| 单词 | many-body problem |
| 释义 | many-body problem The problem that it is very difficult to obtain exact solutions to systems involving interactions between more than two bodies - using either classical mechanics or quantum mechanics. To understand the physics of many-body systems it is necessary to make use of approximation techniques or model systems that capture the essential physics of the problem. For some problems, such as the three-body problem in classical mechanics, it is possible to obtain qualitative information about the system. Useful concepts in the quantum theory of many-body systems are quasiparticles and collective excitations. If there are a great many bodies interacting, such as the molecules in a gas, the problem can be analysed using the techniques of statistical mechanics |
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