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Large-scale instability in interacting dark energy and dark matter fluids
Jussi Valiviita, Elisabetta Majerotto, Roy Maartens
If dark energy interacts with dark matter, this gives a new approach to the coincidence problem. But interacting dark energy models can suffer from pathologies. We consider the cas…
Cosmological constraints combining H(z), CMB shift and SNIa observational data
Ruth Lazkoz, Elisabetta Majerotto
Recently H(z) data obtained from differential ages of galaxies have been proposed as a new geometrical probe of dark energy. In this paper we use those data, combined with other ba…
Measuring deviations from a cosmological constant: a field-space parameterization
Robert Crittenden, Elisabetta Majerotto, Federico Piazza
Most parameterizations of the dark energy equation of state do not reflect realistic underlying physical models. Here, we develop a relatively simple description of dark energy bas…
Observational constraints on phantom-like braneworld cosmologies
Ruth Lazkoz, Roy Maartens, Elisabetta Majerotto
We investigate a simple braneworld model in which the universe contains only cold dark matter and a cosmological constant, but the effective dark energy is phantom-like because of…
Observational constraints on self-accelerating cosmology
Roy Maartens, Elisabetta Majerotto
The DGP brane-world model provides a simple alternative to the standard LCDM cosmology, with the same number of parameters. There is no dark energy - the late universe self-acceler…
Supernovae type Ia data favour coupled phantom energy
Elisabetta Majerotto, Domenico Sapone, Luca Amendola
We estimate the constraints that the recent high-redshift sample of supernovae type Ia put on a phenomenological interaction between dark energy and dark matter. The interaction ca…