FOSSIL: A future mission for CMB spectral distortion measurements

@misc{aghanim2026fossil,
  title = {{FOSSIL: A future mission for CMB spectral distortion measurements}},
  author = {N Aghanim and B Maffei and J Aumont and A Beelen and B Borgo and E Bozzo and J Chluba and X Coulon and S Couturier and F Cuttaia and B Cyr and P de Bernardis and C de Jabrun and J.-J Díaz-García and D Eckert and G Fabbian and L Ferrari and F Finelli and T Gascard and J.E Gudmundsson and A Kogut and G Lagache and M. Loquet Le Gall and S Martin and A.I. Silva Martins and A Monfardini and C O'Sullivan and L Pagano and D Paoletti and G Pisano and M Remazeilles and V Reveret and J.A Rubino-Martin and V. Sauvage and G Savini and L Spencer and A Tartari and L Terenzi and N Trappe and D Watts and B Winter and E Baker and E.S Battistelli and R Battye and J.L Bernal and Anaïs Besnard and F.R Bouchet and M Braglia and C Burigana and M Calvo and S Caminade and M Citran and D Clements and W Coulton and E Courau and G de Zotti and E Di Valentino and Herve Dole and G Domenech and S Evangelista},
  howpublished = {HAL},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.17618},
  eprint = {2609.17618},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05763253v1},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - FOSSIL: A future mission for CMB spectral distortion measurements
AU  - N Aghanim
AU  - B Maffei
AU  - J Aumont
AU  - A Beelen
AU  - B Borgo
AU  - E Bozzo
AU  - J Chluba
AU  - X Coulon
AU  - S Couturier
AU  - F Cuttaia
AU  - B Cyr
AU  - P de Bernardis
AU  - C de Jabrun
AU  - J.-J Díaz-García
AU  - D Eckert
AU  - G Fabbian
AU  - L Ferrari
AU  - F Finelli
AU  - T Gascard
AU  - J.E Gudmundsson
AU  - A Kogut
AU  - G Lagache
AU  - M. Loquet Le Gall
AU  - S Martin
AU  - A.I. Silva Martins
AU  - A Monfardini
AU  - C O'Sullivan
AU  - L Pagano
AU  - D Paoletti
AU  - G Pisano
AU  - M Remazeilles
AU  - V Reveret
AU  - J.A Rubino-Martin
AU  - V. Sauvage
AU  - G Savini
AU  - L Spencer
AU  - A Tartari
AU  - L Terenzi
AU  - N Trappe
AU  - D Watts
AU  - B Winter
AU  - E Baker
AU  - E.S Battistelli
AU  - R Battye
AU  - J.L Bernal
AU  - Anaïs Besnard
AU  - F.R Bouchet
AU  - M Braglia
AU  - C Burigana
AU  - M Calvo
AU  - S Caminade
AU  - M Citran
AU  - D Clements
AU  - W Coulton
AU  - E Courau
AU  - G de Zotti
AU  - E Di Valentino
AU  - Herve Dole
AU  - G Domenech
AU  - S Evangelista
PY  - 2026
DA  - 2026/09/14
PB  - HAL
DO  - 10.48550/arxiv.2609.17618
UR  - https://hal.science/hal-05763253v1
AB  - We present FOSSIL, a proposed space mission which is designed to deliver unprecedented absolute spectroscopic measurements of the sky intensity over a broad frequency range (50GHz to 2THz) to accurately measure chemical-potential mu-type, Compton y-type, and Compton relativistic y-type CMB spectral distortions. FOSSIL will reach monopole sensitivities representing a gain of roughly three orders of magnitude over COBE/FIRAS. These capabilities will allow us to constrain primordial density fluctuations on scales k~(10 to 10^4)Mpc^-1, test inflationary models, probe dark matter annihilation/decay/interactions, constrain primordial black hole seed scenarios, and pin down feedback models in galaxy evolution and structure formation by measuring the cosmic thermal energy content. Furthermore, its 130 spectral channels will enable legacy astrophysics, including precise characterisation of the Cosmic Infrared Background, line intensity mapping during cosmic noon, and detailed Galactic dust mapping.
ER  -