Speaker
Description
Cosmological particle production is commonly described with intermediate-time quasiparticle labels that cease to align with asymptotic constructions once evolution carries mode frequencies far outside adiabaticity. We analyze a coupled Proca–scalar model on spatially flat FLRW, retaining the longitudinal sector of the massive vector and quadratic mixing of scalar perturbations through foliation-selected operators that are spatially isotropic but generically boost violating. Physically meaningful creation is summarized by the symplectic Bogoliubov map relating adiabatically defined annihilation operators on early and late slices; at quadratic order the coupling requires multifield diagonalization of fluctuations together with the constrained canonical doubling this entails, placing the construction outside minimal massive-vector setups with effectively decoupled polarizations. The intertwined normal-mode spectrum and constraint sector fix the mixing between asymptotic positive-frequency representations throughout the transient regime. From the completed in/out map we extract the occupation-number and relic-density bookkeeping used in spin-one gravitational particle-production dark matter analyses and present normalized contrasts with minimal decoupled-polarization benchmarks.
| Other topic / keywords: | CGPP; massive spin-1 / Proca–scalar; Lorentz-breaking mixing; Bogoliubov / in-out formalism |
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