Figure 16: The energy spectrum of the stochastic background of gravitational wave around the
critical frequency in radiation dominated epoch. The filled circles represent the spectrum
caused by the non-standard cosmological expansion of the universe. Taking account of the KK-mode
excitations, the spectrum becomes the one plotted by filled squares. In the asymptotic region depicted
in the solid line, the frequency dependence becomes almost the same as the one predicted in the
four-dimensional theory (long-dashed line). Figure taken from [199].
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