Abstract
In the recent studies of four-dimensional Einstein–Hilbert action, quite a few interesting results such as the Kawai–Lewellen–Tye (KLT) relations, MHV-Lagrangian and quadratic forms have been reported. These results naturally raise an important question: Whether these results are valid for the modified theories of gravity in 4-dimensions? In this work, we consider R+αR2 gravity and derive the complete quartic interaction vertex in light-cone gauge. We then discuss the implications of the results for KLT relations, and computing MHV amplitudes.
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