Physics – Quantum Physics
Scientific paper
2010-11-24
Eur. J. Phys. 32 (2011) 1311
Physics
Quantum Physics
10 pages, 4 figures; heuristic argument simplified, different example discussed, calculation of decay rate added
Scientific paper
10.1088/0143-0807/32/5/019
Gamow's explanation of the exponential decay law uses complex "eigenvalues" and exponentially growing "eigenfunctions". This raises the question, how Gamow's description fits into the quantum mechanical description of nature, which is based on real eigenvalues and square integrable wave functions. Observing that the time evolution of any wave function is given by its expansion in generalized eigenfunctions, we shall answer this question in the most straightforward manner, which at the same time is accessible to graduate students and specialists. Moreover the presentation can well be used in physics lectures to students.
Dürr Detlef
Grummt Robert
Kolb Martin
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