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A Cosmological Higgs Collider
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The quantum fluctuations of the Higgs field during inflation could be a source of primordial density perturbations through Higgs-dependent inflaton decay. By measuring primordial non-Gaussianities, this so-called Higgs-modulated reheating scenario provides us a unique chance to probe Higgs interactions at extremely high energy scale, which we call the Cosmological Higgs Collider (CHC). We realize CHC in a simple scenario where the inflaton decays into Higgs-portal scalars, taking account of the decay of the Higgs fluctuation amplitude after inflation. We also calculate the CHC signals of Standard Model particles, namely their imprints in the squeezed bispectrum, which can be naturally large. The concept of CHC can be straightforwardly generalized to cosmological isocurvature colliders with other types of isocurvature perturbations.
Forward citations
Cited by 11 Pith papers
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Anatomy of Family Trees in Cosmological Correlators
A complete map of singularities and local series expansions for the hypergeometric building blocks of tree-level cosmological correlators.
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The Exact and Approximate Tales of Boost-Breaking Cosmological Correlators
The tree-level boost-breaking cosmological collider seed correlator is computed exactly for general sound speed and chemical potential, and saddle-point methods turn it into practical elementary-function templates.
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Searching for Inflationary Physics with the CMB Trispectrum: 1. Primordial Theory & Optimal Estimators
A set of quasi-optimal CMB trispectrum estimators is derived for local, EFT, direction-dependent, spinning-particle, point-source, and lensing templates, enabling first collider searches.
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Massive Inflationary Amplitudes: Differential Equations and Complete Solutions for General Trees
Every tree-level massive inflation correlator in the signal region can be written as one massive family tree series plus its cuts, with 2I summation variables.
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Cosmological Collider Signatures from Right-Handed Neutrino Loop
Right-handed neutrino loops in inflation with seesaw mechanism generate enhanced cosmological collider signatures via a chemical potential from a dimension-5 operator, softening Boltzmann suppression and amplifying os...
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Axion Inflation with a Massive Abelian Gauge Field
A massive Abelian gauge field axially coupled to the inflaton yields tachyonic production only for |ξ|>m/H, with sourced CMB curvature power suppressed as ~1/m̄²–1/m̄³ at fixed backreaction, allowing strong friction f...
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AGILE: an end-to-end Rubin-LSST simulation of AGNs, galaxies, and stars I. Software description and first data release
AGILE builds a 24 deg² truth catalog and a 1 deg² three-year LSST pilot (DR1) to measure flux recovery and Type-1 AGN completeness/purity from color and variability selections.
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Searching for Inflationary Physics with the CMB Trispectrum: 3. Constraints from Planck
A comprehensive Planck PR4 trispectrum analysis finds no primordial non-Gaussianity across 33 templates and sets leading constraints, including tau_NL loc < 1500 at 95% CL.
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Cosmological Correlators at the Loop Level
Using the partial Mellin-Barnes method, the author derives analytic signals from one-loop bubble diagrams in inflation correlators, including the first analytic results for a de Sitter boost-breaking bubble.
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Probing P and CP Violations on the Cosmological Collider
A rolling axion-like coupling to a massive gauge boson generates a CP-odd imaginary trispectrum of primordial fluctuations, while local four-scalar EFT operators in exact de Sitter space produce no observable signal.
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Cosmological Collider Physics and the Curvaton
In the curvaton scenario, heavy particles with masses near the inflationary Hubble scale generate observable non-Gaussian signals because the curvaton sector can have a much lower EFT cutoff than the inflaton sector.
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