Linked-cluster Tamm-Dancoff field theory

Amir H. Rezaeian, Niels R. Walet

    Research output: Contribution to journalArticlepeer-review


    To solve the relativistic bound-state problem one needs to systematically and simultaneously decouple the high-energy from the low-energy modes and the many-body from the few-particle states using a consistent renormalization scheme. In a recent Letter we have shown that one such approach can be a combination of the coupled cluster method as used in many-body theory and the Wilsonian exact renormalization group. Even though the method is intrinsically non-perturbative, one can easily implement a loop expansion within it. In this Letter we provide further support for this aspect of our formalism by obtaining results for the two-loop renormalized φ4 theory. We show that the non-unitary representation inherent in our method leads to an economic computation and does not produce any non-Hermiticity in the relevant terms. © 2003 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)129-136
    Number of pages7
    JournalPhysics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
    Issue number1-2
    Publication statusPublished - 18 Sept 2003


    • Coupled cluster
    • Renormalization group
    • Tamm-Dancoff


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