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This is a Quantitative Study study.

October 10, 2025Physical Review ResearchOpen Access

Ladder equation for the three-particle vertex and its approximate solution

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Generalization of two-particle equations reveals limits in approximation, suggesting improvement for weak interactions.

The ladder equation for the three-particle vertex offers a new perspective on complex interactions, and its approximation is insightful.
Comparing the approximate solution to the exact solution highlights the challenges in modeling weak interactions accurately.
Using a combination of two-particle irreducible vertices reveals limitations in the approximation for the nonlinear response function.
The findings indicate that while approximations are useful, they often yield qualitative results under specific conditions.

Kappl et al. (2025) studied this question.

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