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3D frame stiffness matrix local to global

I am working on a simple script to be able to solve frame structure using direct stiffness method. I am having following stiffness matrix for 2 node frame element: What is the correct way of ...
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Colour decomposition in QCD

I am looking to compute the matrix element for the process gg -> u ubar at leading order. It is straightforward to calculate the non-colour part of the usual s, t and u channels. I will call these ...
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Decay Amplitudes Notation

This question is mostly about how to interpret notation used in Particle Physics. I am given that at lowest order the rate of $b\rightarrow s\gamma$ is proportional to $\langle B_p|b^\dagger ...
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matrix elements of the electronic molecular Hamiltonian between a hartree product and a Slater determinant

This may belong in Chemistry, but I thought I might try my luck here first. In Szabo's book, an exercise requires a proof that = (N!)^(1/2) * given that |K(HP)> is the Hartree product wave ...
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Matrix element of an operator

Suppose we want to calculate the following matrix element. $$ \langle \alpha |\hat{o}|\beta\rangle $$ Where $\alpha$ and $\beta$ are two arbitrary basis states in a many-particle basis set, and ...
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Expanding Operator - Renormalization Group for SIAM

im currently reading a paper about renormalization group theory, especially for the single impurity anderson model. There occurs the approach do expand some fermionic operators via a ...