Seminar series
Date
Mon, 09 Mar 2009
Time
12:00 -
13:00
Location
L3
Speaker
Paul Howe
Organisation
King's College London
Recent developments in computational techniques have shown that UV divergences can be tested at higher loop orders than is possible using standard Feynman diagrams. The results of these calculations are summarised. It is argued that they do not, as yet, contradict expectations from symmetry arguments. The latter lead to the expectation that D=4, N=8 supergravity is likely to diverge at five loops unless hitherto unknown mechanisms are at work. In the technical part of the talk the role of algebraic renormalisation and cohomological methods is highlighted.