Voids and overdensities of coupled Dark Energy (2009)
We investigate the clustering properties of dynamical Dark Energy even in association of a possible coupling between Dark Energy and Dark Matter. We find that within matter inhomogeneities, Dark...
Scalar field-perfect fluid correspondence and nonlinear perturbation equations (2008)
The properties of dynamical Dark Energy (DE) and, in particular, the possibility that it can form or contribute to stable inhomogeneities, have been widely debated in recent literature, also in...
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...
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...
Cosmologies with dynamical and coupled Dark Energy vs. CMB data (2006)
Bonometto, Silvio A., Casarini, Luciano, Colombo, Loris P. L., Mainini, Roberto
We compare a large set of cosmologies with WMAP data, performing a fit based on a MCMC algorithm. Besides of LCDM models, we take dynamical DE models, where DE and DM are uncoupled or coupled, both...
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...
Dark Matter-baryon segregation in the non-linear evolution of coupled Dark Energy model (2005)
The growth and virialization of spherical top-hat fluctuations, in coupled Dark Energy models, causes segregation between Dark Matter (DM) and baryons, as the gravitational infall into the potential...
Dark Matter and Dark Energy from a single scalar field (2005)
Mainini, Roberto, Colombo, Loris, Bonometto, Silvio A.
The strong CP problem was solved by Peccei & Quinn by introducing axions, which are a viable candidate for DM. Here the PQ approach is modified so to yield also Dark Energy (DE), which arises in fair...
Dark Matter and Dark Energy from a single scalar field and CMB data (2005)
Mainini, Roberto, Colombo, Loris P. L., Bonometto, Silvio A.
Axions are likely to be the Dark Matter (DM) that cosmological data require. They arise in the Peccei Quinn solution of the strong CP problem. In a previous work we showed that their model has a...
Dark Matter and Dark Energy from the solution of the strong CP problem (2004)
Mainini, Roberto, Bonometto, Silvio A.
The Peccei Quinn (PQ) solution of the strong CP problem requires the existence of axions, which are a viable candidate for Dark Matter. Here we show that, if the Nambu Goldstone potential of the PQ...
N-body simulations for coupled dark energy: halo mass function and density profiles (2003)
Maccio', Andrea V., Quercellini, Claudia, Mainini, Roberto, Amendola, Luca, Bonometto, Silvio A.
We present the results of a series of N-body simulations in cosmologies where dark matter (DM) is coupled to dark energy (DE), so easing the cosmic coincidence problem. The dark-dark coupling...