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2016

Warm Little Inflaton

Bastero-Gil, Mar, Berera, Arjun, Ramos, Rudnei O. et al.

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We show that inflation can naturally occur at a finite temperature T>H that is sustained by dissipative effects, when the inflaton field corresponds to a pseudo Nambu-Goldstone boson of a broken gauge symmetry.

Similarly to "Little Higgs" scenarios for electroweak symmetry breaking, the flatness of the inflaton potential is protected against both quadratic divergences and the leading thermal corrections.
We show that, nevertheless, nonlocal dissipative effects are naturally present and are able to sustain a nearly thermal bath of light particles despite the accelerated expansion of the Universe.
As an example, we discuss the dynamics of chaotic warm inflation with a quartic potential and show that the associated observational predictions are in very good agreement with the latest Planck results.

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M. Bastero-Gil, A. Berera and R. O. Ramos, JCAP 1109
Original
1929
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Similar

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Then

A. Berera, I. G. Moss and R. O. Ramos, Rept. Prog. Phys. 72
Original
2009
Later among the works it cites.
M. Bastero-Gil and A. Berera, Int. J. Mod. Phys. A 24
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2009
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C. Graham and I. G. Moss, JCAP 0907
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2009
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M. Bastero-Gil, A. Berera and J. G. Rosa, Phys. Rev. D 84
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2011
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M. Bastero-Gil, A. Berera and R. O. Ramos, JCAP 1107
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2011
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This agrees with YL , although with a somewhat smaller numerical factor due to improved approximations. This has, however, no significant impact on our conclusions

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