Off-diagonal ekpyrotic scenarios and equivalence of modified, massive and/or Einstein gravity

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Vacaru, Sergiu I.: Off-diagonal ekpyrotic scenarios and equivalence of modified, massive and/or Einstein gravity. In: Physics Letters B 752 (2016), S. 27-33. DOI: http://dx.doi.org/10.1016/j.physletb.2015.11.024

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Abstract: 
Using our anholonomic frame deformation method, we show how generic off-diagonal cosmological solutions depending, in general, on all spacetime coordinates and undergoing a phase of ultra-slow contraction can be constructed in massive gravity. In this paper, there are found and studied new classes of locally anisotropic and (in)homogeneous cosmological metrics with open and closed spatial geometries. The late time acceleration is present due to effective cosmological terms induced by nonlinear off-diagonal interactions and graviton mass. The off-diagonal cosmological metrics and related Stückelberg fields are constructed in explicit form up to nonholonomic frame transforms of the Friedmann–Lamaître–Robertson–Walker (FLRW) coordinates. We show that the solutions include matter, graviton mass and other effective sources modeling nonlinear gravitational and matter fields interactions in modified and/or massive gravity, with polarization of physical constants and deformations of metrics, which may explain certain dark energy and dark matter effects. There are stated and analyzed the conditions when such configurations mimic interesting solutions in general relativity and modifications and recast the general Painlevé–Gullstrand and FLRW metrics. Finally, we elaborate on a reconstruction procedure for a subclass of off-diagonal cosmological solutions which describe cyclic and ekpyrotic universes, with an emphasis on open issues and observable signatures.
License of this version: CC BY 4.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2016
Appears in Collections:Fakultät für Mathematik und Physik

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pos. country downloads
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1 image of flag of Germany Germany 143 73.71%
2 image of flag of United States United States 22 11.34%
3 image of flag of China China 13 6.70%
4 image of flag of Hungary Hungary 5 2.58%
5 image of flag of Vietnam Vietnam 2 1.03%
6 image of flag of Indonesia Indonesia 2 1.03%
7 image of flag of Brazil Brazil 2 1.03%
8 image of flag of Taiwan Taiwan 1 0.52%
9 image of flag of Portugal Portugal 1 0.52%
10 image of flag of Netherlands Netherlands 1 0.52%
    other countries 2 1.03%

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