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We investigate cosmological particle production in spacetimes where Lorentzinvariance emerges in the infrared limit, but is explicitly broken in theultraviolet regime. Our specific model focuses on the boost subgroup thatsupports CPT invariance and results in a momentum-dependent dispersionrelation. Motivated by previous studies on spacetimes emerging from amicroscopic substrate, we show how these modifications naturally lead tomomentum-dependent rainbow metrics. Firstly, we investigate the possibility ofreproducing cosmological particle production in spacetimes emerging from realBose gases. We have studied the influence of non-perturbative ultravioletcorrections in time-dependent analogue spacetimes, leading tomomentum-dependent emergent rainbow spacetimes. Within certain limits theanalogy is sufficiently good to simulate relativistic quantum field theory intime-dependent classical backgrounds, and the quantum effects are approximatelyrobust against the model-dependent modifications. Secondly, we analyze howsignificantly the particle production process deviates from the common picture.While very low-energy modes do not see the difference at all, some modes"re-enter the Hubble horizon" during the inflationary epoch, and extremeultraviolet modes are completely insensitive to the expansion.

Cosmological particle production in emergent rainbow spacetimes