| Title: | Separability of the Dirac equation in the STU black hole spacetime : Pairwise-equal charge case study |
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| Authors: | ID Cvetič, Mirjam (Author)
ID Stetsko, M. M. (Author) |
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| Files: |  Cveti-2023-Separability_of_the_Dirac_equation.pdf (373,36 KB)
MD5: CCC836C69CE677CB4C14EE95755ADFA3
 https://doi.org/10.1103/PhysRevD.108.085020
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| Language: | English |
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| Work type: | Scientific work |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UM - University of Maribor
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| Abstract: | We study the separability of the Dirac equation in the background of four dimensional charged rotating asymptotically flat black hole solution of supergravity and the low energy string theory known as STU black hole. In particular, we analyze in detail the separability conditions in the pairwise equal charge STU black hole space-time [M. Cvetič and D. Youm, Phys. Rev. D 54, 2612 (1996).]. While in the latter case the minimally coupled Dirac equation is not separable, the introduction of a specific torsion term ensures the separability. The source of the torsion is the Kalb-Ramond field, which is an integral part of string theory, but further aspects of its properties and coupling to fermionic fields remain to be studied. To derive the torsion, two different approaches are used in conformally related frames, showing that the torsion is not unique. The correspondingly modified Dirac equations in the Einstein and string frames are shown to be separable. Furthermore, the massless radial and angular wave equations are examined; they show close similarity with corresponding equations for the standard Kerr background. A generalization of the Teukolsky equation for the pairwise equal case is conjectured. We also briefly analyze a technically sophisticated radial equation in the massive case. |
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| Keywords: | quantum fields of spacetime, supergravity, curved spacetime, Dirac equation |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 15.08.2023 |
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| Article acceptance date: | 24.09.2023 |
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| Publication date: | 25.10.2023 |
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| Publisher: | American Physical Society |
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| Year of publishing: | 2023 |
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| Number of pages: | Str- 1-21 |
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| Numbering: | Letn. 108, Št. 8, št. članka 085020 |
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| PID: | 20.500.12556/DKUM-89550  |
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| UDC: | 530.145 |
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| ISSN on article: | 2470-0029 |
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| COBISS.SI-ID: | 192745987 |
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| DOI: | 10.1103/PhysRevD.108.085020 |
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| Publication date in DKUM: | 19.07.2024 |
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| Views: | 358 |
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| Downloads: | 25 |
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| Metadata: |    |
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| Categories: | Misc.
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