articlePhysical review. D/Physical review. D.Feb 3, 2026HYBRID OA

Constraints on attractor models of inflation and reheating from P l a n c k , BICEP/Keck, ACT DR6, and SPT-3G data

JEJohn EllisMAMarcos A. G. GarcíaKAKeith A. OliveSVSarunas Verner

King's College London · European Organization for Nuclear Research · +3 more institutions

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Abstract

We analyze the latest cosmic microwave background (CMB) constraints on the scalar spectral index n s and tensor-to-scalar ratio r from 2018, BICEP/Keck 2018, the Atacama Cosmology Telescope Data Release 6 (ACT DR6), and the South Pole Telescope (SPT-3G) data, focusing on their implications for attractor models of inflation. We compare systematically observational bounds with theoretical predictions for both E-model ( α -Starobinsky) and T-model potentials. The observational constraints accommodate E-models with α ≲ 25 , with the canonical Starobinsky model ( α = 1 ) predicting n s = 0.958 – 0.963 for reheating temperatures between 100 − 10 10 GeV , in good agreement with 2018 data and…

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Topics & keywords

Topics
Keywords
  • Inflation (cosmology)
  • Attractor
  • Stability (learning theory)
  • Constraint (computer-aided design)
UN Sustainable Development Goals
  • Decent work and economic growth
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