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X. Chen, Y. Wang, and Z.-Z. Xianyu, “Loop Corrections to Standard Model Fields in Inflation,” JHEP
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2020

Gauge Boson Signals at the Cosmological Collider

Wang, Lian-Tao, Xianyu, Zhong-Zhi

Understand

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.