332 citations · 1.9k across the 96 of their papers we have counts for
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math-ph2010
Dalgarno-Lewis Method Revisited
A. B. Balantekin, A. Malkus
Proving the existence of an operator that connects non-perturbed states to perturbed states, an alternative derivation of the Dalgarno-Lewis method is given. To illustrate that the…
math-ph2010★ 10 cited
Character Expansions in Physics
A. B. Balantekin
Expanding products of invariant functions of a group element as a series in the basis of characters of the irreducible representations of a group is widely used in many areas of ph…