Chaotic initial conditions for nonminimally coupled inflation via a conformal factor with a zero

Abstract

Nonminimally coupled inflation models based on a nonminimal coupling $\xi {\varphi }^{2}R$ and a ${\varphi }^4$ potential are in excellent agreement with the scalar spectral index observed by Planck. Here we consider the modification of these models by a conformal factor with a zero. This enables a nonminimally coupled model to have a Planck-scale potential energy density at large values of the inflaton field, which can account for the smooth, potential-dominated volume that is necessary for inflation to start. We show that models with a conformal factor zero generally predict a correlated increase of the spectral index $n_s$ and tensor-to-scalar ratio $r$. For values of $n_s$ that are within the present $2-\sigma$ bounds from Planck, modification by $\Delta r$ as large as 0.0013 is possible, which is large enough to be measured by next generation cosmic microwave background polarization satellites.

v2: PRD published version

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Cited by in corpus (4)

• Beyond the Poles in Attractor Models of Inflation
• Non-minimally assisted chaotic inflation
• Pole inflation from non-minimal coupling to gravity
• Nonminimally Assisted Inflation: A General Analysis