Abstract
The origin and evolution of magnetic fields in the Universe is one of the most fascinating and currently unsolved problems in astrophysics. The existence of kpc-scale fields, in particular, raises several problems because of the need of amplification mechanisms acting with large efficiency on large scales. Clusters of galaxies, being the largest systems in the Universe, represent an ideal laboratory to test theories for the origin of extragalactic magnetic fields. Magnetic fields are investigated in the radio band from studies of the diffuse synchrotron emission and from the rotation measure of polarized radio sources. Observations show that cluster fields are at the μG level, with values up to tens of μG at the center of cooling core clusters. The origin of these magnetic fields is still debated. The SKA will deliver new data to address currently unaswered questions about magnetic fields in clusters and map the origin and evolution of magnetized structures in the Universe.
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