Why Quantum Field Theory?

  • Gerhard EckerEmail author
Part of the Undergraduate Lecture Notes in Physics book series (ULNP)


Since the beginning of quantum mechanics people have sometimes expressed concern that causality could be violated in quantum mechanics. There exist countless treatises on the concept and the consequences of causality. For the simple physicist causality is violated if information can be transmitted with velocities exceeding the speed of light. Let us consider a free, nonrelativistic particle with mass m, momentum \(\vec p\) and consequently with energy \(E = {\vec p}^{\,2}/2m\). It is a nice exercise for the student of quantum mechanics to calculate the probability amplitude for the particle to get in a given time t from a starting point \({\vec r_0}\) to an arbitrary point \(\vec r\).


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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Fakultät für PhysikUniversität WienViennaAustria

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