Two-Loop Diagrams in Causal Perturbation Theory
نویسندگان
چکیده
منابع مشابه
Two–loop integrals in chiral perturbation theory
We consider chiral perturbation theory in the meson sector at order E 6. In the terminology of the external field technique, the two–loop graphs so generated are of the sunset type. We discuss the evaluation of several of these in the case where the masses of the particles running in the loops are equal. In particular, we present integral representations that are suitable for the evaluation of ...
متن کاملRenormalization of two - loop diagrams in scalar lattice field theory
We present a method to calculate to very high precision the coefficients of the divergences occuring in two-loop diagrams for a massive scalar field on the lattice. The approach is based on coordinate space techniques and extensive use of the precisely known Green’s function.
متن کاملARCHIVES Problems with causal-loop diagrams
Founded in the mid1950s, the field of system dynamics has intellectual roots reaching much further into the past. The Archives section of the Review seeks to publish material from that past which can contribute to current theory and practice. The section welcomes previously unpublished but deserving system dynamics work, classics from past system dynamics literature that should receive renewed ...
متن کاملOptimized Perturbation Theory at Finite Temperature Two-Loop Analysis
We study the optimized perturbation theory (OPT) at finite temperature, which is a selfconsistent resummation method. Firstly, we generalize the idea of the OPT to optimize the coupling constant in λφ theory, and give a proof of the renormalizability of this generalized OPT. Secondly, the principle of minimal sensitivity and the criterion of the fastest apparent convergence, which are condition...
متن کاملPerturbation theory without diagrams: the polaron case.
Higher-order perturbative calculations in quantum (field) theory suffer from the factorial increase of the number of individual diagrams. Here I describe an approach which evaluates the total contribution numerically for finite temperature from the cumulant expansion of the corresponding observable followed by an extrapolation to zero temperature. This method (originally proposed by Bogolyubov ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Annals of Physics
سال: 1997
ISSN: 0003-4916
DOI: 10.1006/aphy.1997.5686