Multiple Peaks in the Angular Power Spectrum of the Cosmic Microwave Background: Significance and Consequences for Cosmology
Year: 2002
Type: article
Abstract: Three peaks and two dips have been detected in the power spectrum of the cosmic microwave background by the BOOMERANG experiment, at l = (213 ), (541 ), (845 ) and l = (416 ), (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 seven-dimensional parameter space of such models, which gives good agreement with the model-independent estimates. We 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 seven-dimensional cosmological parameter space, using an independent computational pipeline, and find excellent agreement: Ω tot = 1.02 versus 1.04 ± 0.05, Ω b h 2 = 0.022 versus 0.019 , and n s = 0.96 versus 0.90 ± 0.08. The determination of the best fit by the maximization procedure effectively ignores nonzero optical depth of reionization τ C > 0, and the difference in primordial spectral index n s between the two methods is thus a consequence of the strong correlation of n s with the τ C .
Source: The Astrophysical Journal
DOI: 10.1086/324298
Authors: P. de Bernardis, P. A. R. Ade, J. J. Bock, J. R. Bond, J. Borrill, A. Boscaleri, K. Coble, C. R. Contaldi, B. P. Crill, G. De Troia, P. Farese, K. Ganga, M. Giacometti, E. Hivon, V. V. Hristov, A. Iacoangeli, A. H. Jaffe, W. C. Jones, A. E. Lange, L. Martinis, S. Masi, P. Mason, P. D. Mauskopf, A. Melchiorri, T. Montroy, C. B. Netterfield, E. Pascale, F. Piacentini, D. Pogosyan, G. Polenta, F. Pongetti, S. Prunet, G. Romeo, J. E. Ruhl, F. Scaramuzzi
Institutions: Sapienza University of Rome, Queen Mary University of London, Jet Propulsion Laboratory, University of Toronto, Canadian Institute for Theoretical Astrophysics, Lawrence Berkeley National Laboratory, National Energy Research Scientific Computing Center, National Research Council, University of California, Santa Barbara, California Institute of Technology, Infrared Processing and Analysis Center, Space Sciences Laboratory, University of California, Berkeley, National Agency for New Technologies, Energy and Sustainable Economic Development, ENEA Frascati Research Centre, Cardiff University, University of Oxford, Istituto Nazionale di Geofisica e Vulcanologia
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2037392005