The Origin of Cosmic Magnetic Fields: A Current Perspective
Salome Mtchedlidze (DIFA - Università di Bologna)
Tuesday 04/03/2025 @ 14:00, Sala Antonio Sollima (IV piano Battiferro)
The magnetisaton of our universe on galaxy and galaxy cluster scales, and in the recent years revealed on filamentary scales as well, raises interest in understanding its origin. The blazar spectra observations provide an intriguing possibility of the existence of magnetic fields in cosmic voids. This motivates us not only to explore their origin but also to predict their structure on these vast scales. If large-scale magnetism originates from fields generated in the late Universe — during reionization and structure formation — such fields might influence the magnetisation and possibly the evolution of the intracluster and intergalactic medium. On the other hand, if magnetic fields are primordial, generated in the pre-recombination Universe, they can naturally permeate the entire Universe and leave imprints on various cosmological phenomena (e.g., on the Cosmic Microwave Background spectra, propagation of high-energy gamma rays, relic gravitational waves, etc). In this talk, I will summarise physics associated to cosmic magnetism and present our research work results.