Cosmological perturbations in a family of deformations of general relativity

@article{Krasnov2010CosmologicalPI,
  title={Cosmological perturbations in a family of deformations of general relativity},
  author={Kirill Krasnov and Yuri Shtanov},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2010},
  volume={2010},
  pages={006-006}
}
  • K. Krasnov, Y. Shtanov
  • Published 5 February 2010
  • Physics
  • Journal of Cosmology and Astroparticle Physics
We study linear cosmological perturbations in a previously introduced family of deformations of general relativity characterized by the absence of new degrees of freedom. The homogeneous and isotropic background in this class of theories is unmodified and is described by the usual Friedmann equations. The theory of cosmological perturbations is modified and the relevant deformation parameter has the dimension of length. Gravitational perturbations of the scalar type can be described by a… 
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References

SHOWING 1-10 OF 20 REFERENCES
Modified-source gravity and cosmological structure formation
One way to account for the acceleration of the universe is to modify general relativity, rather than introducing dark energy. Typically, such modifications introduce new degrees of freedom. It is…
HALOS OF MODIFIED GRAVITY
We describe how a certain simple modification of general relativity, in which the local cosmological constant is allowed to depend on the space–time curvature, predicts the existence of halos of…
Consistent cosmological modifications to the Einstein equations
General relativity is a phenomenologically successful theory that rests on firm foundations, but has not been tested on cosmological scales. The deep mystery of dark energy (and possibly even the…
Motion of a 'small body' in nonmetric gravity
We describe 'small bodies' in a nonmetric gravity theory previously studied by this author. The main dynamical field of the theory is a certain triple of 2-forms rather than the metric, with only the…
Non-metric gravity: II. Spherically symmetric solution, missing mass and redshifts of quasars
We continue the study of the non-metric theory of gravity introduced by Krasnov (2006 Preprint hep-th/0611182) and obtain its general spherically symmetric vacuum solution. It respects the analog of…
Effective metric Lagrangians from an underlying theory with two propagating degrees of freedom
We describe an infinite-parametric class of effective metric Lagrangians that arise from an underlying theory with two propagating degrees of freedom. The Lagrangians start with the Einstein-Hilbert…
Deformations of the constraint algebra of Ashtekar's Hamiltonian formulation of general relativity.
We show that the constraint algebra of Ashtekar's Hamiltonian formulation of general relativity can be nontrivially deformed by allowing the cosmological constant to become an arbitrary function of…
Renormalizable Non-Metric Quantum Gravity?
We argue that four-dimensional quantum gravity may be essentially renormalizable if one relaxes the assumption of metricity of the theory. We work with Plebanski formulation of general relativity in…
The cosmological constants
Dark matter substructure and dwarf galactic satellites
A decade ago cosmological simulations of increasingly higher resolution were used to demonstrate that virialized regions of Cold Dark Matter (CDM) halos are filled with a multitude of dense,…
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