Snowmass2021 - Letter of interest cosmology intertwined II: The hubble constant tension


Eleonora Di Valentino, The University of Manchester
Luis A. Anchordoqui, City University of New York
Özgür Akarsu, İstanbul Teknik Üniversitesi
Yacine Ali-Haimoud, New York University
Luca Amendola, Universität Heidelberg
Nikki Arendse, Niels Bohr Institute
Marika Asgari, The University of Edinburgh
Mario Ballardini, Alma Mater Studiorum Università di Bologna
Spyros Basilakos, National Observatory of Athens
Elia Battistelli, Sapienza Università di Roma
Micol Benetti, Università degli Studi di Napoli Federico II
Simon Birrer, Stanford University
François R. Bouchet, Sorbonne Universite
Marco Bruni, Institute of Cosmology and Gravitation
Erminia Calabrese, Cardiff University
David Camarena, Federal University of Espirito Santo
Salvatore Capozziello, Università degli Studi di Napoli Federico II
Angela Chen, University of Michigan, Ann Arbor
Jens Chluba, The University of Manchester
Anton Chudaykin, Institute for Nuclear Research
Eoin Colgáin, Asia Pacific Center for Theoretical Physics (APCTP)
Francis Yan Cyr-Racine, The University of New Mexico
Paolo de Bernardis, Sapienza Università di Roma
Javier de Cruz Pérez, Universitat de Barcelona
Jacques Delabrouille, IN2P3 Institut National de Physique Nucleaire et de Physique des Particules
Jo Dunkley, Princeton University
Celia Escamilla-Rivera, Universidad Nacional Autónoma de México
Agnès Ferté, Jet Propulsion Laboratory
Fabio Finelli, Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
Wendy Freedman, The University of Chicago
Noemi Frusciante, Instituto de Astrofísica e Ciências do Espaço
Elena Giusarma, Michigan Technological UniversityFollow

Document Type


Publication Date



Department of Physics


The current cosmological probes have provided a fantastic confirmation of the standard Λ Cold Dark Matter cosmological model, which has been constrained with unprecedented accuracy. However, with the increase of the experimental sensitivity, a few statistically significant tensions between different independent cosmological datasets emerged. While these tensions can be in part the result of systematic errors, the persistence after several years of accurate analysis strongly hints at cracks in the standard cosmological scenario and the need for new physics. In this Letter of Interest we will focus on the 4.4σ tension between the Planck estimate of the Hubble constant H0 and the SH0ES collaboration measurements. After showing the H0 evaluations made from different teams using different methods and geometric calibrations, we will list a few interesting models of new physics that could solve this tension and discuss how the next decade's experiments will be crucial.

Publication Title

Astroparticle Physics