Magnetic fields from inflation?
  We consider the possibility of generation of the seeds of primordial magnetic
field on inflation and show that the effect of the back reaction of this field
can be very important. Assuming that back reaction does not spoil inflation we
find a rather strong restriction on the amplitude of the primordial seeds which
could be generated on inflation. Namely, this amplitude recalculated to the
present epoch cannot exceed $10^{-32}G$ in $Mpc$ scales. This field seems to be
too small to be amplified to the observable values by galactic dynamo
mechanism.
