Screening away the $H_0$ tension

Understand

This Essay explores consequences of a dark non-linear electromagnetic sector in a Universe with a net dark charge for matter.

• The cosmological dynamics can be described by a Lema\^itre model and understood thanks to a screening mechanism driven by the electromagnetic non-linearities that suppress the dark force on small scales.
• Only at low redshift, when the screening scale enters the Hubble horizon, do cosmological structures commence to feel the dark repulsion.
• This repulsive force enhances the local value of the Hubble constant, thus providing a promising scenario for solving the Hubble tension.