Relativistic field theories in a magnetic background as noncommutative field theories
Abstract:
I discuss the connection of the dynamics in relativistic field theories
in a strong magnetic field with the dynamics of noncommutative field theories
(NCFT). As examples, the Nambu-Jona-Lasinio model, quantum electrodynamics
and quantum chromodynamics in a magnetic field are considered. It is shown
that this connection is rather sophisticated. In fact, the corresponding
NCFT are different from the conventional ones considered in the literature.
In particular, the UV/IR mixing is absent in these theories. The reason
of that is an inner structure (i.e., dynamical form-factors) of neutral
composites which plays an important role in providing consistency of these
NCFT. The NCFT could find interesting applications in condensed matter
systems and string theories.