Three-Dimensional Einstein-Gauss-Bonnet Black Holes with Quintessence

Abstract

In this paper, we examine three-dimensional Einstein-Gauss-Bonnet black holes with quintessential matter, obtaining exact solutions that extend the BTZ metric through higher-curvature terms and quintessence coupling. The solutions exhibit a single event horizon whose radius decreases with increasing quintessence parameter $\omega_q$, while developing a curvature singularity at the origin for non-vanishing quintessence. The geodesic analysis reveals stable circular photon orbits exist exclusively for phantom-like quintessence ($\omega_q < -1$), unaffected by the Gauss-Bonnet coupling $\alpha$. Thermodynamically, the system is stable, since the specific heat is positive, and with evaporation it evolves to stable remnants whose characteristic size decreases as $\omega_q$ increases, with complete evaporation prevented by quintessence effects. These results demonstrate the profound influence of quintessential matter on both geometric and thermodynamic properties of (2+1)-dimensional black holes, offering new perspectives on gravitational theories in lower dimensions and black hole final states.

Keywords: Einstein-Gauss-Bonnet, Low dimensional systems, Quintessence, Black holes.