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Scalar Field (Inflaton)

A hypothetical quantum field that drove the inflationary expansion, possessing a potential energy that decayed exponentially.
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The statement of the theorem

Let ϕ\phi be the scalar field (inflaton) and V(ϕ)V(\phi) be its potential energy density. The dynamics of ϕ\phi in a Friedmann-Lemaître-Robertson-Walker (FLRW) background are governed by the Klein-Gordon equation in curved spacetime:\n1−g∂μ(−ggμν∂νϕ)=−V′(ϕ)\frac{1}{\sqrt{-g}} \partial_\mu (\sqrt{-g} g^{\mu\nu} \partial_\nu \phi) = -V'(\phi)