Suppression of Meszaros' Effect in coupled DE (2007)
Bonometto, Silvio, Mainini, Roberto
A phaenomenological DM-DE coupling could indicate their common origin. Various constraint however exist to such coupling; here we outline that it can suppress Meszaros' effect, yielding transfered...
Roberto, Mainini, Bonometto, Silvio
The dual axion model (DAM), yielding bot DM and DE form a PQ-like scalar field solving the strong CP problem, is known to allow a fair fit of CMB data. Recently, however, it was shown that its...
Limits on coupling between dark components (2007)
Mainini, Roberto, Bonometto, Silvio
DM--DE coupling can be a phenomenological indication of a common origin of the dark cosmic components. In this work we outline a new constraint to coupled--DE models: the coupling can partially or...
Dark Matter, Dark Energy and the solution of the strong CP problem (2006)
Mainini, Roberto, Colombo, Loris, Bonometto, Silvio
The strong CP problem was solved by Peccei & Quinn by introducing axions, a viable candidate for Dark Matter (DM). Here the PQ approach is modified so to yield also Dark Energy (DE). DM and DE arise,...
Mass functions in coupled Dark Energy models (2006)
Mainini, Roberto, Bonometto, Silvio
We evaluate the mass function of virialized halos, by using Press & Schechter (PS) and/or Steth & Tormen (ST) expressions, for cosmologies where Dark Energy (DE) is due to a scalar self-interacting...
Likelihood distribution for models with cosmological constant from COBE data (2001)
Tucci, Marco, Contaldo, Angela, Bonometto, Silvio
Using COBE-DMR 4-year data, we find a general expression yielding the likelihood distribution in the 3-dimensional parameter space spanned by the spectral index $n$, the spectral amplitude $a_{10}$...
Large-Scale Structure in Mixed Dark Matter Models with a Non-thermal Volatile Component (1996)
Pierpaoli, Elena, Coles, Peter, Bonometto, Silvio, Borgani, Stefano
We investigate the properties of large--scale structure predicted in a class of mixed dark matter models in which the volatile component (made of particles with high rms velocity) derives from the...