CORRELATION FUNCTIONS IN BLACK HOLES AND WHITE HOLES FORMED BY BOSE-EINSTEIN CONDENSATES

C. MAYORAL (IN COLLABORATION WITH r. BALBINOT, I. CARUSOTTO, A. FABBRI, R. PARENTANI, A-RECATI)

We compare the correlations functions related to Hawking pair production in black holes and white holes configurations formed in Bose-Einstein condensates. It is shown that, unilke in the black hole case, in the white hole there are correlations which grow in time signalling some sort of instability.