Universal Extra Dimensions and the Graviton Portal to Dark Matter

Understand

The Universal Extra Dimension (UED) paradigm is particularly attractive as it not only includes a natural candidate for the Dark Matter particle but also addresses several issues related to particle physics.

• Non-observations at the Large Hadron Collider, though, has brought the paradigm into severe tension.
• However, a particular 5-dimensional UED model emerges from a six-dimensional space-time with nested warping.
• The $AdS_6$ bulk protects both the Higgs mass as well as the UED scale without invoking unnatural parameter values.