Dilatonic black holes with a Gauss-Bonnet term

Takashi Torii, Hiroki Yajima, Keiichi Maeda

    Research output: Contribution to journalArticle

    119 Citations (Scopus)

    Abstract

    We discuss black holes in an effective theory derived from a superstring model, which includes a dilaton field, a gauge field, and the Gauss-Bonnet term. Assuming U(1) or SU(2) symmetry for the gauge field, we find four types of spherically symmetric solutions, i.e., a neutral, an electrically charged, a magnetically charged, and a "colored" black hole, and discuss their thermodynamical properties and fate via the Hawking evaporation process. For neutral and electrically charged black holes, we find a critical point and a singular end point. Below the mass corresponding to the critical point, no solution exists, while the curvature on the horizon diverges and a naked singularity appears at the singular point. A cusp structure in the mass-entropy diagram is found at the critical point and black holes on the branch between the critical and singular points become unstable. For magnetically charged and "colored" black holes, the solution becomes singular just at the end point with a finite mass. Because the black hole temperature is always finite even at the critical point or the singular point, we may conclude that the evaporation process will not be stopped even at the critical point or the singular point, and the black hole will move to a dynamical evaporation phase or a naked singularity will appear.

    Original languageEnglish
    Pages (from-to)739-753
    Number of pages15
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Volume55
    Issue number2
    Publication statusPublished - 1997 Jan 15

    Fingerprint

    Gauss
    Black Holes
    Critical point
    critical point
    Singular Point
    Term
    Evaporation
    naked singularities
    evaporation
    Gauge Field
    End point
    Singularity
    Superstring
    Singular Solutions
    Dilaton
    Symmetric Solution
    Cusp
    Diverge
    cusps
    horizon

    ASJC Scopus subject areas

    • Mathematical Physics
    • Physics and Astronomy(all)
    • Nuclear and High Energy Physics
    • Physics and Astronomy (miscellaneous)

    Cite this

    Dilatonic black holes with a Gauss-Bonnet term. / Torii, Takashi; Yajima, Hiroki; Maeda, Keiichi.

    In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 55, No. 2, 15.01.1997, p. 739-753.

    Research output: Contribution to journalArticle

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