%0 Journal Article %T The initial state of heavy-ion collisions %A Javier L. Albacete %A Adrian Dumitru %A Cyrille Marquet %J Physics %D 2013 %I arXiv %R 10.1142/S0217751X13400101 %X We present a brief review of recent theoretical developments and related phenomenological approaches for understanding the initial state of heavy-ion collisions, with emphasis on the Color Glass Condensate formalism. %U http://arxiv.org/abs/1302.6433v1