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Dilatonic (quasi-) black holes without scalar charge

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Abstract

We consider static, spherically symmetric configurations of electrically charged dust in Einstein-Maxwell-dilaton gravity where the Lagrangian contains the interaction term P(χ)F μν F μν with an arbitrary function P(χ). Unlike previous studies, we assume that the scalar field χ (which can be canonical or phantom) does not have a charge of its own and exists only due to this interaction. We discuss possible solutions to the field equations, in particular, those describing black holes (BHs) and quasi-black holes (QBHs). The latter are globally regular configurations whose size is very close to that of a BH of the same mass and which therefore are almost indistinguishable from BHs for a distant observer. Some general features are revealed, a family of explicitly integrable models is found, and some explicit examples are presented.

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Authors and Affiliations

  1. VNIIMS, Ozyornaya ul. 46, Moscow, 119361, Russia

    K. A. Bronnikov

  2. Institute of Gravitation and Cosmology, RUDN University, ul. Miklukho-Maklaya 6, Moscow, 117198, Russia

    K. A. Bronnikov & D. I. Israpilov

  3. National Research Nuclear University “MEPhI” (Moscow Engineering Physics Institute), Kashirskoe sh. 31, Moscow, 115409, Russia

    K. A. Bronnikov

Authors
  1. K. A. Bronnikov
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  2. D. I. Israpilov
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Correspondence to K. A. Bronnikov.

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Bronnikov, K.A., Israpilov, D.I. Dilatonic (quasi-) black holes without scalar charge. Gravit. Cosmol. 22, 281–287 (2016). https://doi.org/10.1134/S020228931603004X

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  • DOI: https://doi.org/10.1134/S020228931603004X

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