Particle creation near the chronology horizon

We investigate the phenomenon of particle creation of the massless scalar field in the model of spacetime in which, depending on the model’s parameter ao, the chronology horizon could be formed. The model represents a two-dimensional curved spacetime with the topology R × S which is asymptotically flat in the past and in the future. The spacetime is globally hyperbolic and has no causal pathologies if ao < 1, and closed timelike curves appear in the spacetime if ao ≥ 1. We obtain the spectrum of created particles in the case ao < 1. In the limit ao → 1 this spectrum gives the number of particles created into mode n near the chronology horizon. The main result we have obtained is that the number of scalar particles created into each mode as well as the full number of particles remain finite at the moment of forming of the chronology horizon.