Warmth Elevating the Depths: Shallower Voids with Warm Dark Matter

Understand

Warm dark matter (WDM) has been proposed as an alternative to cold dark matter (CDM), to resolve issues such as the apparent lack of satellites around the Milky Way.

• Even if WDM is not the answer to observational issues, it is essential to constrain the nature of the dark matter.
• The effect of WDM on haloes has been extensively studied, but the small-scale initial smoothing in WDM also affects the present-day cosmic web and voids.
• It suppresses the cosmic "sub-web" inside voids, and the formation of both void haloes and subvoids.