Decoherence of Cosmological Perturbations from Boundary Terms and the
Non-Classicality of Gravity
- URL: http://arxiv.org/abs/2207.04435v3
- Date: Fri, 21 Apr 2023 14:03:11 GMT
- Title: Decoherence of Cosmological Perturbations from Boundary Terms and the
Non-Classicality of Gravity
- Authors: Chon Man Sou, Duc Huy Tran, Yi Wang
- Abstract summary: We show that the decoherence of inflationary curvature perturbation $zeta$ is dominated by a boundary term of the gravity action.
By comparing with a Schr"odinger-Newton toy model of classical gravity, we show that gravity theories of classical or quantum origins can be distinguished.
- Score: 3.9694334747397484
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We note that the decoherence of inflationary curvature perturbation $\zeta$
is dominated by a boundary term of the gravity action. Although this boundary
term cannot affect cosmological correlators $\left\langle \zeta^n
\right\rangle$, it induces much faster decoherence for $\zeta$ than that of
previous calculations. The gravitational origin of inflationary decoherence
sheds light on the quantum (or non-classical) nature of gravity. By comparing
with a Schr\"odinger-Newton toy model of classical gravity, we show that
gravity theories of classical or quantum origins can be distinguished by
comparing their different impacts on decoherence rate of $\zeta$. Our
calculation also indicates that density fluctuation $\delta\rho$ better
preserves quantum information than $\zeta$ for the purpose of constructing
cosmological Bell-like experiments.
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