Radial oscillations of quark stars from perturbative QCD

We perform the general relativistic stability analysis against adiabatic radial oscillations of unpaired quark stars obtained using the equation of state for cold quark matter from perturbative QCD, the only free parameter being the renormalization scale. This approach consistently incorporates the effects of interactions and includes a built-in estimate of the inherent systematic uncertainties in the evaluation of the equation of state. We also take into account the constraints imposed by the recent gravitational wave event GW170817 to the compact star masses and radii, and restrict their vibrational spectrum.