I.F.T.
Almuerzo-Seminario
(Lunch seminar)
February 10th 1999, 14:00 p.m.
The Kreimer Hopf Algebra of Perturbative Field
Theory and Noncommutative Geometry
José Mariano Gracia-Bondía
U. Zaragoza
The Hopf algebra of ``rooted trees" discovered by Dirk
Kreimer codifies combinatorial and cohomological aspects of
renormalization in quantum field theory, as well as the analytical
behaviour of the Green functions under change of scales. An
introduction to Kreimer's algebra is given, emphasizing its (still
somewhat mysterious) essential coincidence with the algebra introduced
by Alain Connes and Henri Moscovici to simplify the ``local" formula
for the noncommutative index theorem, in the context of diffeomorphism
equivariant geometries.
The almuerzo-seminario is
intended to be an informal seminar and an open forum for discussion.
You are wellcome to bring your own
bocata (sandwich), or coffee or tea.
Where: Modulo C-XVI, 3rd floor,
Facultad de Ciencias U.A.M., C.U. Cantoblanco, 28049-Madrid
To get more information about this seminar e-mail
Tomás Ortín
or phone +34-91-397-8546
Last modified: Tue Feb 2 10:17:54 WET 1999