Higgs-Modular Inflation

Abstract

We investigate the role of the Higgs field as a fundamental scalar in the Standard Model within the framework of modular inflation models, where a modulus field acts as the inflaton and its interactions are governed by an underlying modular symmetry. In general, the Higgs field can participate in the dynamics of modular inflation, leading to a two-field inflationary system-termed \emph{Higgs-Modular inflation}-which exhibits non-trivial dynamics and interesting phenomenological implications. We analyze Higgs-Modular inflation both analytically and numerically, highlighting its attractor behavior and the resulting observational constraints. In particular, we find that Higgs-Modular inflation is favored by the latest data release from the Atacama Cosmology Telescope (ACT) in certain regions of parameter space. This is in contrast to both pure Higgs inflation and pure modular inflation with a Starobinsky-type potential, which tend to predict a relatively low spectral index. Additionally, we discuss the cutoff scale of this inflationary model and the reheating processes induced by the decays of the modulus and the Higgs field.

v2: 20 pages, 3 figures, minor changes, published version

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Cited by in corpus (19)

• Keeping the relation between the Starobinsky model and no-scale supergravity ACTive
• Independent connection in ACTion during inflation
• Non-minimal coupling in light of ACT
• Improved Predictions on Higgs-Starobinsky Inflation and Reheating with ACT DR6 and Primordial Gravitational Waves
• Increase of $n_s$ in regularized pole inflation & Einstein-Cartan gravity
• Observational constraints on inflationary models with non-minimally derivative coupling by ACT
• $\alpha$-attractor inflation modified by GUP in light of ACT observations
• Inflation in $F(R)$ gravity models revisited after ACT
• Inflationary Models with Gauss-Bonnet Coupling in Light of ACT Observations
• Approximate reconstruction of inflationary potential with ACT observations
• Smooth hybrid inflation in light of ACT DR6 data
• Updating GUT-Scale Pole Higgs Inflation After ACT DR6
• Harrison-Zeldovich attractor: From Planck to ACT results
• Induced-Gravity Palatini-Like Higgs Inflation in Supergravity Confronts ACT DR6
• Single-field D-type inflation in the minimal supergravity in light of Planck-ACT-SPT data
• Beyond the Starobinsky model after ACT
• Confronting Inflation and Reheating with Observations: Improved Predictions
• Effect of Moduli Redefinitions on Fibre Inflation
• Mutated hilltop inflation in light of Planck/ACT observations