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Relativistic jets are highly collimated plasma outflows emerging fromaccreting black holes. They are launched with a significant amount of magneticenergy, which can be dissipated to accelerate nonthermal particles and giverise to electromagnetic radiation at larger scales. Kink instabilities can bean efficient mechanism to trigger dissipation of jet magnetic energy. Whileprevious works have studied the conditions required for the growth of kinkinstabilities in relativistic jets, the radiation signatures of theseinstabilities have not been investigated in detail. In this paper, we aim toself-consistently study radiation and polarization signatures from kinkinstabilities in relativistic jets. We combine large-scale relativisticmagnetohydrodynamic (RMHD) simulations with polarized radiation transfer of amagnetized jet, which emerges from the central engine and propagates throughthe surrounding medium. We observe that a localized region at the central spineof the jet exhibits the strongest kink instabilities, which we identify as thejet emission region. Very interestingly, we find quasi-periodic oscillation(QPO) signatures in the light curve from the emission region. Additionally, thepolarization degree appears to be anti-correlated to flares in the lightcurves. Our analyses show that these QPO signatures are intrinsically driven bykink instabilities, where the period of the QPOs is associated to the kinkgrowth time scale. The latter corresponds to weeks to months QPOs in blazars.The polarization signatures offer unique diagnostics for QPOs driven by kinkinstabilities.

Kink Instabilities In Relativistic Jets Can Drive Quasi-Periodic Radiation Signatures