@article{AIHPA_1999__70_1_23_0, author = {Borchers, H. J. and Buchholz, D.}, title = {Global properties of vacuum states in de {Sitter} space}, journal = {Annales de l'I.H.P. Physique th\'eorique}, pages = {23--40}, publisher = {Gauthier-Villars}, volume = {70}, number = {1}, year = {1999}, zbl = {0916.53045}, mrnumber = {1671209}, language = {en}, url = {http://archive.numdam.org/item/AIHPA_1999__70_1_23_0/} }