The BOOMERanG experiment and the curvature of the Universe

S. Masi, P. De Bernardis, G. De Troia, M. Giacometti, A. Iacoangeli, F. Piacentini, G. Polenta, P.A.R. Ade, P.D. Mauskopf, J.J. Bock, J.R. Bond, C.R. Contaldi, D. Pogosyan, S. Prunet, J. Borrill, A. Boscaleri, E. Pascale, K. Coble, P. Farese, T. MontroyJ.E. Ruhl, B.P. Crill, V.V. Hristov, W.C. Jones, A.E. Lange, P. Mason, G. De Gasperis, P. Natoli, K. Ganga, E. Hivon, N. Vittorio, A.H. Jaffe, L. Martinis, F. Scaramuzzi, A. Melchiorri, C.B. Netterfield, F. Pongetti, G. Romeo

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Abstract

We describe the BOOMERanG experiment and its main result, i.e. the measurement of the large scale curvature of the Universe. BOOMERanG is a balloon-borne microwave telescope with sensitive cryogenic detectors. BOOMERanG has measured the angular distribution of the Cosmic Microwave Background on ∼ 3% of the sky, with a resolution of ∼ 10 arcmin and a sensitivity of ∼ 20 μK per pixel. The resulting image is dominated by hot and cold spots with rms fluctuations ∼ 80 μK and typical size of ∼ 1°. The detailed angular power spectrum of the image features three peaks and two dips at ℓ = (213-13+10), (541-32+20), (845-25+12) and ℓ = (416-12+22), (750-750+20), respectively. Such very characteristic spectrum can be explained assuming that the detected structures are the result of acoustic oscillations in the primeval plasma. In this framework, the measured pattern constrains the density parameter Ω to be 0.85 < Ω < 1.1 (95% confidence interval). Other cosmological parameters, like the spectral index of initial density fluctuations, the density parameter for baryons, dark matter and dark energy, are detected or constrained by the BOOMERanG measurements and by other recent CMB anisotropy experiments. When combined with other cosmological observations, these results depict a new, consistent, cosmological scenario.
Original languageEnglish
Pages (from-to)243 - 261
Number of pages19
JournalProgress in Particle and Nuclear Physics
Volume48
Issue number1
DOIs
Publication statusPublished - 2002
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Masi, S., De Bernardis, P., De Troia, G., Giacometti, M., Iacoangeli, A., Piacentini, F., ... Romeo, G. (2002). The BOOMERanG experiment and the curvature of the Universe. Progress in Particle and Nuclear Physics, 48(1), 243 - 261. https://doi.org/10.1016/S0146-6410(02)00131-X