# **Nuclear Physics Colloquium **

Location:
FIAS Science Campus Riedberg, Ruth-Moufang-Str. 1, Lecture
Hall FIAS 100

Time: Friday, July 05, 2013, 3:30-4:30pm (plus
10min for discussion)

Contact: hees@fias.uni-frankfurt.de

# On Energy Momentum
& Spin: the inertial currents in classical field theory

## Friedrich W. Hehl
(Univ. of Cologne and Univ.of Missouri-Columbia)

In
special relativity, quantum matter can be classified according to
mass-energy and spin. The corresponding field-theoretical notions
are the energy-momentum-stress tensor T and the spin angular
momentum tensor S. Since each object in physics carries energy
and, if fermionic, also spin, the notions of T and S can be
spotted in all domains of physics, starting from the mechanical
stress in engineering mechanics, over the Maxwell stress in
electrodynamics to the energy-momentum tensor of matter in special
and in general relativity. We discuss, in particular, asymmetric
stress tensors, spin fluids, the Belinfante-Rosenfeld
symmetrization of T, the improved energy-momentum of Callan,
Coleman, and Jackiw. We discuss in how far Weyl's dictum that only
general relativity leads to a proper definition of the energy
concept is appropriate. This seminar is open ended and tries to
build bridges to relativistic themodynamics.

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Physics Colloquium Homepage