Abstract
We investigate the linear and semilinear massive Klein–Gordon equations in geometrical frameworks of type “Conformal Cyclic Cosmology” of R. Penrose, or “Singular Bouncing Scenario” as well. We give sufficient conditions on the decay of the mass to the fields be able to propagate across the Big-Bang.
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Notes
However when \({\hat{g}}\) is a solution of the Vacuum Einstein Equations \(R_{\mu \mu }-\frac{1}{2}Rg_{\mu \mu }+\Lambda g_{\mu \mu }=0\), we have \(R_{{\hat{g}}}=2\frac{n+1}{n-1}\Lambda \), and the case \((\xi =0,m^2=\frac{n+1}{2n}\Lambda )\) is equivalent to the conformal invariant massless case. In particular Friedrich in [13] studied a non-linear version of (1.9) as well as the coupling to the background, which in the present article is prescribed.
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Bachelot, A. Propagation of Massive Scalar Fields in Pre-Big Bang Cosmologies. Commun. Math. Phys. 380, 973–1001 (2020). https://doi.org/10.1007/s00220-020-03880-4
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DOI: https://doi.org/10.1007/s00220-020-03880-4