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Bimetric gravity is...
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Akrami, YasharStockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Nordiska institutet för teoretisk fysik (Nordita),Ruprecht-Karls-Universität Heidelberg, Germany
(author)
Bimetric gravity is cosmologically viable
- Article/chapterEnglish2015
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Elsevier BV,2015
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Numbers
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LIBRIS-ID:oai:DiVA.org:kth-173419
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173419URI
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https://doi.org/10.1016/j.physletb.2015.06.062DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-120887URI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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QC 20150914
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Bimetric theory describes gravitational interactions in the presence of an extra spin-2 field. Previous work has suggested that its cosmological solutions are generically plagued by instabilities. We show that by taking the Planck mass for the second metric, M-f, to be small, these instabilities can be pushed back to unobservably early times. In this limit, the theory approaches general relativity with an effective cosmological constant which is, remarkably, determined by the spin-2 interaction scale. This provides a late-time expansion history which is extremely close to Lambda CDM, but with a technically-natural value for the cosmological constant. We find M-f should be no larger than the electroweak scale in order for cosmological perturbations to be stable by big-bang nucleosynthesis. We further show that in this limit the helicity-0 mode is no longer strongly-coupled at low energy scales.
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Added entries (persons, corporate bodies, meetings, titles ...)
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Hassan, S. FawadStockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC),Nordita SU;Department of Physics and the Oskar Klein Centre, Stockholm University, AlbaNova University Center, SE 106 91 Stockholm, Sweden(Swepub:su)fawad
(author)
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Könnig, FrankStockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Nordiska institutet för teoretisk fysik (Nordita),Ruprecht-Karls-Universität Heidelberg, Germany(Swepub:kth)PI000000
(author)
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Schmidt-May, AngnisStockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),Eidgenössische Technische Hochschule Zürich, Germany,Nordita SU;Institut für Theoretische Physik, Eidgenössische Technische Hochschule Zürich, Wolfgang-Pauli-Strasse 27, 8093 Zürich, Switzerland(Swepub:su)aschm
(author)
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Solomon, Adam R.Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Nordiska institutet för teoretisk fysik (Nordita),Ruprecht-Karls-Universität Heidelberg, Germany; University of Cambridge, UK(Swepub:kth)u15yl3ae
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KTHNordic Institute for Theoretical Physics NORDITA
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Related titles
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In:Physics Letters B: Elsevier BV748, s. 37-440370-26931873-2445
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