Perturbative unitarity in quasi-single field inflation

Abstract

We study implications of perturbative unitarity for quasi-single field inflation with the inflaton and one massive scalar. Analyzing high energy scattering, we show that non-Gaussianities with $|f_{\mathrm{NL}}|\gtrsim 1$ cannot be realized without turning on interactions which violate unitarity at a high energy scale. Then, we provide a relation between $f_{\mathrm{NL}}$ and the scale of new physics that is required for UV completion. In particular we find that for the Hubble scale $H\gtrsim 6\times 10^9$ GeV, Planck suppressed operators can easily generate too large non-Gaussanities and so it is hard to realize successful quasi-single field inflation without introducing a mechanism to suppress quantum gravity corrections. Also we generalize the analysis to the regime where the isocurvature mode is heavy and the inflationary dynamics is captured by the inflaton effective theory. Requiring perturbative unitarity of the two-scalar UV models with the inflaton and one heavy scalar, we clarify the parameter space of the $P(X,\varphi )$ model which is UV completable by a single heavy scalar.

arXiv comment31 pages, 10 figures

References in corpus (80)

• Non-Gaussian features of primordial fluctuations in single field inflationary models
• Dimension-Six Terms in the Standard Model Lagrangian
• The Effective Field Theory of Inflation
• Observational Signatures and Non-Gaussianities of General Single Field Inflation
• The Swampland: Introduction and Review
• What would we learn by detecting a gravitational wave signal in the cosmic microwave background anisotropy?
• Quasi-Single Field Inflation and Non-Gaussianities
• The Standard Model as an Effective Field Theory
• Signatures of Supersymmetry from the Early Universe
• On Soft Limits of Inflationary Correlation Functions
• Large non-Gaussianities with Intermediate Shapes from Quasi-Single Field Inflation
• Effective field theory approach to quasi-single field inflation and effects of heavy fields
• Non-Gaussianity as a Particle Detector
• Equilateral Non-Gaussianity and New Physics on the Horizon
• A Higgs-Higgs bound state due to New Physics at a TeV
• Unitarizing Higgs Inflation
• The Gelaton Scenario: Equilateral non-Gaussianity from multi-field dynamics
• Bootstrapping Inflationary Correlators in Mellin Space
• Quasi-Single Field Inflation with Large Mass
• The Cosmological Bootstrap: Weight-Shifting Operators and Scalar Seeds
• A Mellin Space Approach to Cosmological Correlators
• Planck constraints on the tensor-to-scalar ratio
• Signs of Analyticity in Single-Field Inflation
• Imprint of inflation on galaxy shape correlations
• Productive Interactions: heavy particles and non-Gaussianity
• Prospects for Cosmological Collider Physics
• Standard Model Background of the Cosmological Collider
• Curvature Perturbation Spectrum in Two-field Inflation with a Turning Trajectory
• Heavy-Lifting of Gauge Theories By Cosmic Inflation
• Standard Model Mass Spectrum in Inflationary Universe
• Equilateral non-Gaussianity from heavy fields
• A Unitarity-Conserving Higgs Inflation Model
• In Search of Large Signals at the Cosmological Collider
• Imprints of Massive Primordial Fields on Large-Scale Structure
• Probing P and CP Violations on the Cosmological Collider
• Quasi Single Field Inflation in the non-perturbative regime
• Effects and Detectability of Quasi-Single Field Inflation in the Large-Scale Structure and Cosmic Microwave Background
• Self-healing of unitarity in Higgs inflation
• Searches for other vacua II: A new Higgstory at the cosmological collider
• Light Particles with Spin in Inflation
• Non-Singular Bouncing Cosmology: Consistency of the Effective Description
• A Cosmological Higgs Collider
• Remarks on Higgs Inflation
• Seeing Higher-Dimensional Grand Unification In Primordial Non-Gaussianities
• Higher Spin Supersymmetry at the Cosmological Collider: Sculpting SUSY Rilles in the CMB
• Shapes of gravity: Tensor non-Gaussianity and massive spin-2 fields
• Minimal signatures of the Standard Model in non-Gaussianities
• Non-Gaussian Enhancements of Galactic Halo Correlations in Quasi-Single Field Inflation
• The Higgs Trilinear Coupling and the Scale of New Physics
• B-modes and the Nature of Inflation
• The Supersymmetric Effective Field Theory of Inflation
• Strongly Coupled Quasi-Single Field Inflation
• Prospects for constraining the shape of non-Gaussianity with the scale-dependent bias
• Cosmological Signatures of Superheavy Dark Matter
• Landscape tomography through primordial non-Gaussianity
• Cosmological Collider Signatures of Massive Vectors from Non-Gaussian Gravitational Waves
• Unitary null energy condition violation in $P(X)$ cosmologies
• Galaxy imaging surveys as spin-sensitive detector for cosmological colliders
• The Hunt for Primordial Interactions in the Large Scale Structures of the Universe
• Light inflaton completing Higgs inflation
• Disentangling mass spectra of multiple fields in cosmological collider
• Higgs Inflation as Nonlinear Sigma Model and Scalaron as its $\sigma$-meson
• Imprints of Oscillatory Bispectra on Galaxy Clustering
• Spectroscopy of Masses and Couplings during Inflation
• On the inflationary massive field with a curved field manifold
• On the Effective Field Theory for Quasi-Single Field Inflation
• Heavy Spinning Particles from Signs of Primordial Non-Gaussianities: Beyond the Positivity Bounds
• Higgs as heavy-lifted physics during inflation
• Probing the inflationary particle content: extra spin-2 field
• Heavy Particle Signatures in Cosmological Correlation Functions with Tensor Modes
• Unitarity and predictiveness in new Higgs inflation
• Symmetry and geometry in generalized Higgs effective field theory -- Finiteness of oblique corrections v.s. perturbative unitarity
• Cosmic variance in inflation with two light scalars
• Hybrid Quasi-Single Field Inflation
• New Shapes of Primordial Non-Gaussianity from Quasi-Single Field Inflation with Multiple Isocurvatons
• Inflation with Massive Vector Fields
• Boost Breaking in the EFT of Inflation
• A simple, exact, model of quasi-single field inflation
• Matching and running sensitivity in non-renormalizable inflationary models
• Non-Gaussianities in a two-field generalization of Natural Inflation

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• Obviating PBH overproduction for SIGWs generated by Pulsar Timing Arrays in loop corrected EFT of bounce
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• Perturbative unitarity and NEC violation in genesis cosmology
• Analytic Formulae for Inflationary Correlators with Dynamical Mass
• Regularized-Renormalized-Resummed loop corrected power spectrum of non-singular bounce with Primordial Black Hole formation
• Perturbative unitarity bounds from momentum-space entanglement
• Negative non-Gaussianity as a salvager for PBHs with PTAs in bounce
• On the consistency of (partially-)massless matter couplings in de Sitter space
• Perturbative unitarity bounds on field-space curvature in de Sitter spacetime: purity vs scattering amplitude
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