Analog model for scalar dynamics in a Kerr–Sen background

Black holes (BH) are challenging as objects of study and measurement. The extreme conditions they produce make direct observation a formidable task. Here we provide an analog model to the dynamics of a charged scalar particle in the background of a Kerr–Sen BH, which comes from a string theory metric. This model consists in a particle constrained to move on a spherical surface that may rotate and may be in the presence of an electromagnetic field. We show that a charged scalar particle in our analog model produces the exact same dynamics of a dilaton in the Kerr–Sen space. The functions that describe the dynamics are written as confluent Heun’s functions, also match the original system.