Trobada: Clustering GCG: a viable option for unified dark matter-dark energy?

por Anjan Ananda Sen (Center For Theoretical Physics Jamia Millia University, New Delhi, India)

miércoles 10 jun. 2015 15:00 → 16:00 Europe/Madrid

IFIC

I shall discuss about the Clustering Generalized Chaplygin Gas (CGCG) as a possible candidate for dark matter-dark energy unification. The vanishing speed of sound ($c_{s}^2 = 0$) for the GCG fluid is obtained by incorporating higher derivative operator in the original K-essence Lagrangian. The evolution of the density fluctuations in the GCG+Baryon fluid in the linear regime will be discussed. Subsequently the results from the observational constraints on the model using latest data from SNIa, $H(z)$, BAO and also from the $f\sigma_{8}$ measurements will be presented. The matter power spectra for the allowed parameter values will be shown to be well behaved without any unphysical features.