Non-minimally coupled inflation

Non-minimally coupled inflation is an inflationary model in which the constant which couples gravity to the inflaton field is not small. The coupling constant is usually represented by $\xi$ (Xi), which features in the action (constructed by modifying the Einstein–Hilbert action):^[1]

$S = \int d^4x \sqrt{-g} \left[{m_P^2 \over 2} R - {1 \over 2} \partial^{\mu}\phi \partial_{\mu}\phi - V(\phi) - {\xi \over 2} R \phi^2\right]$

$\xi$ represents the strength of the interaction between $R$ and $\phi$ , which relate to the curvature of space and the magnitude of the inflaton field respectively.

References

↑ Hertzberg (2010-02-16), p. 1–2

Bibliography

Hertzberg, Mark P (2010). "On Inflation with Non-minimal Coupling". arXiv:1002.2995.