PIRSA:20070022

Video URL

https://pirsa.org/20070022

Relieving the Hubble tension with primordial magnetic fields

Pogosian, L. (2020). Relieving the Hubble tension with primordial magnetic fields. Perimeter Institute for Theoretical Physics. https://pirsa.org/20070022

Pogosian, Levon. Relieving the Hubble tension with primordial magnetic fields. Perimeter Institute for Theoretical Physics, Jul. 14, 2020, https://pirsa.org/20070022 

          @misc{ scivideos_PIRSA:20070022,
            doi = {10.48660/20070022},
            url = {https://pirsa.org/20070022},
            author = {Pogosian, Levon},
            keywords = {Cosmology},
            language = {en},
            title = {Relieving the Hubble tension with primordial magnetic fields},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2020},
            month = {jul},
            note = {PIRSA:20070022 see, \url{https://scivideos.org/index.php/pirsa/20070022}}
          }

Levon Pogosian Simon Fraser University (SFU)

Talk numberPIRSA:20070022
DOI10.48660/20070022
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

The standard cosmological model determined from the accurate cosmic microwave background measurements made by the Planck satellite implies a value of the Hubble constant H0 that is 4.2 standard deviations lower than the one determined from Type Ia supernovae. The Planck best fit model also predicts lower values of the matter density fraction Om and clustering amplitude S8 compared to those obtained from the Dark Energy Survey Year 1 data. We show that accounting for the enhanced recombination rate due to additional inhomogeneities in the baryon density can solve both the H0 and the S8-Om tensions. The additional baryon inhomogeneities can be induced by primordial magnetic fields present in the plasma prior to recombination. The required field strength to solve the Hubble tension is just what is needed to explain the existence of galactic, cluster, and extragalactic magnetic fields without relying on dynamo amplification. Our results show clear evidence for this effect and motivate further detailed studies of primordial magnetic fields, setting several well-defined targets for future observations.