TY - THES AB - In this thesis, we present analytical expansion results of some single-mass-scale four-loop vacuum integrals in 3 and 4 dimensions. After finding hypergeometric representations with half-integer coefficients, we use algorithms which we implemented in FORM to expand these in terms of nested sums. DA - 2009 KW - Perturbative quantum field theory KW - Electrostatic QCD KW - Feynman integrals KW - Multi-loop integrals KW - Hypergeometric functions LA - eng PY - 2009 TI - Feynman integrals, hypergeometric functions and nested sums UR - https://nbn-resolving.org/urn:nbn:de:hbz:361-16047 Y2 - 2024-11-21T21:39:00 ER -