstein action (≅
    ISO(2,1) Chern-Simons) plus a conformal gravity term (≅ SO(2,1)-Chern-Simons
    or SO(3)-Chern-Simons).
  * Field equations: If m is the
    topological coupling constant, and C the (traceless) Cotton tensor, then
Gab + m−1 Cab = −k Tab ;
    Notice that, since Cab contains
    derivatives of Rab, the field
    equations are third-order; It propagates a single massive spin-2 graviton mode.
  * Drawback: One of the two (left/right)
    central charges of the corresponding putative boundary cft can be shown to be negative
    whenever the bulk AdS graviton has positive energy, which is inconsistent with quantum unitarity.
  @ General references: Peldán CQG(92);
    Deser et al NPB(94)ht/93 [particle scattering amplitudes];
    Accioly & Dias IJMPA(06)ht/05 [non-unitarity];
    Grumiller & Jackiw a0802-wd [with Λ < 0, and complex Chern-Simons terms];
    Grumiller et al a0806-in [cosmological, at the chiral point];
    Carlip et al PLB(08)-a0807,
    Carlip JHEP(08)-a0807 [in AdS spacetime, constraint algebra];
    Giribet et al JHEP(08)-a0807 [and chirality];
    Grumiller & Johansson JHEP(08) [chiral point instability];
    Oda a0905 [renormalizability];
    Lashkari & Maloney CQG(11)-a1007 [and Ricci-Cotton Flow];
    Grumiller & Vassilevich JHEP(10)-a1007 [graviton 1-loop partition function];
    > s.a. energy positivity.
  @ Canonical formulation: Hotta et al JHEP(08)-a0805 [Brown-Henneaux approach];
    Blagojević & Cvetković JHEP(09)-a0812 [with cosmological constant];
    Mišković & Olea JHEP(09)-a0909 [background-independent charges];
    > s.a. symplectic structures.
  @ Black holes: Dereli & Sarioglu gq/00;
    Birmingham et al PRD(10)-a1006 [BTZ black hole, stability];
    Flory & Sachs PRD(13)-a1304 [non-stationary exact solution];
    Troessaert et al a1512-ln [and gravitational waves];
    > s.a. black-hole perturbations.
  @ Other solutions: Nutku & Baekler AP(89) [homogeneous, anisotropic];
    Clément CQG(90) [point sources];
    Ortiz AP(90) [homogeneous],
    CQG(90) [spinning sources];
    Edery & Paranjape PLB(97),
    PLB(97)gq [localized mass and spin];
    Dereli & Sarioglu PLB(00)gq [+ Maxwell-Chern-Simons, self-dual];
    Henneaux et al PRD(09)-a0901 [asymptotically AdS spacetimes];
    Chow et al CQG(10)-a0906 [classification];
    Ertl et al CQG(10)-a1006 [stationary axisymmetric];
    Henneaux et al PRD(11)-a1108 [asymptotically warped AdS spacetimes];
    Moon & Myung PRD(12)-a1111 [polarization modes of gravitational waves];
    > s.a. anti-de sitter spacetime; Kundt Spacetimes.
Quantum Theory > s.a. 3D quantum gravity.
  @ Topologically massive gravity:
    Deser & Yang CQG(90) [1-loop renormalizability];
    Castro et al JHEP(11)-a1105 [with positive cosmological constant].
Other Theories > s.a. 3D gravity theories [massive 3D supergravity].
  * Minimal massive gravity: A theory
    that may be considered a variation on topologically massive gravity, and also propagates
    a single massive spin-2 graviton mode, but in which the field equations are not the
    Euler-Lagrange equations of any action constructed only from the metric, and are
    nevertheless consistent; Both central charges of the dual cft are positive, and it
    also seems possible to consistently couple matter.
  * Other variants of topologically massive
    gravity: Various higher-derivative modifications  have been proposed to circumvent
    the negative-central-charge problem but, except for Minimal Massive Gravity they have
    always introduced additional, unphysical degrees of freedom.
  @ Minimal massive 3D gravity: 
    Bergshoeff et al CQG(14)-a1404
    and CQG+;
    Tekin PRD(14)-a1409 [excitations and conserved charges];
    Alishahiha et al JHEP(14)-a1409;
    Setare NPB(15)-a1412 [in 3D AdS background];
    Yekta PRD(15)-a1503 [Hamiltonian formalism].
  @ Variants of topologically massive gravity:
    Chen et al PLB(11)-a1106,
    Bagchi et al JHEP(11)-a1107 [spin-3];
    Chen & Long JHEP(11);
    > s.a. dirac fields in curved spacetimes; supergravity.
  @ Other theories: Bergshoeff et al PRL(09)-a0901
      [higher-order theory, and massive Pauli-Fierz];
    Paulos PRD(10)-a1005 [with curvature corrections];
    Afshar et al JHEP(14)-a1405 [extended];
    Geiller & Noui a1812 [simple theory, triad variables].
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