%0 Journal Article %A Kay, Bernard %T Application of linear hyperbolic PDE to linear quantum fields in curved spacetimes : especially black holes, time machines and a new semi-local vacuum concept %J Journées équations aux dérivées partielles %D 2000 %P 1-19 %I Université de Nantes %U http://www.numdam.org/item/JEDP_2000____A9_0/ %G en %F JEDP_2000____A9_0