• [1]

    S. Carlip, Quantum Gravity in 2+1 Dimensions, Cambridge Monographs on Mathematical Physics, (Cambridge University Press, 2003)

  • [2]

    A. Achucarro and P. K. Townsend, Phys. Lett. B, 180:89(1986)

  • [3]

    E. Witten, Nucl. Phys. B, 311:46(1988)

  • [4]

    M. Banados, C. Teitelboim, and J. Zanelli, Phys. Rev. Lett., 69:1849-1851(1992)

  • [5]

    S. Carlip, Class. Quant. Grav., 22:R85-R124(2005)

  • [6]

    S. Carlip, Phys. Rev. D, 51:632-637(1995)

  • [7]

    O. Coussaert, M. Henneaux, and v. D. Peter, Class. Quant. Grav., 12:2961-2966(1995)

  • [8]

    M. Rooman and P. Spindel, Nucl. Phys. B, 594:329-353(2001)

  • [9]

    J. L. Cardy, Nucl. Phys. B, 270:186-204(1986)

  • [10]

    H. W. J. Blote, J. L. Cardy, and M. P. Nightingale, Phys. Rev. Lett., 56:742-745(1986)

  • [11]

    J. D. Brown and M. Henneaux, Commun. Math. Phys., 104:207-226(1986)

  • [12]

    A. Strominger, JHEP, 02:009(1998)

  • [13]

    D. Birmingham, I. Sachs, and S. Sen, Phys. Lett. B, 424:275-280(1998)

  • [14]

    J. Wang, Y. Ma, and X.-A. Zhao, Phys. Rev. D, 89:084065(2014)

  • [15]

    J. Wang, The Entropy of BTZ Black Hole from Loop Quantum Gravity, (2014)

  • [16]

    J. Wang and C.-G. Huang, Class. Quant. Grav., 32:035026(2015)

  • [17]

    J. Wang, C.-G. Huang, and L. Li, Chin. Phys. C, 40(8):083102(2016)

  • [18]

    J. Wang and C.-G. Huang, Int. J. Mod. Phys. D, 25(14):1650100(2016)

  • [19]

    C.-G. Huang and J. Wang, Gen. Rel. Grav., 48(8):115(2016)

  • [20]

    C.-G. Huang and J. Wang, Chin. Sci. Bull (in Chinese), 60:3313-3321(2015)

  • [21]

    W. Ogura, Phys. Lett. B, 229:61-66(1989)

  • [22]

    S. Carlip, Nucl. Phys. B, 362:111-124(1991)

  • [23]

    S. Carlip, Nucl. Phys. Proc. Suppl., 57:8-12(1997)

  • [24]

    A. Ashtekar, J. Wisniewski, and O. Dreyer, Adv. Theor. Math. Phys., 6:507-555(2003)

  • [25]

    E. Newman and R. Penrose, J. Math. Phys., 3(5):566-578(1962)

  • [26]

    X.-G. Wen, Phys. Rev. B, 41:12838-12844(1990)

  • [27]

    G. Barnich and H. A. Gonzalez, JHEP, 05:016(2013)

  • [28]

    H. Afshar, S. Detournay, D. Grumiller, W. Merbis, A. Perez, D. Tempo, and R. Troncoso, Phys. Rev. D, 93(10):101503(2016)

  • [29]

    H. Afshar, D. Grumiller, and M. M. Sheikh-Jabbari, Phys. Rev. D, 96(8):084032(2017)

  • [30]

    M. Banados, Phys. Rev. Lett., 82:2030-2033(1999)

  • [31]

    H. Afshar, D. Grumiller, M. M. Sheikh-Jabbari, and H. Yavartanoo, JHEP, 08:087(2017)

  • [32]

    E. Witten, Three-Dimensional Gravity Revisited, (2007)

  • [33]

    S. Carlip, AIP Conf. Proc., 1483:54-62(2012)

  • [34]

    S. Carlip, Class. Quant. Grav., 32(15):155009(2015)