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The weak gravity conjecture and the axionic black hole paradox

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In theories with a perturbatively massless 2-form (dual to an axion), a paradox may arise in the process of black hole evaporation. Schwarzschild black holes can support a non-trivial Wilson-line-type field, the integral of the 2-form around their horizon. After such an ‘axionic black hole’ evaporat...

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Hauptverfasser: Hebecker, Arthur (VerfasserIn) , Soler, Pablo (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: September 8, 2017
In: Journal of high energy physics
Year: 2017, Heft: 9, Pages: 36
ISSN:1029-8479
DOI:10.1007/JHEP09(2017)036
Online-Zugang:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1007/JHEP09(2017)036
Verlag, kostenfrei, Volltext: https://link.springer.com/article/10.1007/JHEP09(2017)036
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Verfasserangaben:Arthur Hebecker and Pablo Soler

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520 |a In theories with a perturbatively massless 2-form (dual to an axion), a paradox may arise in the process of black hole evaporation. Schwarzschild black holes can support a non-trivial Wilson-line-type field, the integral of the 2-form around their horizon. After such an ‘axionic black hole’ evaporates, the Wilson line must be supported by the corresponding 3-form field strength in the region formerly occupied by the black hole. In the limit of small axion decay-constant f, the energy required for this field configuration is too large. Thus, energy cannot be conserved in the process of black hole evaporation. The natural resolution of this paradox is through the presence of light strings, which allow the black hole to “shed” its axionic hair sufficiently early. This gives rise to a new Weak-Gravity-type argument in the 2-form context: small coupling, in this case f , enforces the presence of light strings or a low cutoff. We also discuss how this argument may be modified in situations where the weak coupling regime is achieved in the low-energy effective theory through an appropriate gauging of a model with a vector field and two 2-forms. 
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