Abstract

We calculate the fermion propagator in Friedmann–Lemaˆıtre–Robertson– Walker (FLRW) spacetimeswith constant deceleration q = −1, = −H˙ /H2 for excited states. For fermions whose mass is generated by a scalar field through a Yukawa coupling m = gYφ, we assume φ ∝α H. We first solve the mode functions by
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