Black hole solutions of three dimensional E${}_6$-gravity

Abstract

This paper aims to construct exceptional Banados-Teitelboim-Zanelli (BTZ) black holes carrying E${}_6$ charges as solutions to the 3D higher spin Anti-de Sitter (AdS) gravity with E${}_6$ boundary conditions. Guided by Tits-Satake graphs of real forms of the e${}_6$ Lie algebra, we build three remarkable E${}_6$-higher spin black hole models: the linear-exceptional and the ortho-exceptional BTZ solutions result from splitting the extremal nodes in the E${}_{6\left(6\right)}$ Tits-Satake diagram while the pure exceptional-exceptional model follows from the folding down to F${}_{4\left(4\right)}$. And with the help of Hasse diagram visualizations, we study the ensuing higher spin spectrums to develop the corresponding metrics using two types of gauge transformations. For completeness, we examine the thermodynamics of the standard BTZ coupled to E${}_6$ higher spin gravity fields by computing the partition function exploiting a one to one correspondence between the factors of the vacuum characters and the roots of the E${}_6$ root system.

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