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Abstract: We investigate models where structure formation is initiated by scalingseeds: We consider rapidly expanding relativistic shells of energy and showthat they can fit current CMB and large scale structure data if they expandwith super-luminal velocities. These acausally expanding shells provide aviable alternative to inflation for cosmological structure formation with thesame minimal number of parameters to characterize the initial fluctuations.Causally expanding shells alone cannot fit present data. Hybrid models wherecausal shells and inflation are mixed also provide good fits.



Autor: Sandro Scodeller, Martin Kunz, Ruth Durrer

Fuente: https://arxiv.org/







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