Neutrino Dark Energy -- Revisiting the Stability Issue (2007)
Bjaelde, Ole Eggers, Brookfield, Anthony W., Van De Bruck, Carsten, Hannestad, Steen, Mota, David F., Schrempp, Lily, ...
A coupling between a light scalar field and neutrinos has been widely discussed as a mechanism for linking (time varying) neutrino masses and the present energy density and equation of state of dark...
Tocchini-Valentini, Domenico, Hoffman, Yehuda, Silk, Joseph
We extend to large scales a method proposed in previous work that reconstructs non-parametrically the primordial power spectrum from cosmic microwave background data at high resolution. The...
A new search for features in the primordial power spectrum (2004)
Tocchini-Valentini, Domenico, Douspis, Marian, Silk, Joseph
We develop a new approach toward a high resolution non-parametric reconstruction of the primordial power spectrum using WMAP cosmic microwave background temperature anisotropies that we confront with...
Using bright ellipticals as dark energy cosmic clocks (2003)
Ferreras, Ignacio, Melchiorri, Alessandro, Tocchini-Valentini, Domenico
The age of the Universe has been increasingly constrained by different techniques such as the observations of type Ia supernovae at high redshift or dating the stellar populations of globular...
The nature of dark energy (2002)
Amendola,Luca, Quercellini,Claudia, Tocchini-Valentini,Domenico, Pasqui,Alessandro
According to a variety of cosmological observations at small and large redshifts, the universe is composed by a large fraction of a weakly clustered component with negative pressure, called dark...
Perturbations growth and bias during acceleration (2002)
Amendola, Luca, Tocchini-Valentini, Domenico
In most models of dark energy the structure formation stops when the accelerated expansion begins. In contrast, we show that the coupling of dark energy to dark matter may induce the growth of...
Amendola, Luca, Quercellini, Claudia, Tocchini-Valentini, Domenico, Pasqui, Alessandro
It is well-known that even high quality cosmic microwave background (CMB) observations are not sufficient on their own to determine the equation of state of the dark energy, due to the effect of the...
Baryon bias and structure formation in an accelerating universe (2001)
Amendola, Luca, Tocchini-Valentini, Domenico
In most models of dark energy the structure formation stops when the accelerated expansion begins. In contrast, we show that the coupling of dark energy to dark matter may induce the growth of...
Tocchini-Valentini, Domenico, Amendola, Luca
We show that all cosmological models with an accelerated stationary global attractor reduce asymptotically to a dark energy field with an exponential potential coupled linearly to a perfect fluid...
Stationary dark energy: the present universe as a global attractor (2000)
Amendola, Luca, Tocchini-Valentini, Domenico
We propose a cosmological model that makes a significant step toward solving the coincidence problem of the near similarity at the present of the dark energy and dark matter components. Our cosmology...