Abstract
We study the production of massive gauge bosons during inflation from the axion-type coupling to the inflaton and the corresponding oscillatory features in the primordial non-Gaussianity. In a window in which both the gauge boson mass and the chemical potential are large, the signal is potentially reachable by near-future large scale structure probes. This scenario covers a new region in oscillation frequency which is not populated by previously known cosmological collider models. We also demonstrate how to properly include the exponential factor and discuss the subtleties in obtaining power dependence of the gauge boson mass in the signal estimate.
Highlights
Where Jμ5 is a chiral fermion current and F is the field strength of a gauge field
In a window in which both the gauge boson mass and the chemical potential are large, the signal is potentially reachable by near-future large scale structure probes
We demonstrate how to properly include the exponential factor and discuss the subtleties in obtaining power dependence of the gauge boson mass in the signal estimate
Summary
We layout the framework for our analysis. The starting point is an inflaton endowed with an approximate shift symmetry φ → φ + c. G is the field strength of a gauge field which would become strongly coupled at a scale around Λinf , and generates a potential for the inflaton φ. In this case, H ∼ Λ2inf /MPl ∼ 1013 GeV. For the scenario under consideration in the paper, it would be more interesting to consider the case in which the physics at the inflation scale Λinf is responsible for the generation of the gauge boson mass. These Goldstones can develop a potential which in the end Higgses the spectator gauge group Such a set up has been explored extensively for the electroweak symmetry breaking, known as the composite Higgs models (see [51] for a review). We can estimate ΛΣ ∼ m∗/g∗ ∼ Λinf /(4π)
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