Phantom braneworld and the Hubble tension

Understand

Braneworld models with induced gravity exhibit phantom-like behaviour of the effective equation of state of dark energy.

• They can, therefore, naturally accommodate higher values of $H_0$, preferred by recent local measurements, while satisfying the CMB constraints.
• We test the background evolution in such phantom braneworld scenarios with the current observational datasets.
• We find that the phantom braneworld prefers a higher value of $H_0$ even without the R19 prior, thereby providing a much better fit to the local measurements.