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dc.contributor.author
Akramia, Yashar
dc.contributor.author
Hassan, S.F.
dc.contributor.author
Könnig, Frank
dc.contributor.author
Schmidt-May, Angnis
dc.contributor.author
Solomon, Adam R.
dc.date.accessioned
2019-03-27T14:30:39Z
dc.date.available
2017-06-11T21:16:54Z
dc.date.available
2019-03-27T14:30:39Z
dc.date.issued
2015-09-02
dc.identifier.issn
0370-2693
dc.identifier.issn
0031-9163
dc.identifier.issn
1873-2445
dc.identifier.other
10.1016/j.physletb.2015.06.062
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/107104
dc.identifier.doi
10.3929/ethz-b-000107104
dc.description.abstract
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, Mf, 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 ΛCDM, but with a technically-natural value for the cosmological constant. We find Mf 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.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Elsevier
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
Modified gravity
en_US
dc.subject
Massive gravity
en_US
dc.subject
Background cosmology
en_US
dc.subject
Cosmic acceleration
en_US
dc.subject
Dark energy
en_US
dc.subject
Bimetric gravity
en_US
dc.subject
Bigravity
en_US
dc.title
Bimetric gravity is cosmologically viable
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2015-06-29
ethz.journal.title
Physics Letters B
ethz.journal.volume
748
en_US
ethz.journal.abbreviated
Phys. Lett. B
ethz.pages.start
37
en_US
ethz.pages.end
44
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.grant
Extended Symmetries in Gauge and Gravity Theories
en_US
ethz.identifier.scopus
ethz.identifier.nebis
000001856
ethz.publication.place
Amsterdam
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02511 - Institut für Theoretische Physik / Institute for Theoretical Physics::03896 - Beisert, Niklas / Beisert, Niklas
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02511 - Institut für Theoretische Physik / Institute for Theoretical Physics::03896 - Beisert, Niklas / Beisert, Niklas
ethz.grant.agreementno
615203
ethz.grant.fundername
EC
ethz.grant.funderDoi
10.13039/501100000780
ethz.grant.program
FP7
ethz.date.deposited
2017-06-11T21:17:13Z
ethz.source
ECIT
ethz.identifier.importid
imp593653b51669d20764
ethz.ecitpid
pub:167533
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-12T15:32:16Z
ethz.rosetta.lastUpdated
2019-03-27T14:30:43Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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