Simultaneous constraints on bias, normalization and growth index through
  power spectrum measurements
  In this Letter we point out that redshift surveys can break the degeneracy
between the galaxy bias, the power spectrum normalization, \sigma_{8,0} and the
growth factor, without the need for external information by using a simple and
rather general parametrization for the growth rate, the well known
\gamma-parametrization and measuring the power spectrum at least at two
different redshifts. We find that in next-generation surveys like Euclid,
\sigma_{8,0} and \gamma can be measured to within 1% and 5%, respectively,
while the bias b(z) can be measured to within 1-2% in each of 14 equal-width
redshift bins spanning 0.7<=z<=2.
