Running of the scalar spectral index in bouncing cosmologies

We calculate the running of the scalar index in the ekpyrotic and matter bounce cosmological scenarios, and find that it is typically negative for ekpyrotic models, while it is typically positive for realizations of the matter bounce where multiple fields are present. This can be compared to inflati...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2015-10, Vol.2015 (10), p.38-38
Main Authors: Lehners, Jean-Luc, Wilson-Ewing, Edward
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COMPARATIVE EVALUATIONS
COSMOLOGICAL INFLATION
COSMOLOGY
INDEXES
INFLATIONARY UNIVERSE
SCALARS
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Summary:We calculate the running of the scalar index in the ekpyrotic and matter bounce cosmological scenarios, and find that it is typically negative for ekpyrotic models, while it is typically positive for realizations of the matter bounce where multiple fields are present. This can be compared to inflation, where the observationally preferred models typically predict a negative running. The magnitude of the running is expected to be between 10{sup −4} and up to 10{sup −2}, leading in some cases to interesting expectations for near-future observations.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2015/10/038