A comprehensive approach to the euro-area crisis: Background calculations

This background paper describes in detail the assumptions and calculations behind the results presented in Zsolt Darvas, Jean Pisani-Ferry and André Sapir "A comprehensive approach to the euro-area debt crisis", Bruegel Policy Brief No 2011/02, February 2011. An assessment of the results and policy conclusions can be found in the Policy Brief.

Loop Calculations: Summary

Current and future colliders will provide high precision experimental data. In order to use the high experimental precision it has to be matched with theoretical predictions at the same level of accuracy or better. This involves the calculation of loop corrections at increasingly higher order. We briefly review the status of the field, especially in view of the calculations presented at this conference. We give an outlook about the theoretical requirements for the anticipated precision of a future e+e- linear collider.Comment: 7 pages, 2 figure

Multiloop calculations in HQET

Recently, algorithms for calculation of 3-loop propagator diagrams in HQET and on-shell QCD with a heavy quark have been constructed and implemented. These algorithms (based on integration by parts recurrence relations) reduce an arbitrary diagram to a combination of a finite number of basis integrals. Here I discuss various ways to calculate non-trivial bases integrals, either exactly or as expansions in epsilon. Some integrals of these two classes are related to each other by inversion, which provides a useful cross-check.Comment: Talk at ACAT'2002 (Moscow

Progress in multiloop calculations

I briefly summarize the talks on calculation of multiloop Feynman diagrams presented at ACAT'2002 (Moscow University).Comment: Section summary talk at ACAT'2002 (Moscow

Superfluid nuclear matter calculations

We present a method to calculate nuclear matter properties in the superfluid phase. The method is based on the use of self-consistent off-shell nucleon propagators in the T-matrix equation. Such a complete treatment of the spectral function, is required below and around $T_c$ due to a pseudogap formation in the spectral function. In the superfluid phase we introduce the anomalous self-energy in the fermion propagators and in the T-matrix equation, consistently with the strong coupling BCS equations. The equations for the nucleon spectral function include both a contribution of condensed and scattering pairs. The method is illustrated by numerical calculations. Above $T_c$ pseudogap formation is visible in the spectral function and below $T_c$ a superfluid gap also appears.Comment: correted version, appendix on numerical methods adde