Bimetric gravity is cosmologically viable

Akrami, Yashar (author): Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Nordiska institutet för teoretisk fysik (Nordita),Ruprecht-Karls-Universität Heidelberg, Germany

Hassan, S. Fawad (author): Stockholms 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

Könnig, Frank (author): Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Nordiska institutet för teoretisk fysik (Nordita),Ruprecht-Karls-Universität Heidelberg, Germany

Schmidt-May, Angnis (author): Stockholms 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

Solomon, Adam R. (author): Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Nordiska institutet för teoretisk fysik (Nordita),Ruprecht-Karls-Universität Heidelberg, Germany; University of Cambridge, UK

(creator_code:org_t)

Elsevier BV, 2015
2015
English.
In: Physics Letters B. - : Elsevier BV. - 0370-2693 .- 1873-2445. ; 748, s. 37-44

Related links:: https://doi.org/10.1...; show more...; https://doi.org/10.1...; https://urn.kb.se/re...; https://doi.org/10.1...; https://urn.kb.se/re...; show less...

Abstract Subject headings

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.

By the author/editor: Akrami, Yashar; Hassan, S. Fawad; Könnig, Frank; Schmidt-May, Ang ...; Solomon, Adam R.

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.