Cosmological collider signals of modular spontaneous CP breaking

[摘要] We consider a modular-invariant extension of the Standard Model. Assuming that the modulus is the inflaton, the CP-violating phases of the Yukawa couplings evolve during inflation. This dynamics favours a Higgs condensate, so that Standard Model fermions mediate a one-loop cosmological collider signal enhanced by chemical potentials. The effect appears too small for next-generation experiments. We provide precise expressions for Dirac fermions with chemical potentials in de Sitter.

[发布日期] 2026-09-08

[关键词] Cosmology of Theories BSM;Cosmological models;Early Universe Particle Physics