Relazione Anno 2009 - Dipartimento di Fisica G. Occhialini - Infn

Relazione Dipartimento di Fisica “G. Occhialini”, anno 2009
Alberto; O'Dwyer, Ian; Olinto, Angela; Pagano, Luca; Pajer, Enrico; Partridge,
Bruce; Pearson, Timothy; Peiris, Hiranya; Peloso, Marco; Piacentini, Francesco;
Piat, Michel; Piccirillo, Lucio; Pierpaoli, Elena; Pietrobon, Davide; Pisano,
Giampaolo; Pogosian, Levon; Pogosyan, Dmitri; Ponthieu, Nicolas; Popa, Lucia;
Pryke, Clement; Raeth, Christoph; Ray, Subharthi; Reichardt, Christian; Ricciardi,
Sara; Richards, Paul; Riotto, Antonio; Rocha, Graca; Ruhl, John; Rusholme,
Benjamin; Scherrer, Robert; Scoccola, Claudia; Scott, Douglas; Sealfon, Carolyn;
Sefusatti, Emiliano; Sehgal, Neelima; Seiffert, Michael; Serra, Paolo; Shandera,
Sarah; Shimon, Meir; Shirron, Peter; Sievers, Jonathan; Silk, Joe; Sigurdson, Kris;
Silverberg, Robert; Silverstein, Eva; Staggs, Suzanne; Starkman, Glenn; Stebbins,
Albert; Stivoli, Federico; Stompor, Radek; Sugiyama, Naoshi; Swetz, Daniel;
Tartari, Andrea; Tegmark, Max; Timbie, Peter; Titov, Maxim; Tristram, Matthieu;
Trodden, Mark; Tucker, Gregory; Urrestilla, Jon; Veneziani, Marcella; Verde, Licia;
Vieira, Joaquin; Walker, Terry; Wands, David; Watson, Scott; Weinberg, Steven;
Weiss, Rainer; Wandelt, Benjamin; Winstein, Bruce; Wollack, Edward; Wyman,
Mark; Yadav, Amit; Won Yoon, Ki; Zahn, Olivier; Zaldarriage, Mattias; Zemcov,
Michael; Zwart, Jonathan
Astro2010: The Astronomy and Astrophysics Decadal Survey, Science White Papers,
no. 67
Personale
S. Bonometto
G. La Vacca
Cosmologia e fisica dei neutrini
During 2009, our work was focused on two basic questions:
(i) The quest for the nature of the dark cosmic components.
(ii) (ii) How to constrain neutrino physics by using astrophysical inputs.
This research made also recourse to fitting techniques and to N-body simulations. A
significant part of it was aimed to prepare tools to use week lensing tomographic data
which promise to be the best approach to probe the properties of Dark Energy,
providing reliable data on its state equation and on possible energy flows between the
dark components. These ideas are part of the project EUCLID, to whose preparation
we contribute.
Within this context we deepened the spectral equivalence criterion, enabling one to
find the spectra of any cosmology with arbitrary DE state equation w(z), at any z, by
using suitable, z-dependent, auxiliary models with w=const. The criterion was tested
also in the hydrodynamical range, by performing the first hydro simulations of
dynamical DE models. The efficiency of this technique also outlines a severe
experimental danger. In fact, if forthcoming tomographic data are fitted assuming
w=const, and one finds different "constant" w's for different redshift ranges, the
function w(z) so found IS NOT the variable DE state equation and, as we showed, is
quite far from it.
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