Non-Newtonian Gravity Effects of Color-Flavor-Locked Strange Stars and the Second Component of the GW190814 Event

The effects of non-Newtonian gravity on the properties of color-flavor-locked strange quark stars are studied using the standard MIT bag model. It is shown that the maximum mass of color-flavor-locked strange quark stars increases not only with the increasing of the value of color-superconducting energy gap, but also with the increasing of the non-Newtonian gravity parameter. Moreover, color-superconducting energy gap and non-Newtonian gravity parameter are constrained by the mass of the second component of the GW190814 event ($M=$ 2.6 $M_{\odot }$). It turns out that $M_{\max }>$ 2.6 $M_{\odot }$ ($M_{\max }$ is the maximum mass of the stars) can be satisfied only if $\Delta >$ 94.5 MeV ($\Delta$ is the color-superconducting energy gap) without the consideration of non-Newtonian gravity effects. However, if non-Newtonian gravity effects are included, smaller values of $\Delta$ could satisfy $M_{\max }>$ 2.6 $M_{\odot }$. Since small color-superconducting energy gap is favored by the surface temperature observation of the central compact object in Hess J1731-347 supernova remnant, the inclusion of non-Newtonian gravity effects is helpful in the explanation of the observed large mass of the second component of the GW190814 event.