On the Decoherence of Primordial Gravitons

• URL: http://arxiv.org/abs/2305.08071v3
• Date: Mon, 3 Jul 2023 09:51:55 GMT
• Title: On the Decoherence of Primordial Gravitons
• Authors: Sirui Ning, Chon Man Sou, Yi Wang
• Abstract summary: primordial scalar curvature and tensor perturbations, $zeta$ and $gamma_ij$, are conserved on super-horizon scales in minimal inflation models. Their wave functional has a rapidly oscillating phase which is slow-roll unsuppressed. Our results put a stronger lower bound of decoherence effect to the recent proposals probing squeezed primordial gravitons.
• Score: 3.9694334747397484
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: It is well-known that the primordial scalar curvature and tensor perturbations, $\zeta$ and $\gamma_{ij}$, are conserved on super-horizon scales in minimal inflation models. However, their wave functional has a rapidly oscillating phase which is slow-roll unsuppressed, as can be seen either from boundary (total-derivative) terms of cosmological perturbations, or the WKB approximation of the Wheeler-DeWitt equation. Such an oscillatory phase involves gravitational non-linearity between scalar and tensor perturbations. By tracing out unobserved modes, the oscillatory phase causes faster decoherence of primordial gravitons compared to those by bulk interactions. Our results put a stronger lower bound of decoherence effect to the recent proposals probing squeezed primordial gravitons.

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