Speaker
Description
Since the first discovery of gravitational waves resulting from a binary black hole coalescence, the study of the post-merger phase, known as ringdown, has proven to be one of the most promising tools for testing gravity and exploring fascinating extensions of general relativity. In this talk I will discuss one of these extensions, called Einstein-Maxwell-scalar theory, where a scalar field is minimally coupled to gravity and non-minimally coupled to Maxwell. In addition to the usual Reissner-Nordstrom solutions this theory also admits BH solutions with scalar hair. I will explore how black hole spectroscopy and the investigation of the quasi-normal modes of these solutions offer a valuable pathway to observe deviations from general relativity, potentially revealed through the presence of long-lived modes emerging in the final stage of the ringdown signal.