Relazione su invito
Balloon-borne missions for Cosmic Microwave Background research.
de Bernardis P. per le Collaborazioni OLIMPO e LSPE
Balloon-borne observations are particularly well suited to precision measurements of the Cosmic Microwave Background in a wide spectral range. In particular, measurements of CMB polarization, aimed at detecting the B-modes signal produced during inflation, need to cover high frequencies ($> 200$ GHz) to subtract the polarized foreground from interstellar dust; Sunyaev-Zeldovich Effect measurements, instead, need to cover both the decrement ($< 219 $ GHz) and the increment ($> 219$ GHz) spectral regions to separate the contributions from different components along the line of sight. In this review we describe the status of the LSPE (measuring CMB polarization at large angular scales) and OLIMPO (measuring the spectrum of CMB anisotropy and the SZ effect), focussing on the advantages of stratospheric missions, in view of future developments and of the forthcoming space missions in this field.