Top Network Posts
- 25What does it mean for a Hamiltonian or system to be gapped or gapless?
- 11Is there a relativistic (quantum) thermodynamics?
- 9To calculate the correlation functions of an XX spin chain, Wick's theorem is used. But is it valid for a chain of any size?
- 9Questions about the Dyson equation
- 7Once a quantum partition function is in path integral form, does it contain any operators?
- 6Can the work done between two non-equilibrium states be calculated?
- 5What's the definition of the time ordering operator for more than two particles?
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