Active galactic nuclei (AGN) produce the highest intrinsic luminosities in the Universe\nfrom within a compact region. The central engine is thought to be powered by accretion onto a\nsupermassive black hole. A fraction of this huge release of energy influences the evolution of the\nhost galaxy, and in particular, star formation. Thus, AGN are key astronomical sources not only\nbecause they play an important role in the evolution of the Universe, but also because they constitute\na laboratory for extreme physics. However, these objects are under the resolution limit of current\ntelescopes. Polarimetry is a unique technique capable of providing us with information on physical\nAGN structures. The incoming new era of X-ray polarimetry will give us the opportunity to explore\nthe geometry and physical processes taking place in the innermost regions of the accretion disc.\nHere we exploit this future powerful tool in the particular case of changing-look AGN, which are key\nfor understanding the complexity of AGN physics.
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