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OATS-UNI/TS SEMINAR
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Speaker: Fabio Fontanot (INAF - OATS)
Title: Semi-analytic Galaxy Formation in Dark Energy Cosmologies
Date: Thursday, October 24th, 2013
Time: 11:30
Venue: Villa Bazzoni
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Abstract We study the implications of different dark energy cosmologies by
coupling high-resolution numerical simulations with updated
semi-analytic modeling (SAM) of galaxy formation and evolution. We
consider both Early Dark Energy (EDE) models (characterized by a
non-vanishing high-redshift contribution of dark energy) and
modifications of the equations of general relativity in the form of
f(R)-gravity models (which imply the existence of a ‘fifth-force’). We
compare the SAM predicted galaxy properties in these cosmologies with
the corresponding quantities obtained for a LCDM universe run on the
same initial conditions. We also compare all results with a reference
set of theoretical predictions obtained with alternative SAMs applied
to the same LCDM simulation, and we show that the modifications in
galaxy properties induced by both EDE and MG cosmologies are of the
same order of magnitude as intra-SAM variations for a standard LCDM
realization. However, when independent information on the underlying
properties of host dark matter haloes is combined with galaxy
properties, like considering galaxy bias or pairwise velocity
distributions, it is possible to disentagle between the different
scenarios: therefore the SAM predictions may still provide important
clues on the expansion history and the equation-of-state evolution.
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Contact: Valentina D'Odorico (INAF-OATS)