Fingerprinting dark energy (2009)
Sapone, Domenico, Kunz, Martin
Dark energy perturbations are normally either neglected or else included in a purely numerical way, obscuring their dependence on underlying parameters like the equation of state or the sound speed....
Constraints on early dark energy from CMB lensing and weak lensing tomography (2009)
Hollenstein, Lukas, Sapone, Domenico, Crittenden, Robert, Schaefer, Bjoern Malte
Dark energy can be studied by its influence on the expansion of the Universe as well as on the growth history of the large-scale structure. In this paper, we follow the growth of the cosmic density...
Dark Energy Phenomenology (2008)
Kunz, Martin, Amendola, Luca, Sapone, Domenico
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, and that there are...
Constraining the growth factor with baryon oscillations (2007)
Sapone, Domenico, Amendola, Luca
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 power spectra from...
Measuring the dark side (with weak lensing) (2007)
Amendola, Luca, Kunz, Martin, Sapone, Domenico
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 particular we take into...
Dark Energy versus Modified Gravity (2006)
Kunz, Martin, Sapone, Domenico
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 scenarios are faced with...
Crossing the Phantom Divide (2006)
Kunz, Martin, Sapone, Domenico
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 find that the...
Supernovae type Ia data favour coupled phantom energy (2004)
Majerotto, Elisabetta, Sapone, Domenico, Amendola, Luca
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 can be interpreted as...