[Pw_forum] Hessian of the charge density

[shekoufe khosravi]

Dear Prof. Baroni
Excuse me if I was hasty.
I mean the Hessian matrix(second-order partial derivatives) of the charge
density
(as a scalar field) in the unit cell (at FFT points).

Thanks for your attention

(Mrs.) shekoufe Khosravi
PhD student
Isfahan University of Technology
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