ACT stands for Awkward Cosmology Theories

arXiv:2607.09808 · hep-ph, astro-ph.CO, gr-qc, hep-th · Submitted 2026-07-09 · Read on arXiv

Loris Del Grosso, Alfredo Urbano, Marcello Ziccolella

hep-ph, astro-ph.CO, gr-qc, hep-th

Submitted: 2026-07-09

Comments: 38 pages, 9 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Reheating — 47× in this paper · explained in 2 episodes
• ACT Data — 29× in this paper · explained in 1 episode
• Fine-Tuning — 19× in this paper · explained in 5 episodes
• Metric-Affine Gravity — 16× in this paper · explained in 2 episodes
• Atacama Cosmology Telescope — 7× in this paper
• Consistency — 6× in this paper · explained in 3 episodes
• Generalization — 5× in this paper · explained in 13 episodes
• Benchmark — 4× in this paper · explained in 2 episodes
• Abundance — 3× in this paper · explained in 1 episode
• Alignment — 1× in this paper · explained in 1 episode
• Anisotropy — 1× in this paper · explained in 3 episodes
• Model-Agnostic — 1× in this paper · explained in 2 episodes
• Trace — 1× in this paper · explained in 2 episodes

Sources

• Planck 2018 results. X. Constraints on inflation
• The Atacama Cosmology Telescope: DR6 Power Spectra, Likelihoods and $\Lambda$CDM Parameters
• The Atacama Cosmology Telescope: DR6 Constraints on Extended Cosmological Models
• Fractional attractors in light of the latest ACT observations
• How Accidental was Inflation?
• Independent connection in ACTion during inflation
• Minimal Extensions of the alpha-Starobinsky Model: Reconciling ACT DR6 and Reheating Constraints
• Curvature corrections to Starobinsky inflation can explain the ACT results
• Inflation in $F(R)$ gravity models revisited after ACT
• Refined Predictions for Starobinsky Inflation and Post-inflationary Constraints in Light of ACT
• Reconciling Nonminimally Coupled Higgs Inflation with ACT DR6 Observations through Reheating
• Reheating ACTs on Starobinsky and Higgs inflation
• How long before the end of inflation were observable perturbations produced?
• f(R) Theories Of Gravity
• Starobinsky Inflation from String Theory?
• On the Starobinsky Model of Inflation from Supergravity
• Higher Order Corrections in Minimal Supergravity Models of Inflation
• Curing singularities in cosmological evolution of F(R) gravity
• Beyond the Starobinsky model after ACT
• The implications of inflation for the last ACT

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