Grand unification at the cosmological collider with chemical potential
Arushi Bodas (Enrico Fermi Institute, University of Chicago, S Ellis Ave, Chicago, IL, USA, Particle Theory Department, Fermilab, Kirk and Pine St, Batavia, IL, USA)
; Edward Broadberry (Maryland Center for Fundamental Physics, Department of Physics, University of Maryland, Stadium Dr, College Park, MD, USA); Raman Sundrum (Maryland Center for Fundamental Physics, Department of Physics, University of Maryland, Stadium Dr, College Park, MD, USA)
We introduce a tree-level chemical potential mechanism for spin-1 particles within cosmological collider physics, allowing them to be detected in primordial non-Gaussianities for masses above the inflationary Hubble scale. We apply this mechanism to orbifold grand unification and the massive unification partners of the standard model gauge bosons. Our mechanism requires at least a pair of massive vector fields which are singlets of the standard model, a condition which is satisfied in the classic “trinification” scenario. Assuming that the gauge hierarchy problem is solved by supersymmetry, gauge coupling running points to unification partners at ~ 10 GeV. We show that, within high-scale inflation, chemical potential enhancement can lead to observably strong signals for trinification partners in future cosmological surveys.
