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2025

Curvaton in light of the ACT results

Byrnes, Christian T., Cortês, Marina, Liddle, Andrew R.

Understand

The latest results from the Atacama Cosmology Telescope Collaboration have moved the preferred perturbation spectral index $n_{\rm s}$ closer towards one.

We reanalyse constraints on the simplest version of the curvaton model, using $n_{\rm s}$ and the tensor-to-scalar ratio $r$.
We show that in the massless curvaton case the model gives the same locus of $n_{\rm s}$-$r$ predictions as the power-law model $V(\phi) \propto \phi^p$, but with a different and more elegant physical interpretation.
The model gives an excellent account of current observational data, both in the regime where the curvaton dominates the observed perturbations and with an admixture of inflaton-originated perturbations of up to about one-third of the total.

Built on

Y. Akrami et al. (Planck), Astron. Astrophys. 641
Original
1905
Earlier work this paper cites.
A. A. Starobinsky, Phys. Lett. B 91
1980
Earlier work this paper cites.
S. Mollerach, Phys. Rev. D 42
1990
Earlier work this paper cites.
A. R. Liddle and D. H. Lyth, Phys. Lett. B 291
1992
Earlier work this paper cites.
A. Kosowsky and M. S. Turner, Phys. Rev. D 52
1995
Earlier work this paper cites.
A. D. Linde and V. F. Mukhanov, Phys. Rev. D 56
1997
Earlier work this paper cites.
K. Enqvist and M. S. Sloth, Nucl. Phys. B 626
2002
Earlier work this paper cites.
D. H. Lyth and D. Wands, Phys. Lett. B 524
2002
Earlier work this paper cites.
T. Moroi and T. Takahashi, Phys. Lett. B 522
2002
Earlier work this paper cites.
N. Bartolo and A. R. Liddle, Phys. Rev. D 65
2002
Earlier work this paper cites.
D. Wands, N. Bartolo, S. Matarrese, and A. Riotto, Phys. Rev. D 66
2002
Earlier work this paper cites.
A. R. Liddle and S. M. Leach, Phys. Rev. D 68
2003
Earlier work this paper cites.
D. H. Lyth, C. Ungarelli, and D. Wands, Phys. Rev. D 67
2003
Earlier work this paper cites.
C. T. Byrnes and D. Wands, Phys. Rev. D 74
2006
Earlier work this paper cites.