Dec 11 – 15, 2023
Tsung-Dao Lee Institute
Asia/Shanghai timezone

The smallest dark structures

Dec 14, 2023, 4:10 PM
Hall # 1

Hall # 1

Invited/Solicited talk in mini-symposium Dark Matter


M. Sten Delos (Carnegie Observatories)


Dark matter halos host galaxies, but cold dark matter is expected to cluster on much smaller scales as well. Small-scale dark matter structures would host no visible matter but can still leave hints about the nature of dark matter. If the dark matter is a thermal relic, the smallest structures are rho ~ r^-1.5 density cusps that arose at the onset of structure formation in the universe. For WIMP models, these cusps may be Earth-mass, and their great abundance and high internal density lead them to dominate the annihilation rate at the present time. Gravitational signatures of small-scale dark structures are more difficult to access, but gravitational detection is possible for minihalos arising in scenarios with amplified small-scale density perturbations.

Primary author

M. Sten Delos (Carnegie Observatories)

Presentation materials