Prof. Bruno Maffei from the University of Pari-Saclay came to our lab. and spent about two weeks discussing the LiteBIRD and next generation of the CMB experiments. On the last day of his stay (10th of July), a colloquium was held and he gave an overview of BISOU [1], the next generation CMB balloon experiment.
BISOU will measure the frequency spectrum of the CMB with high precision and investigate the spectral distortion from the blackbody emission. The spectrum of CMB has not been measured for 30 years since the FIRAS, instrument of COBE satellite led by NASA.
If the the spectral distortion can be measured, it is expected to reveal how energy behaved in the early universe and provide new insights into the thermal history of the universe.
Reference
[1] B. Maffei te al., “BISOU: a balloon project to measure the CMB spectral distortions”, arXiv:2111.00246
