Physical parameter space of bimetric theory and SN1a constraints

Lüben, Marvin; Schmidt-May, Angnis; Weller, Jochen

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Physical parameter space of bimetric theory and SN1a constraints

Lüben, M., Schmidt-May, A., & Weller, J. (2020). Physical parameter space of bimetric theory and SN1a constraints. Journal of Cosmology and Astroparticle Physics, 09, 024. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2020-27.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0008-1AC1-1 Version Permalink: https://hdl.handle.net/21.11116/0000-0008-1AC2-0

Genre: Journal Article

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Creators:
Lüben, Marvin¹, Author
Schmidt-May, Angnis¹, Author
Weller, Jochen¹, Author

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1Max Planck Institute for Physics, Max Planck Society and Cooperation Partners, ou_2253650

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Free keywords: Cosmology

Abstract: Bimetric theory describes a massless and a massive spin-2 field with fully non-linear (self-)interactions. It has a rich phenomenology and has been successfully tested with several data sets. However, the observational constraints have not been combined in a consistent framework, yet. We propose a parametrization of bimetric solutions in terms of the effective cosmological constant $\Lambda$ and the mass $m_\mathrm{FP}$ of the spin-2 field as well as its coupling strength to ordinary matter $\bar\alpha$. This simplifies choosing priors in statistical analysis and allows to directly constrain these parameters with observational data not only from local systems but also from cosmology. By identifying the physical vacuum of bimetric theory these parameters are uniquely determined. We work out the dictionary for the new parametrization for various submodels and present the implied consistency constraints on the physical parameter space. We then apply the dictionary to derive observational constraints from SN1a on the physical parameters. As a result we find that even self-accelerating models with a heavy spin-2 field are in perfect agreement with current supernova data.

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Dates: Date issued: 2020

Publication Status: Issued

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Identifiers: Other: MPP-2020-27
URI: https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2020-27
arXiv: arxiv:2003.03382
URI: https://inspirehep.net/literature?q=find%20eprint%202003.03382

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Title: Journal of Cosmology and Astroparticle Physics

Abbreviation : JCAP

Source Genre: Journal

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Pages: - Volume / Issue: 09 Sequence Number: - Start / End Page: 024 Identifier: -