6533b828fe1ef96bd128799f
RESEARCH PRODUCT
Cosmological Perturbations in Renormalization Group Derived Cosmologies
Martin ReuterAlfio Bonannosubject
PhysicsHigh Energy Physics - TheoryIsotropyAstrophysics (astro-ph)FOS: Physical sciencesAstronomy and AstrophysicsPerfect fluidCosmological constantAstrophysicsGeneral Relativity and Quantum Cosmology (gr-qc)Astrophysics::Cosmology and Extragalactic AstrophysicsFixed pointRenormalization groupAstrophysicsGeneral Relativity and Quantum CosmologyHigh Energy Physics - Theory (hep-th)Space and Planetary ScienceHomogeneousCosmological perturbation theoryCovariant transformationMathematical PhysicsMathematical physicsdescription
A linear cosmological perturbation theory of an almost homogeneous and isotropic perfect fluid Universe with dynamically evolving Newton constant $G$ and cosmological constant $\Lambda$ is presented. A gauge-invariant formalism is developed by means of the covariant approach, and the acoustic propagation equations governing the evolution of the comoving fractional spatial gradients of the matter density, $G$, and $\Lambda$ are thus obtained. Explicit solutions are discussed in cosmologies where both $G$ and $\Lambda$ vary according to renormalization group equations in the vicinity of a fixed point.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2002-10-21 |