Using the Milky Way satellites to study interactions between cold dark matter and radiation

leave a comment »

C. Bœhm et al
The cold dark matter (CDM) model faces persistent challenges on small scales. In particular, taken at face value, the model significantly overestimates the number of satellite galaxies around the Milky Way. Attempts to solve this problem remain open to debate and have even led some to abandon CDM altogether.
However, current simulations are limited by the assumption that dark matter feels only gravity.
Here, we show that including interactions between CDM and radiation (photons or neutrinos) leads to a dramatic reduction in the number of satellite galaxies, alleviating the Milky Way satellite problem and indicating that physics beyond gravity may be essential to make accurate predictions of structure formation on small scales.
The methodology introduced here gives constraints on dark matter interactions that are significantly improved over those from the cosmic microwave background…
…Read more at (or

Read also: Interactive dark matter could explain Milky Way’s missing satellite galaxies

Written by physicsgg

September 9, 2014 at 6:42 am


Tagged with ,

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.

%d bloggers like this: