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Large-scale stability and astronomical constraints for coupled dark-energy models
(American Physical SocietyPhysical Review D, 2018-02-26)
The physics of the dark energy and the dark matter is still an open issue in cosmology. The dark energy occupies
about 68.5% of the total energy density of the universe today [1], and is believed to accelerate its observed ...
New integrable models and analytical solutions in f(R) cosmology with an ideal gas
(American Physical SocietyPhysical Review D - Particles, Fields, Gravitation and Cosmology, 2018-01-23)
In the context of f(R)-gravity with a spatially flat FLRW metric containing an ideal fluid, we use the method of invariant transformations to specify families of models which are integrable. We find three families of f(R) ...
Relativistic magnetised perturbations: Magnetic pressure versus magnetic tension
(IoPClassical and Quantum Gravity, 2018-05-16)
We study the linear evolution of magnetised cosmological perturbations in the post-recombination epoch. Using full general relativity and adopting the ideal magnetohydrodynamic approximation, we refine and extend the ...
Inhomogeneous initial data and small-field inflation
(IoPJournal of Cosmology and Astroparticle Physics, 2018-05-08)
We consider the robustness of small-field inflation in the presence of scalar field inhomo- geneities. Previous numerical work has shown that if the scalar potential is flat only over a narrow in- terval, such as in commonly ...