= Planck-suppressed corrections to inflaton potentials
{c}
{title2=$\Delta V=\sum_{p>4}c_p\phi^p/M_{\rm Pl}^{p-4}$}
In an <effective field theory>, higher-power terms in an <inflaton> <scalar potential> can be important when $\phi/M_{\rm Pl}$ is large, even if $V/M_{\rm Pl}^4$ is small. An assumed simple <monomial inflation potential> over such a field range needs a <symmetry> or <ultraviolet completion> controlling these operators and <radiative corrections>. A large field value alone does not establish Planckian <energy density> or invalidate every possible completion.
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