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2020

The Scalar Chemical Potential in Cosmological Collider Physics

Bodas, Arushi, Kumar, Soubhik, Sundrum, Raman

Understand

Non-analyticity in co-moving momenta within the non-Gaussian bispectrum is a distinctive sign of on-shell particle production during inflation, presenting a unique opportunity for the "direct detection" of particles with masses as large as the inflationary Hubble scale ($H$).

However, the strength of such non-analyticity ordinarily drops exponentially by a Boltzmann-like factor as masses exceed $H$.
In this paper, we study an exception provided by a dimension-5 derivative coupling of the inflaton to heavy-particle currents, applying it specifically to the case of two real scalars.
The operator has a "chemical potential" form, which harnesses the large kinetic energy scale of the inflaton, $\dot{\phi}_{0}^{1/2} \approx 60H$, to act as an efficient source of scalar particle production.