Beyond Einstein: Rewriting QED in a Higher-Derivative Gravity
![The theoretical framework details scattering interactions involving charged scalar particles-specifically, the [latex]\phi\phi \to \phi\phi[/latex] process-and considers contributions from a quartic scalar interaction, photon exchange, and the subtle influence of graviton exchange at the tree level.](https://arxiv.org/html/2603.05476v1/2603.05476v1/x8.png)
New calculations reveal how scattering amplitudes are modified when quantum electrodynamics is coupled to a specific higher-derivative gravity theory, offering insights into infrared and collinear behavior.




![The nonlinear generation of higher harmonics-frequencies designated [latex] \omega_i [/latex]-exhibits distinct decay properties, as demonstrated with initial data encompassing three harmonics at [latex] (\Omega_1, \Omega_2, \Omega_3) = (1, 2, 3) [/latex], revealing the complex dynamics inherent in frequency decomposition.](https://arxiv.org/html/2603.04501v1/2603.04501v1/fig_2.png)



