  A recent paper by Martin and Schwarz [1] argues that the ``standard
inflationary result" has been finally proven. The result itself is formulated
as: ``the closer the inflationary epoch is to the de Sitter space-time, the
less important are large-scale gravitational waves in the CMBR today".
Beginning from the basic equations of Grishchuk [2, 3] the authors say [1] that
Grishchuk's conclusion about approximate equality of metric amplitudes for
gravitational waves and density perturbations ``is wrong because the time
evolution of the scalar metric perturbation through the (smooth) reheating
transition was not calculated correctly". They reiterate a claim about ``big
amplification" of scalar perturbations (in contrast to gravitational waves)
during reheating. The authors say [1] that after appropriate correction they
have recovered the "standard result" within Grishchuk's approach. It is shown
in this Comment that the "big amplification" is a misinterpretation. There is
no difference in the evolution of long-wavelength metric perturbations for
gravitational waves and density perturbations: they both stay approximately
constant. The influence of cosmological transitions on the evolution is none at
all, as long as the wavelength of the perturbation is much larger than the
Hubble radius. It is shown that from the approach of [2, 3] follow the
conclusions of [2, 3] without change. Finally, it is argued that the ``standard
inflationary result" does not follow from the correct evolution and quantum
normalization of density perturbations.
