Marcos Valdés (Scuola Normale Superiore di Pisa) title : "The high-z interplay between annihilating DM and the IGM" abstract : "We study the interactions of some of the most popular annihilating/decaying Dark Matter (DM) candidates with the Inter-Galactic Medium (IGM) during the so called Dark Ages of the Universe, i.e. during the extended epoch between Cosmic Recombination and Reionization at redshift z ≈ 1100, z ≈ 10 respectively. DM decays/annihilations will modify the thermal and ionization history of the IGM, possibly leaving an observable trace on a number of observable frequencies such as (i) the radio HI 21 cm line; (ii) X and gamma rays; (iii) microwave by modifications to the CMB power spectrum. |