$φ^4$ inflation is not excluded

Details $φ^4$ inflation is not excluded $φ^4$ inflation is not excluded

2009-03-20

arxiv.org/abs/0903.3543v3

Phys.Rev.D80:023525,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Extended motivation, matches published version in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.80.023525

We present counter examples to the claim that the $\lambda \phi^4$ inflaton potential is excluded by recent cosmological data. Finding counter examples requires that the actually observed primordial fluctuations are generated at the onset of the slow-roll regime of inflation. This set up for the initial conditions is therefore different from the usual scenario of chaotic inflation where inflation starts long before the observed fluctuations are created. The primordial power spectrum of "just enough" chaotic inflation violates scale-invariance in a way consistent with observations.

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