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Title: Running of the scalar spectral index in bouncing cosmologies

Abstract

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.

Authors:
;  [1]
  1. Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Am Mühlenberg 1, 14476 Golm (Germany)
Publication Date:
OSTI Identifier:
22525242
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2015; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPARATIVE EVALUATIONS; COSMOLOGICAL INFLATION; COSMOLOGY; INDEXES; INFLATIONARY UNIVERSE; SCALARS

Citation Formats

Lehners, Jean-Luc, and Wilson-Ewing, Edward, E-mail: jean-luc.lehners@aei.mpg.de, E-mail: wilson-ewing@aei.mpg.de. Running of the scalar spectral index in bouncing cosmologies. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/10/038.
Lehners, Jean-Luc, & Wilson-Ewing, Edward, E-mail: jean-luc.lehners@aei.mpg.de, E-mail: wilson-ewing@aei.mpg.de. Running of the scalar spectral index in bouncing cosmologies. United States. doi:10.1088/1475-7516/2015/10/038.
Lehners, Jean-Luc, and Wilson-Ewing, Edward, E-mail: jean-luc.lehners@aei.mpg.de, E-mail: wilson-ewing@aei.mpg.de. Thu . "Running of the scalar spectral index in bouncing cosmologies". United States. doi:10.1088/1475-7516/2015/10/038.
@article{osti_22525242,
title = {Running of the scalar spectral index in bouncing cosmologies},
author = {Lehners, Jean-Luc and Wilson-Ewing, Edward, E-mail: jean-luc.lehners@aei.mpg.de, E-mail: wilson-ewing@aei.mpg.de},
abstractNote = {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.},
doi = {10.1088/1475-7516/2015/10/038},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 10,
volume = 2015,
place = {United States},
year = {2015},
month = {10}
}