Effect phase transition of Kerr-Sen Black Holes

This study explores the thermodynamic geometry of Kerr-Sen black holes, applying the Ruppeiner geometry framework to analyze their phase transitions and stability. Through this approach, critical points indicative of phase transitions, akin to those found in conventional thermodynamic systems like the Van der Waals gas, are identified. These critical points, characterized by divergences in the curvature scalar, signify transitions between various rotational and charged phases of Kerr-Sen black holes. Additionally, the influence of string theory parameters, such as the dilaton field, on the thermodynamic behavior of these black holes is highlighted, emphasizing the connection between black hole physics and the foundational aspects of string theory. By drawing parallels between the phase transition properties of Kerr-Sen black holes and Van der Waals gases, this study underscores the universality of thermodynamic principles across both terrestrial and cosmic scales. Our findings not only deepen the understanding of Kerr-Sen black hole thermodynamics but also suggest potential observational signatures, bridging theoretical physics with astrophysical phenomena.