Fire at the Tip of the Throat: Hagedorn Phase after brane-antibrane inflation?
The study investigates if brane-antibrane inflation can transition into an open-string Hagedorn phase after annihilation. It analyzes how energy released during this process affects dark radiation by enhancing visible sector entropy. The outcome depends on whether the Standard Model and inflation occur in the same or different warped throats, suggesting conditions for suppressing $\Delta N_{\text{eff}}$ below current limits.