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Strong lensing constraints on bimetric massive gravity
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
2013 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 10, 031- p.Article in journal (Refereed) Published
Abstract [en]

We derive dynamical and gravitational lensing properties of local sources in the Hassan-Rosen bimetric gravity theory. Observations of elliptical galaxies rule out values of the effective length-scale of the theory, in units of the Hubble radius, in the interval 10(-6). lambda(g) = rH less than or similar to 10(-3), unless the proportionality constant between the metrics at the background level is far from unity, in which case general relativity is effectively restored for local sources. In order to have background solutions resembling the concordance cosmological model, without fine-tuning of the parameters of the model, we are restricted to the upper interval, or lambda(g) /gamma H similar to 1, for which the Vainshtein mechanism is expected to restore general relativity for local sources. Except for a limited range of parameter values, the Hassan-Rosen theory is thus consistent with the observed lensing and dynamical properties of elliptical galaxies.

Place, publisher, year, edition, pages
2013. no 10, 031- p.
Keyword [en]
Classical Theories of Gravity, Black Holes
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-95746DOI: 10.1007/JHEP10(2013)031ISI: 000325222700002OAI: oai:DiVA.org:su-95746DiVA: diva2:662285
Note

AuthorCount:2;

Available from: 2013-11-06 Created: 2013-11-04 Last updated: 2017-12-06Bibliographically 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, JonasMörtsell, Edvard
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