Three peaks and two dips have been detected in the power spectrum of the cosmic microwave background from the BOOMERANG experiment , at \ell \sim 210 , 540 , 840 and \ell \sim 420 , 750 , respectively .
Using model-independent analyses , we find that all five features are statistically significant and we measure their location and amplitude .
These are consistent with the adiabatic inflationary model .
We also calculate the mean and variance of the peak and dip locations and amplitudes in a large 7-dimensional parameter space of such models , which gives good agreement with the model-independent estimates , and forecast where the next few peaks and dips should be found if the basic paradigm is correct .
We test the robustness of our results by comparing Bayesian marginalization techniques on this space with likelihood maximization techniques applied to a second 7-dimensional cosmological parameter space , using an independent computational pipeline , and find excellent agreement : \Omega _ { tot } = 1.02 ^ { +0.06 } _ { -0.05 } vs . 1.04 \pm 0.05 , \Omega _ { b } h ^ { 2 } = 0.022 ^ { +0.004 } _ { -0.003 } vs . 0.019 ^ { +0.005 } _ { -0.004 } , and n _ { s } = 0.96 ^ { +0.10 } _ { -0.09 } vs . 0.90 \pm 0.08 .
The deviation in primordial spectral index n _ { s } is a consequence of the strong correlation with the optical depth .