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We show that short-range interactions are irrelevant around gaplessground-state delocalization-localization transitions driven by quasiperiodicityin interacting fermionic chains. In the presence of interactions, thesetransitions separate Luttinger Liquid and Anderson glass phases. Remarkably,close to criticality, we find that excitations become effectivelynon-interacting. By formulating a many-body generalization of a recentlydeveloped method to obtain single-particle localization phase diagrams, wecarry out precise calculations of critical points between Luttinger Liquid andAnderson glass phases and find that the correlation length critical exponenttakes the value $\nu = 1.001 \pm 0.007$, compatible with $\nu=1$ known exactlyat the non-interacting critical point. We also show that other criticalexponents, such as the dynamical exponent $z$ and a many-body analog of thefractal dimension are compatible with the exponents obtained at thenon-interacting critical point. Noteworthy, we find that the transitions areaccompanied by the emergence of a many-body generalization of previously foundsingle-particle hidden dualities. Finally, we show that in the limit ofvanishing interaction strength, all finite range interactions are irrelevant atthe non-interacting critical point.

Short-range interactions are irrelevant at the quasiperiodic-driven Luttinger Liquid to Anderson Glass transition