TY  - CONF
A1  - Giacosa, Francesco
T1  - Toward a QFT treatment of nonexponential decay
T2  - EPJ Web of Conferences
N2  - We study the properties of the survival probability of an unstable quantum state described by a Lee Hamiltonian. This theoretical approach resembles closely Quantum Field Theory (QFT): one can introduce in a rather simple framework the concept of propagator and Feynman rules, Within this context, we re-derive (in a detailed and didactical way) the well-known result according to which the amplitude of the survival probability is the Fourier transform of the energy distribution (or spectral function) of the unstable state (in turn, the energy distribution is proportional to the imaginary part of the propagator of the unstable state). Typically, the survival probability amplitude is the starting point of many studies of non-exponential decays. This work represents a further step toward the evaluation of the survival probability amplitude in genuine relativistic QFT. However, although many similarities exist, QFT presents some differences w.r.t. the Lee Hamiltonian which should be studied in the future.
Y1  - 2018
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/49953
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-499533
SN  - 2100-014X
VL  - 182
IS  - Article Number 02045
PB  - EDP Sciences
CY  - Les Ulis
ER  -