Continuous Spectrum on Cosmological Collider

Abstract

We study the effects of a massive field with a continuous spectrum (continuum isocurvaton) on the inflationary bispectrum in the squeezed limit. As a concrete example, we extend the quasi-single field inflation model to include a continuum isocurvaton with a well-motivated spectral density from extra dimensions and focus on a contribution to the bispectrum with a single continuum isocurvaton exchange. In contrast to the usual case without the continuous spectrum, the amplitude of the bispectrum has a damping feature in the deep squeezed limit, which can be strong evidence for the continuous spectrum.

23 pages, 3 figures; v2: references added, to be published in Journal of Cosmology and Astroparticle Physics

References in corpus (21)

• Cosmological Collider Physics
• Non-Gaussianity as a Particle Detector
• Curvature Perturbation Spectrum in Two-field Inflation with a Turning Trajectory
• On the Inflationary Perturbations of Massive Higher-Spin Fields
• On duality of color and kinematics in (A)dS momentum space
• Bootstrapping Multi-Field Inflation: non-Gaussianities from light scalars revisited
• Parity violation in the scalar trispectrum: no-go theorems and yes-go examples
• Helical Inflation Correlators: Partial Mellin-Barnes and Bootstrap Equations
• Colliding Ghosts: Constraining Inflation with the Parity-Odd Galaxy Four-Point Function
• Bootstrapping One-Loop Inflation Correlators with the Spectral Decomposition
• Closed-Form Formulae for Inflation Correlators
• Parity-Odd and Even Trispectrum from Axion Inflation
• On the Effective Field Theory for Quasi-Single Field Inflation
• On the inflationary massive field with a curved field manifold
• Cosmological Shapes of Higher-Spin Gravity
• Gravitational Wave Probes of Massive Gauge Bosons at the Cosmological Collider
• On Continuum Effective Field Theories, Gravity and Holography
• Snowmass White Paper: The Cosmological Bootstrap
• Non-Gaussianity from $X,Y$ gauge bosons in Cosmological Collider Physics
• The Continuum Dark Matter Zoo
• On the consistency of (partially-)massless matter couplings in de Sitter space

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• Analytic Formulae for Inflationary Correlators with Dynamical Mass
• All plus four point (A)dS graviton function using generalized on-shell recursion relation
• Fingerprints of a Non-Inflationary Universe from Massive Fields
• Bispectrum Islands
• The cosmological collider in $R^2$ inflation
• Strongly Coupled Sectors in Inflation: Gapless Theories and Unparticles
• Dark Walker in the Early Universe: A Strongly Coupled Sector Model
• Strongly Coupled Sectors in Inflation: Gapped Theories of Unparticles