Constraining primordial magnetic fields with line-intensity mapping

Tal Adi, Sarah Libanore, Hector Afonso G. Cruz, Ely D. Kovetz

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Primordial magnetic fields (PMFs) offer a compelling explanation for the origin of observed magnetic fields, especially on extragalactic scales. Such PMFs give rise to excess of power in small scale matter perturbations that could strongly influence structure formation. We study the impact of the magnetically enhanced matter power spectrum on the signal that will be observed by line-intensity mapping (LIM) surveys targeting carbon monoxide (CO) emission from star-forming galaxies at high redshifts. Specifically, the voxel intensity distribution of intensity maps provides access to small-scale information, which makes it highly sensitive to signatures of PMFs on matter overdensities. We present forecasts for future LIM CO surveys, finding that they can constrain PMF strength as small as B 1Mpc ∼ 0.006-1 nG, depending on the magnetic spectral index and the targeted redshifts.

Original languageEnglish
Article number035
JournalJournal of Cosmology and Astroparticle Physics
Issue number9
StatePublished - 1 Sep 2023


  • intergalactic media
  • primordial magnetic fields

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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