Non-exponential decay in Quantum Mechanics and Quantum Field Theory

16th Symmetries in Science

Giacosa, Francesco^1

Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, Max von Laue-Str. 1, Frankfurt

D-60438, Germany^1

关键词: Decay channels;    Decay probability;    Exponential decays;    Hamiltonian approach;    Nonexponential decays;    Quantum field theory;    Salient features;    Time deviation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/538/1/012008/pdf
DOI  :  10.1088/1742-6596/538/1/012008

来源: IOP

【 摘 要 】

We describe some salient features as well as some recent developments concerning short-time deviations from the exponential decay law in the context of Quantum Mechanics by using the Lee Hamiltonian approach and Quantum Field Theory by using relativistic Lagrangians. In particular, the case in which two decay channels are present is analyzed: the ratio of decay probability densities, which is a constant equal to the ratio of decay widths in the exponential limit, shows in general sizable fluctuations which persist also at long times.