Abstract
Green functions provide information on different aspects of quantum physical systems in a unified manner and their importance cannot be overemphasized. To see how a Green function may arise, suppose that ‹xt | ψ› denotes the state of a system at time t, in the x-description, as it has evolved from an initial state ‹x0|ψ›. Upon the insertion of the identity operator in (2.4.13) between ‹xt| and |ψ›, we may relate ‹xt |ψ› to the initial state as follows
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© 2006 Springer
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Manoukian, E. (2006). Green Functions. In: Quantum Theory. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-4190-7_9
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DOI: https://doi.org/10.1007/978-1-4020-4190-7_9
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-4020-4189-1
Online ISBN: 978-1-4020-4190-7
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