Influence of the future

Fundamental issues concerned with time, both the possible connection of the thermodynamic and cosmological arrows and the possibility of retrocausality, are analyzed using a two-time boundary value formulation. Ways in which the future fate of the universe could leave observable traces today are suggested. Finally, if the definiteness of quantum measurement arises from the occurrence of “special states” then the best existing candidate to justify the presence of those states is the demand for nonentanglement in the far future and far past.