The COSmic Monopole Observer (COSMO)

Masi, S., Battistelli, E., de Bernardis, P., Columbro, F., Coppolecchia, A., D'Alessandro, G., De Petris, M., Lamagna, L., Marchitelli, E., Mele, L., Paiella, A., Piacentini, F., Pisano, G., Bersanelli, M., Franceschet, C., Manzan, E., Mennella, D., Realini, S., Cibella, S., Martini, F., Pettinari, G., Coppi, G., Gervasi, M., Limonta, A., Zannoni, M., Piccirillo, L. and Tucker, C. ORCID: https://orcid.org/0000-0002-1851-3918 2023. The COSmic Monopole Observer (COSMO). Presented at: The Sixteenth Marcel Grossmann Meeting, Virtual, 5-10 July 2021. Proceedings of the MG16 Meeting on General Relativity. World Scientific Publishing Company, pp. 1654-1671. 10.1142/9789811269776_0131

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Abstract

The COSmic Monopole Observer (COSMO) is an experiment to measure low-level spectral distortions in the isotropic component of the Cosmic Microwave Background (CMB). Deviations from a pure blackbody spectrum are expected at low level (< 1 ppm) due to several astrophysical and cosmological phenomena, and promise to provide important independent information on the early and late phases of the universe. They have not been detected yet, due to the extreme accuracy required, the best upper limits being still those from the COBE-FIRAS mission. COSMO is based on a cryogenic differential Fourier Transform Spectrometer, measuring the spectral brightness difference between the sky and an accurate cryogenic blackbody. The first implementation of COSMO, funded by the Italian PRIN and PNRA programs, will operate from the Concordia station at Dome-C, in Antarctica, and will take advantage of a fast sky-dip technique to get rid of atmospheric emission and its fluctuations, separating them from the monopole component of the sky brightness. Here we describe the instrument design, its capabilities, the current status. We also discuss its subsequent implementation in a balloon-flight, which has been studied within the COSMOS program of the Italian Space Agency.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	World Scientific Publishing Company
ISBN:	978-981-12-6977-6
Date of First Compliant Deposit:	16 March 2023
Last Modified:	16 Mar 2023 13:06
URI:	https://orca.cardiff.ac.uk/id/eprint/157760

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