Lets say I have a system ψ with a Hamiltonian matrix H and energy eigenvalues E. Just a general system, with no particular basis given.(adsbygoogle = window.adsbygoogle || []).push({});

When I solve the eigenvalue equation for H, and get zero or negative numbers or zero for E, is that physical? If it is not physical, do the negative numbers or zero energy mean anything?

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# Negative energies

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