  We calculate the tunneling density of states of a two-dimensional interacting
electron gas in a quantizing magnetic field. We show that the observed
pseudogap in the density of states can be understood as the result of an
infrared catastrophe in a noninteracting electron model. This catastrophe stems
from the response of an electronic system to the potential produced by the
abruptly added charge during a tunneling event. Our formalism can be applied at
any filling factor without the use of Chern-Simons or composite fermion theory.
