from einstein to horndeski: holographic transport coeffcients in modified gravity

This paper examines the holographic computation of bulk and shear viscosity ratios in strongly coupled thermal plasmas using the ads/bcft correspondence within horndeski gravity. we demonstrate that this framework leads to non-zero viscosity-to-entropy ratios ($zeta/s$ and $eta/s$) at low temperatures, indicating a break in conformal symmetry. at high temperatures, these ratios approach zero, recovering the expected conformal behavior of quark-gluon plasma. our findings provide new insights into the hydrodynamic properties of strongly coupled plasmas and offer a more nuanced understanding of qcd-like theories in holographic models.