IX Mexican School on Gravitation and Mathematical Physics [electronic resource] : cosmology for the XXIst century : Puerto Vallarta, Jalisco, Mexico, 3-7 December 2012 / Gravitation and Mathematical Physics Division of the Mexican Physical Society (DGFM-SMF) ; editor[s], Luis A. Ureña-López (University of Guanajuato, Mexico), Ricardo Becerril-Bárcenas (Michoacan University of San Nicolás de Hidalgo, Michoacan, Mexico), Román Linares-Romero (Iztopalapa Metropolitan Autonomous University, Mexico City, Mexico) ; sponsoring organizations, Mexican National Science and Technology Council (CONACyT) [and eight others].