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Journal Article

Piecewise Silence in Discrete Cosmological Models


Gregoris,  Daniele
AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Clifton, T., Gregoris, D., & Rosquist, K. (2014). Piecewise Silence in Discrete Cosmological Models. Classical and quantum gravity, 31: 105012. doi:10.1088/0264-9381/31/10/105012.

Cite as: https://hdl.handle.net/11858/00-001M-0000-001A-0E4F-A
We consider a family of cosmological models in which all mass is confined to a regular lattice of identical black holes. By exploiting the reflection symmetry about planes that bisect these lattices into identical halves, we are able to consider the evolution of a number of geometrically distinguished surfaces that exist within each of them. We find that the evolution equations for the reflection symmetric surfaces can be written as a simple set of Friedmann-like equations, with source terms that behave like a set of interacting effective fluids. We then show that gravitational waves are effectively trapped within small chambers for all time, and are not free to propagate throughout the space-time. Each chamber therefore evolves as if it were in isolation from the rest of the universe. We call this phenomenon "piecewise silence".