May 29, 2018 to June 3, 2018
Hyatt Regency Indian Wells Conference Center
US/Pacific timezone

Searching for Dark Matter at the Cosmic Dawn​

May 30, 2018, 4:10 PM
South Foyer | Ocotillo Room (Hyatt Regency Indian Wells Conference Center)

South Foyer | Ocotillo Room

Hyatt Regency Indian Wells Conference Center

44600 Indian Wells Lane, Indian Wells, CA 92210, USA


Dr Julian Munoz (Harvard University)


The nature of the dark matter is still a mystery, although current and upcoming 21-cm measurements during the cosmic dawn​ can provide ​a new arena on the search for​ the cosmological dark matter. ​This era saw the formation of the first stars, which coupled the spin temperature of hydrogen to its kinetic temperature---​producing 21-cm absorption in the CMB. The strength of this absorption acts as a thermostat, showing us if the baryons have been cooled down or heated up by different processes. In particular, during ​the cosmic dawn, the baryon-dark matter fluid is the​ slowest​ it will ever be​, making it ideal to search for dark matter elastically scattering with baryons through massless mediators, such as the photon. ​I will describe how dark-matter particles with an electric “minicharge” can significantly alter the baryonic temperature, and thus explain the anomalous 21-cm depth observed by the EDGES collaboration.
E-mail [email protected]

Primary author

Dr Julian Munoz (Harvard University)


Prof. Abraham Loeb (Harvard) Prof. Cora Dvorkin (Harvard)

Presentation materials