Helical Inflation Correlators: Partial Mellin-Barnes and Bootstrap Equations

Understand

Massive spinning particles acquire helicity-dependent chemical potentials during the inflation from axion-type couplings.

• Such spinning fields can mediate sizable inflaton correlators which we call the helical inflation correlators.
• Helical inflaton correlators are approximately scale invariant, dS boost breaking, parity-violating, and are promising observables of cosmological collider physics.
• In this work, we present complete and analytical results for 4-point helical inflation correlators with tree-level exchanges of massive spinning particles, including both the smooth background and the oscillatory signals.