New analytic solutions of non-SUSY black branes in $10$-D heterotic supergravity and the phase transition

Abstract: In the exploration of the vast string landscape, we provide new analytic solutions of non-SUSY black branes in 10-D heterotic supergravity which exhibit a phase transition. Our black brane solutions carry two kinds of gauge charges but still are exact, which extends the recent developments in classification of heterotic branes. The solutions offer a novel method to embed previously known noncritical 2-D or 3-D solutions to the critical dimensions. Furthermore, by performing a perturbative analysis of the non-Abelian gauge field on this exact background, we analytically find that as the temperature decreases, a spontaneous symmetry breaking occurs, leading to a dynamical instability accompanied by gauge field condensation. This instability embodies a phase transition of black branes in heterotic supergravity, and analytically predicts the existence of unknown black hole solutions to be unveiled. Our results suggest that phase transition phenomena can be used to explore and analyze the phase structure of black hole solutions, for systematically discovering and classifying stringy black holes.