München 2009 – scientific programme

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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik

MP 12: Quantenfeldtheorie und Kosmologie

MP 12.3: Talk

Thursday, March 12, 2009, 16:40–17:00, M010

Cosmological Particle Creation in States of Low Energy — •Andreas Degner — Institut für Theoretische Physik, Universität Leipzig

For the quantized linear scalar field on Friedman-Robertson-Walker spacetimes, states of low energy provide a well-motivated class of reference states. The low-energy property is approximately localized at some value of the cosmological time parameter. We present calculations of the relative particle production between a state of low energy at early time and another such state at later time. In an exponentially expanding universe, we find that the particle production may show oscillations with respect to the energy modes. The basis of the method for calculating the relative particle production is, in contrast to previously investigated approaches, completely rigorous. Approximations are only used at the level of numerical calculation.