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2011

Enhanced CMBR non-Gaussianities from Lorentz violation

Chialva, Diego

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We study the effects of Lorentz symmetry violation on the scalar CMBR bispectrum.

Our quantitative results show that there can be enhancements in the bispectrum for specific configurations in momentum space, when the modified dispersion relations resulting from the symmetry breaking violate the adiabatic condition for a short period of time in the early Universe.
The kind of configurations that are enhanced and the pattern of oscillations in wavenumbers that generically appear in the bispectrum strictly depend on the form of the modified dispersion relation, and therefore on the pattern of Lorentz violation.
These effects are found to be distinct from those that appear when modelling very high-energy (transplanckian) physics via modified boundary conditions (modified vacuum).

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