Using an EFT approach to fluctuations about a cosmological background in a Galileon theory, it is shown that a higher derivative term like R⁽³⁾ dg⁰⁰, where R⁽³⁾ is the three-dimensional curvature of a space-like hypersurface, can remedy the singularities predicted by recent no-go theorems.

From an EFT perspective, higher derivative terms naturally arise from the UV details of the theory which we have integrated out. This demonstrates the importance of their inclusion when singularities are present - these higher derivative corrections can resolve classical singularities. The resulting EFT is valid throughout the early universe, and can therefore by used (at least numerically) to calculate properties such as the CMB produced by slow-roll inflation.