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OATS-UNI/TS SEMINAR
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Speaker: Silvio Bonometto (OATS)

Title: Spiced LWDM. Meeting all cosmological tastes?
Date: Wednesday, April 30th, 2014
Time: 11:30
Venue: Villa Bazzoni
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Abstract In the early Universe, a dual component made of coupled CDM and a scalar field, if their coupling \beta > \sqrt{3}/2, owns an attractor solution, making them a stationary fraction of cosmic energy during the radiation dominated era. Along the attractor, such components have early density parameters 1/(4\beta^2) and 1/(2\beta^2) (field and CDM, respectively). If a further component breaks such stationary expansion at z~3-5*10^3, cosmic components gradually acquire densities consistent with observations. An appealing possibility is that this extra component is warm. We performed a full linear analysis of this class of models and found that, for large \beta values, corresponding at a present coupled-CDM density parameter ~10^-3 (a pinch of dark pepper), CMB spectra are strictly similar to LCDM, while the transfer function own features significantly easing long standing questions, as Milky Way substructures, dwarf rotation curves, small galaxies in voids; simultaneously the fit to Ly\alpha and other observables is also promising.
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Contact: Silvio Bonometto (OATS)