Analytic three-dimensional primary hair charged black holes with Coulomb-like electrodynamics and their thermodynamics
arxiv(2024)
摘要
We construct and discuss new solutions of primary hair charged black holes in
asymptotically Anti-de Sitter (AdS) space that have well-defined Coulomb-like
potential in three dimensions. The gauge field source to the Einstein equation
is a power-Maxwell nonlinear electrodynamics with traceless energy-momentum
tensor. The coupled Einstein-power-Maxwell-scalar gravity system, which carries
the coupling f(ϕ) between the gauge and scalar fields, is analyzed, and
hairy charged black hole solutions are found analytically. We consider three
different profiles of the coupling functions: (i) f(ϕ)=1, corresponding to
no direct coupling between the gauge and scalar fields, (ii)
f(ϕ)=e^ϕ, and (iii) f(ϕ)=e^ϕ^2/2, corresponding to their
non-minimal coupling. For all these cases, the scalar field, gauge fields, and
curvature scalars are regular and well-behaved everywhere outside the horizon.
We further study the thermodynamics of the obtained hairy black hole in the
canonical and grand-canonical ensembles and find significant changes in its
thermodynamic structure due to the scalar field. In particular, for all
considered coupling functions, the hairy parameter has a critical value above
which the hairy black hole undergoes the Hawking/Page phase transition, whereas
below which no such phase transition appears.
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