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Dark Energy Phenomenology
Martin Kunz, Luca Amendola, Domenico Sapone
We discuss the phenomenology of the dark energy in first order perturbation theory, demonstrating that the dark energy cannot be fully constrained unless the dark matter is found,…
Constraining the growth factor with baryon oscillations
Domenico Sapone, Luca Amendola
The growth factor of linear fluctuations is probably one of the least known quantity in observational cosmology. Here we discuss the constraints that baryon oscillations in galaxy…
Measuring the dark side (with weak lensing)
Luca Amendola, Martin Kunz, Domenico Sapone
We introduce a convenient parametrization of dark energy models that is general enough to include several modified gravity models and generalized forms of dark energy. In particula…
Dark Energy versus Modified Gravity
Martin Kunz, Domenico Sapone
There is now strong observational evidence that the expansion of the universe is accelerating. The standard explanation invokes an unknown "dark energy" component. But such scenari…
Crossing the Phantom Divide
Martin Kunz, Domenico Sapone
We consider fluid perturbations close to the "phantom divide" characterised by p = -rho and discuss the conditions under which divergencies in the perturbations can be avoided. We…
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…