The Atacama Cosmology Telescope: limits on dark matter-baryon interactions from DR4 power spectra

Zack Li, Rui An, Vera Gluscevic, Kimberly K. Boddy, J.  Richard Bond, Erminia Calabrese, Jo Dunkley, Patricio A Gallardo, Yilun Guan, Adam Hincks, Kevin M Huffenberger, Arthur Kosowsky, Thibaut Louis, Mathew S. Madhavacheril, Kavilan Moodley, Lyman A Page, Bruce Partridge, Frank J Qu, Maria Salatino, Blake SherwinCristóbal Sifón, Cristian Vargas, Edward J. Wollack

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Diverse astrophysical observations suggest the existence of cold dark matter that interacts only gravitationally with radiation and ordinary baryonic matter. Any nonzero coupling between dark matter and baryons would provide a significant step towards understanding the particle nature of dark matter. Measurements of the cosmic microwave background (CMB) provide constraints on such a coupling that complement laboratory searches. In this work we place upper limits on a variety of models for dark matter elastic scattering with protons and electrons by combining large-scale CMB data from the Planck satellite with small-scale information from Atacama Cosmology Telescope (ACT) DR4 data. In the case of velocity-independent scattering, we obtain bounds on the interaction cross section for protons that are 40% tighter than previous constraints from the CMB anisotropy. For some models with velocity-dependent scattering we find best-fitting cross sections with a 2σ deviation from zero, but these scattering models are not statistically preferred over ΛCDM in terms of model selection.

Original languageEnglish (US)
Article number046
JournalJournal of Cosmology and Astroparticle Physics
Issue number2
StatePublished - Feb 1 2023

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics


  • CMBR experiments
  • cosmological perturbation theory
  • dark matter theory


Dive into the research topics of 'The Atacama Cosmology Telescope: limits on dark matter-baryon interactions from DR4 power spectra'. Together they form a unique fingerprint.

Cite this