The Triple Tbar{T}-Like Flow in Quantum Field Theories: Irrelevant, Marginal, and Relevant

We introduce a one-parameter root-$T\bar T$-like flow, $ \partial_\lambda \mathcal{L}=\mathcal{R}_\lambda^{1/\alpha}$, which organizes stress-tensor deformations into irrelevant, marginal, and relevant branches. Within duality-invariant electrodynamics in four dimensions, and equivalently within two-dimensional integrable sigma models, the flow admits a closed-form solution controlled by an auxiliary equation. The marginal point $\alpha=1$ reproduces the root-$T\bar T$ / ModMax branch, while $\alpha<1$ gives irrelevant deformations distinct from the standard Born-Infeld $T\bar T$ flow. For $\alpha>1$, the same construction yields explicit relevant $T\bar T$-like Lagrangians. These results suggest that root-$T\bar T$ flows provide a common organizing principle for duality-invariant and integrable deformations.