Charged soliton--black hole phase transitions in three-dimensional Einstein--Gauss--Bonnet gravity
Abstract
We construct a magnetic soliton by double Wick rotating the static electrically charged black hole in three-dimensional Einstein--Gauss--Bonnet gravity. We match the boundary metrics and Maxwell sources under the chosen boundary condition and compute the difference of the renormalized Euclidean actions. Because the Maxwell potential grows logarithmically at infinity, the chosen finite Maxwell boundary term changes both the fixed Maxwell source and the renormalized action. The charge contributions for both the soliton and the black hole appear with plus signs in ΔI(cfin). For the grand-canonical boundary condition cfin=1, the black-hole and soliton branches can cross with different slopes. For the example considered below, the black-hole branch satisfying the response conditions ends at a maximum temperature, and the coexistence curve has a T→0+ endpoint at two opposite values of the spatial Maxwell source. At a nonextremal crossing, the entropy difference is Sb−Ss=Sb. For these two static solutions, equality of both current components requires both charges to vanish.
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BibTeX
@misc{suryaatmadja2026charged,
title = {{Charged soliton--black hole phase transitions in three-dimensional Einstein--Gauss--Bonnet gravity}},
author = {Cendikiawan Suryaatmadja and Robert Mann},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.07748},
eprint = {2610.07748},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.07748},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Charged soliton--black hole phase transitions in three-dimensional Einstein--Gauss--Bonnet gravity
AU - Cendikiawan Suryaatmadja
AU - Robert Mann
PY - 2026
DA - 2026/10/08
PB - arXiv
DO - 10.48550/arxiv.2610.07748
UR - https://arxiv.org/abs/2610.07748
AB - We construct a magnetic soliton by double Wick rotating the static electrically charged black hole in three-dimensional Einstein--Gauss--Bonnet gravity. We match the boundary metrics and Maxwell sources under the chosen boundary condition and compute the difference of the renormalized Euclidean actions. Because the Maxwell potential grows logarithmically at infinity, the chosen finite Maxwell boundary term changes both the fixed Maxwell source and the renormalized action. The charge contributions for both the soliton and the black hole appear with plus signs in ΔI^(c_fin). For the grand-canonical boundary condition c_fin=1, the black-hole and soliton branches can cross with different slopes. For the example considered below, the black-hole branch satisfying the response conditions ends at a maximum temperature, and the coexistence curve has a T→0^+ endpoint at two opposite values of the spatial Maxwell source. At a nonextremal crossing, the entropy difference is S_b−S_s=S_b. For these two static solutions, equality of both current components requires both charges to vanish.
ER -