Effective Planck Mass and the Scale of Inflation
  A recent paper argued that it is not possible to infer the energy scale of
inflation from the amplitude of tensor fluctuations in the Cosmic Microwave
Background, because the usual connection is substantially altered if there are
a large number of universally coupled fields present during inflation, with
mass less than the inflationary Hubble scale. We give a simple argument
demonstrating that this is incorrect.
