Speaker
Description
In light-front holography, the transverse dynamics in the pion is described by the equation for scalar string modes in $AdS_5$ with a quadratic dilaton (soft-wall), resulting in a massless pion. To generate the physical pion mass and describe the low energy pion data, longitudinal dynamics must be considered. In a recent paper, Phys.Rev.D 111 (2025) 3, 034024 we identified a viable scenario in which low-energy pion data favour the weak-coupling limit of the quantum spectral curve of a four-segmented string in $AdS_3$. We now show that this viable scenario maps uniquely onto the same soft-wall $AdS_5$ spacetime that underlies transverse dynamics in light-front holography. The essential difference is that the longitudinal mapping is restricted to the near-boundary region of $AdS_5$, whereas the transverse mapping extends into the bulk geometry. This is a promising step in formulating a 3-dimensional holographic picture of the pion.
| Keyword-1 | Light-front holography |
|---|---|
| Keyword-2 | Pion physics |