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Minimal Plateau Inflation in light of ACT DR6 Observations
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abstract
We explore a class of minimal plateau inflationary models constrained by the latest cosmological observations from ACT DR6, Planck 2018, BICEP/Keck 2018, and DESI, collectively referred to as P-ACT-LB-BK18. These models, characterized by a non-polynomial potential, are analyzed using both inflationary and post-inflationary reheating dynamics, and the limits on the viable model parameter space are obtained. Our results show that the minimal model with matter-like post inflationary reheating phase remains consistent with current data at both $1\sigma$ and $2\sigma$ levels. The inflaton potential's exponent $n$ and reheating epoch are intertwined in that upon its increase, corresponding to the stiffer reheating equation of state, the viable model parameter space in accordance with ACT shrinks, which is further facilitated by the primordial gravitational waves (PGWs) overproduction. We further explored a supergravity-inspired extension of the model under study with similar results, but with tighter constraints on the model parameters. These results emphasize the importance of jointly analyzing CMB data and reheating physics to test inflationary models.
Forward citations
Cited by 9 Pith papers
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Binomial α-attractor T-models yield non-universal ns near c≈−1/2 and a transient radiation-like reheating phase only under large quartic/quadratic hierarchies, undermining fine-tuned large-p monomial assumptions.
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A smooth hybrid inflation model, augmented with a stabilized modulus, reproduces the spectral index measured by ACT and SPT while keeping Higgs v.e.v.s at the GUT scale.
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Induced-Gravity Palatini-Like Higgs Inflation in Supergravity Confronts ACT DR6
A Palatini-supergravity Higgs-inflation model with induced gravity predicts a scalar spectral index ns≈0.972-0.974, consistent with ACT DR6, and favors split supersymmetry with gravitino mass 40-60 PeV.
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The BAO-CMB Tension and Implications for Inflation
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Pure natural inflation remains viable against latest ACT+DESI constraints, with a non-trivial fraction of parameter space allowed under standard reheating scenarios.
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Mukhanov's equation-of-state model of inflation still fits ACT-DR6-era data, with alpha set by the scalar tilt and beta set by the tensor-to-scalar ratio.
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