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Cosmic expansion histories in massive bigravity with symmetric matter coupling
Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
2015 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 1, 006Article in journal (Refereed) Published
Abstract [en]

We study the cosmic expansion history of massive bigravity with a viable matter coupling which treats both metrics on equal footing. We derive the Friedmann equation for the effective metric through which matter couples to the two metrics, and study its solutions. For certain parameter choices, the background cosmology is identical to that of LCDM. More general parameters yield dynamical dark energy, which can still be in agreement with observations of the expansion history. We study specific parameter choices of interest, including minimal models, maximally-symmetric models, and a candidate partially-massless theory.

Place, publisher, year, edition, pages
2015. no 1, 006
Keyword [en]
modified gravity, dark energy theory
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-112949DOI: 10.1088/1475-7516/2015/01/006ISI: 000349283000006OAI: oai:DiVA.org:su-112949DiVA: diva2:782013
Available from: 2015-01-19 Created: 2015-01-19 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Cosmic tests of massive gravity
Open this publication in new window or tab >>Cosmic tests of massive gravity
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Massive gravity is an extension of general relativity where the graviton, which mediates gravitational interactions, has a non-vanishing mass. The first steps towards formulating a theory of massive gravity were made by Fierz and Pauli in 1939, but it took another 70 years until a consistent theory of massive gravity was written down. This thesis investigates the phenomenological implications of this theory, when applied to cosmology. In particular, we look at cosmic expansion histories, structure formation, integrated Sachs-Wolfe effect and weak lensing, and put constraints on the allowed parameter range of the theory. This is done by using data from supernovae, the cosmic microwave background, baryonic acoustic oscillations, galaxy and quasar maps and galactic lensing.

The theory is shown to yield both cosmic expansion histories, galactic lensing and an integrated Sachs-Wolfe effect consistent with observations. For the structure formation, however, we show that for certain parameters of the theory there exists a tension between consistency relations for the background and stability properties of the perturbations. We also show that a background expansion equivalent to that of general relativity does not necessarily mean that the perturbations have to evolve in the same way.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2015. 104 p.
Keyword
Modified gravity, massive gravity, cosmology, dark energy, dark matter
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-113076 (URN)978-91-7649-049-5 (ISBN)
Public defence
2015-02-20, sal FD5, AlbaNova Universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 5: Manuscript. Paper 6: Manuscript.

Available from: 2015-01-29 Created: 2015-01-22 Last updated: 2015-08-24Bibliographically approved

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Enander, JonasEdvard, Mörtsell
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