Pulsating variable stars in the VVV globular clusters

The globular clusters in the innermost regions of the Galaxy are significantly affected by severe extinction, making their physical parameters less reliably measured compared to those of their counterparts in the outer halo. However, near-infrared observations—such as those provided by the Vista Variables in the Via Lactea (VVV) survey and its extension, VVV-X—greatly diminish the effects of extinction. More than 50 known Galactic globular clusters located towards the inner Milky Way fall within the surveyed regions of the VVV and VVV-X. Their multi-epoch observations enable us to search for and characterize the pulsating stars within these clusters. The tight near-infrared period-luminosity-metallicity relations of these variable stars facilitate a more accurate parametrization of the globular clusters they belong to. In my contribution, I will present our ongoing analyses of the pulsating stars in some of these lesser-known objects as part of the VVV and VVV-X framework.