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Title: Scalar instabilities in bimetric gravity: the Vainshtein mechanism and structure formation

Abstract

We investigate the observational consequences of scalar instabilities in bimetric theory, under the assumption that the Vainshtein mechanism restores general relativity within a certain distance from gravitational sources. We argue that early time instabilities have a negligible impact on observed structures. Assuming that the instabilities affect sub-horizon density fluctuations, we constrain the redshift, z{sub i}, below which instabilities are ruled out. For the ''minimal'' β{sub 1}-model, observational constraints are close to the theoretical expectations of z{sub i≈} 0.5, potentially allowing the model to be ruled in or out with a more detailed study, possibly including secondary cosmic microwave background constraints.

Authors:
;  [1]
  1. Oskar Klein Centre, Stockholm University, AlbaNova University Center, Stockholm, 106 91 Sweden (Sweden)
Publication Date:
OSTI Identifier:
22525235
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; DENSITY; DISTANCE; FLUCTUATIONS; GENERAL RELATIVITY THEORY; GRAVITATION; INSTABILITY; LIMITING VALUES; POTENTIALS; RED SHIFT; RELICT RADIATION; SCALARS

Citation Formats

Mörtsell, E., and Enander, J., E-mail: edvard@fysik.su.se, E-mail: enander@fysik.su.se. Scalar instabilities in bimetric gravity: the Vainshtein mechanism and structure formation. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/10/044.
Mörtsell, E., & Enander, J., E-mail: edvard@fysik.su.se, E-mail: enander@fysik.su.se. Scalar instabilities in bimetric gravity: the Vainshtein mechanism and structure formation. United States. doi:10.1088/1475-7516/2015/10/044.
Mörtsell, E., and Enander, J., E-mail: edvard@fysik.su.se, E-mail: enander@fysik.su.se. Thu . "Scalar instabilities in bimetric gravity: the Vainshtein mechanism and structure formation". United States. doi:10.1088/1475-7516/2015/10/044.
@article{osti_22525235,
title = {Scalar instabilities in bimetric gravity: the Vainshtein mechanism and structure formation},
author = {Mörtsell, E. and Enander, J., E-mail: edvard@fysik.su.se, E-mail: enander@fysik.su.se},
abstractNote = {We investigate the observational consequences of scalar instabilities in bimetric theory, under the assumption that the Vainshtein mechanism restores general relativity within a certain distance from gravitational sources. We argue that early time instabilities have a negligible impact on observed structures. Assuming that the instabilities affect sub-horizon density fluctuations, we constrain the redshift, z{sub i}, below which instabilities are ruled out. For the ''minimal'' β{sub 1}-model, observational constraints are close to the theoretical expectations of z{sub i≈} 0.5, potentially allowing the model to be ruled in or out with a more detailed study, possibly including secondary cosmic microwave background constraints.},
doi = {10.1088/1475-7516/2015/10/044},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 10,
volume = 2015,
place = {United States},
year = {2015},
month = {10}
}