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In this talk, we review recent studies of Extreme mass-ratio inspirals (EMRIs) in the presence of additional scalar fields (2106.11325 and 2004.11895). Owing to no-hair theorems, the scalar effects on supermassive black holes are typically negligible, allowing a simplified perturbative modeling in which the small object may carry a scalar charge. This scalar charge can leave observable imprints on the gravitational waveform.
Complementary data-driven analyses show that the future space-based detector LISA will be capable of detecting and measuring such scalar charges with percent-level accuracy, largely independent of the underlying scalar field model. These results highlight EMRIs as promising probes of beyond-GR physics and new fundamental fields.