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Quantum mechanics describes the microscopic properties of nature in a regime where classical mechanics no longer applies. It explains phenomena such as the wave-particle duality, quantization of energy, and the uncertainty principle and is generally used in single-body systems. Use the quantum-field-theory tag for the theory of many-body quantum-mechanical systems.

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Deriving Nakajima–Zwanzig

I would like help on one step of the derivation of the Nakajima–Zwanzig equations. Specifically given the below equations: $${\partial_t}\left( \begin{matrix} \mathcal{P} \\ \mathcal{Q} \\ \en …
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1 vote

Why energy expectation values (Energy) are functions of coefficients of corresponding trial ...

I don't think I have a physical interpretation. But I like to think about it as a two-step process: i. Showing that the expectation value of the energy for the ground state wavefunction is the lowest …
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