Conformally related early universe models can be told apart by the location of frame-invariant variables built from the time variation of particle and Planck masses.
Anisotropic 'hairs' in string cosmology
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abstract
In this letter we investigate whether the isotropy problem is naturally solved in inflationary cosmologies inspired by string theory, so called pre-big-bang cosmologies. We find that, in contrast to what happens in the more common 'potential inflation' models, initial anisotropies do not decay during pre-big-bang inflation.
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gr-qc 1years
2019 1verdicts
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Towards degeneracy breaking of early universe models
Conformally related early universe models can be told apart by the location of frame-invariant variables built from the time variation of particle and Planck masses.